HOMESTAKE V-..:J·'>k · · · · David'W. · • Trust our Peo(lle. trusi: our Data ...Bilii~~s)iT 800.735.4489 •· Casper; WY 888.235.0.515 . Gillette, WY Ba&.686;7175 • Helena,

'~"'""''" ''' ... ~:.:"' ..

HOMESTAKE ... .. . . . . V-..:J·"'>k .... .. ~v.

"' ..... .. .

Homestake 1vl~iµg Cbriipany: of C:alifomia

· · · · David'W. Pierce . . . · ·: : :Grants Project · · : : : : ; j:: :C.losure Managei; · '.::

·::.·.3.0:July 2019

Document :c0nlrol Desk ... U.:S·. Nuclear:ReglJlatow Conimfssion . : · Washington, DC 2055~0001 ,. ,., .... ,. .. ''' ......

Ron Linton::· .. . . . . . . . : •.. Projec;t Maiiager/Hydrogeologist .

: U;s• .. NRC . . .. . : Ottibe of Nuc!~ar Materiai Safety· 11r:id S~fEi,gJards : ·.:. · .

MS T-5A 10, ft545 Rockville Pike:.· . : : · Rqc~Ville, MD 20852 · . · · . . . . . . .

.. . . .. . .. RE: Supplem.~tital Corrected. Information to the Homestake Mining Company of C~U.{ornia

· · · · · · - Grants Reclamation Project - Semi-Annual Environmental: Monitoring Report for ..... : :period July~De.cE:jn,ber 201 a, Dopk"~ :No. 04o-oseo~~ 1:.i.cense No. suA.-1471

Dear Mr: Linton: . . . .

: Pl:ease find attached coiiected data forthe:r.eferenced report above. The analytical data in : Attaciiin~nt 1: ·(High Volu'rr1E) ·Air S<1mpling Results) W~S rep6rted ~sing: the Vvrohg units for ..... Uranium, c:ausing the results to below by a fact0r: ofl,000. A cor:rected•copy of the analytical rep()rt·is"attachedwith :the correct Linits~:.P.l~aiie replace the a:nalytical report frorrlthe. . ' . ref~ret1cE,d?. sub111itteo re·port ~ith th~: or:i.E;3 :atta~hE:ld. to thi~ l~ttei\ . · · · · ·

.. MMC _a,pologizes fqr the inconvenlen9e ... If you: haver any_ qLJestiqris.concerning this letter: ohhE? attached data tables., please contacf me via e-mail at dpierce@'homestakemir:iin:gc"oca.com or· via teiephone.at.505.238'.9701. ',' .. ,,, . ,, ... . .. . '' . : .. ::: .

·: R~spectfully, .· .... . ... . .. R .... . ·; ?'<: ,;,;I} ( 1 -,;,.,::o_,,;•:: ,·:::; ~~:~~,:~"'-

• David W. Pierce . c(cisurii Manager . . . . ....

Homestake; Mining CqmpaiJ.y'ofCalifqrnia Office: 505.~87:4456.X:~4 J Cell: 505.238:9701 ·

.......

·. Copy.To:

M. McCar.thy, Si;trrlck, Salt Lake ¢ityJ)t~h ·(electronic copy):., .. G. George, Davis;Wright and Tremaine;:san Francisco, California (electronic copy) • • ·

. : : · c: Burton;. Barrick, Henderson, Nevada ( electronic copy) . . . . . . . . . . . . . .. : : RJNtiic:ker, Environnien@ R~1;1.toration Group, A!l:>aqµ~rque, New ME:lxiQo :(~!Elctronic copy) :

. attachment

Homestake Miping: Qompimy F'.O, a11x:98; :Grants. NM 87020 · Tele: (505) 287:-445!1. : ·: : .. Fax: (505) 287:-.928~:::

. ... ..

.. ...

. • Trust our Peo(lle. trusi: our Data ... Bilii~~s)iT 800.735.4489 •· Casper; WY 888.235.0.515 . Gillette, WY Ba&.686;7175 • Helena, MT 87,7.412.D)h:

May 17; 2019:::

Homestake Mining Co

Hwy 605 · ....• Grants, NM 87020 .

W\'iW'.ener~yJi,!icom

ANALYTICAL SUMMARY REPORT ., .. , ,. . . - ' ...

Work Order: C19010089 · Quote ID: C5150 . ·

. Project Name: Grants

.. :Energy Laboratories; Inc: Casper WY received the following 8 samples for Hqmestake Mining to on 1/4/2019 for analysi's. ' . . ' . . . - .

Lab ID • · • Client Sample ID

·: .C19010089-001 : HMC~f:

C1901Q08!:>-Q02. HMC-1A ..

. . C1.9010089-003 HMC~2 .

'c:19010089-004 • 1-iMC:>3

... C1.90.10089~005 . HMC-4

C19010089:oo7 HMC-6

. : C19010089-008 HMC~?::

Date . Receive Date Matrix . Test ·

01/04119

: : . 01/04/19

01/04/19:·

Filter : Metals by ICP/ICPMS; Total . Composite of two or·more·samples ·. ·

Client Provided Field Parameters · Metals, T6fa1:· · · Djgestion, Total M~tal.s Digestion, Total Metals; Radioc;tiemistfY . . .. Radiochemistry Air Filter Compliance::

· C1:1!culatioris . . . :: RAD-AIR, Routine Radiological

Repcirts · · · · · ·

RAD Alternate:Unit Reporting.Air . Filters · • · · · · · · · · · ·

Radium 226 Thorium, hmtopic ·

• Filter Same As Abo1.1e .

Filter · .Same As Above

01/04/19: Filter · Saine As Above

· · • . 01/04/19 ···Filter Same As Above. . '". ""

o;1 /Q4/19 • Filter . Same As Above

The analyses presented in this report were performed by Er'.lergy Laboratories, Inc., 2393 Salt Creek Hwy:, Casper, · ·· WY 82601, µnless otherwise noted .. Any exceptions or pr9blems with the analyses are: noted in thelab9rafory

· · Analytical Report, the QA/QC Summary Rep'6it,:or the Case Narrative.· Any issues encountered• during sample: ·: re:~ipt are documente~ (n=the Work Order: Rioef pt Checklist. . . . . . .. .. .

... ..... .

.. The results• as reported relate only to the item(s) submitted for testing. This report shall be used or copied· only :in its .. : entirety. Energy Laboratories, Inc. is not responsible for the consequences arising from the use of a partial report. :

If you have any questions regarding these test results.,· please_ contact your Project Manager .

Report Approved By:

. Digitally sigi1ed by · Tracey Archer

Date: 2019:05..17 12:48:07-06:00·

Page 1 of24

: Trust our Peopl~: TrJsto~i o.ita. . . ~~:enei-9¥.lab.com ·

... ,. · , Jlilliniis; ~T.8DD.7_35.,4B9·•:Casper;wv.eea.2as.~s1s · El\ERGY.

1:.Al!!OR,I\TOR11".!$ Gillette, VfY 8_~6.686.1175 • Helena, MT_877;472;07t 1

. : CU.ENT: . Proji:ict:. .

Work C>rder:

:Homestake Mining co: . Grants·

C19010089

... ' . ·: :REVISED/SUPPLEMENTAL REPORT

'Revised 0511112019 · .. . . ....

Revise.d. Date: 05/17 /1 !;I ... ... '

· Report 'o.ate: __ 02/_11/19 .

. :.:CASE NARRATIVE

'' ., ... Per reqi.Je$t:ftoni Chuck Farr oh 05114i2019, .check .Liianitirtl peir filter [l9SU1ts on' ~a:nipiesHMC,1A {002A)( HMC-2 (003A).: .. : .

HMC;>3 (004A). Hl\tlC.-4 (b05A), HMC-5 (Q06A) a11d HMC-6 (0071:\). : .. : · . . . · · ·-· .... ,

At re-r~view. qffhe data it was:uncQV.E!fed that there was ~n fosue present in flie :ur!:inh.im data reported fodhe above samples. The volume listed on the coc was used iri :the:pr.e{>aration batch fo(the: samples in Liters, r'ather:than being

. ·CQnvertei:t to L from mt as it :is recorded· on the ·coc. Ourlng a departmental revfew of the ractiqchemistiy data the p~ep • : ·: :volume was corrected to :Liters (based on• historical submittals). • However, data reported bY: tHe Metals team prior to that . · . correction refleeted the original volumes (ml); ·causing the UraAium results to be low by a·fa:6tor of 1,000. The Vanadium

data w~s riot affected by this iss~e. : · · 1:. . ·.. . . . : . . . . . . . . . .

. • Tf:ie.corrected Ura hi um an!:!lysis results wm be reported. We apologize fpr any inconve1\ier1cejthis may have ca.used.: ·•The report_ has been.revised•an_d_ replaces any:previousltissued report•in its ~ntkety .. ·

.. ... . ....

.. .. .

Page2 ot2:4

------------'-'~'='=£!!:"::~_.'= __ ·_:;=~,,., N •• Trust our People. Trusfour Data: ~ l'IVIW:enermilah.com ·

E~RGY LABORArrORlES -

iiiliings; MT 800.7_35A_489 • Casper, WY 888;235:0515 . Gillette, WY 866.686_.7175 • Helena, MU77:472'.0711

LABQRA TORY ANALYTICAL REPORT• ·· - · - ·· · · · ·•_R __ e_v_i_s_e_ d Date: 05/1_7/1_9_ .. ·. :

Client: . H6mestake Mining Co: .. -· · Prepared by Casper, WY Bra_nch

Report Date: 02/11/19

P · t· Grints .roJeC :

Lab ID: C19010089~001

. ClientSari:ipI~ID: HMC-1 ...

Analys~s.:

_: METALS, TOTAL: Vanadium

METALS, IN AIR • -•. . : . _Uranium

Uranium, Activity

• RADIONUCLIDE$ - IN AlR · • • · • • · Radium 226

Radium 226 precision (±)

Radium 226 MDC

· Thorium 230

: . Thorium 230. precision.(±)

Thorium 230 MDC

Result : .Unit~ ·:

· <0.10 · · · mg/filter.

<1:5f-10 mg/L

<1.0E-16 -uCi/mL· -

1.6E_:r7 uCi/mL

6.9E-18 uCi/111L > 6_8E-18 LiCi/rtil :

3.4E-18 - uCi/mL

-- 1 AE-18 • uCi/mL

1.6E-18 uCi/mL. · ·

. : RADIONUCLIDES - IN AIR - PER FILTER · · · · Radium .226 2.3 · · · pCi/Filter .

Radium 2:26 precision (±)

Radium 226 MDC.

•::._Thorium 230

Thorium 230-precisiori (±Y Thorium 23.0.MDC

· · · ·. Uraniu·m, Activity

1.0 pCi/_F.ilter : : .

1.0 . . pCi/F1lter

Q.52.: .• pCi/Filter

· 0.22 · pCi/Filter .

0.24 pCi/Filter: •: .

· 6.9 · : : pCi/Filter

RADIOCHEMISTRYAiR FILTER COMPLIANCE Radium 226, % of EFF

. : .. : Radium 226, EFFWeek

: · •: _Radium 226, LLD :

Thorium :230, % of EFF

Ttiodurn 230; EFF Year

· · Thorium 230, ~LO · : : · .Uranium Natural, % .ofEFF

Uranium Natural, EFF Year· ' . . . . . .

Uranium Natural, LLD

2.0E-03 % -: 9.0E-.13 . _ uCi/mL

: 1.0E-16 : uCi/mL

1.0E-02 % 3.0E-14 uCi/mL:

1.i:iE~16 : uCi/mL

.. 5.QE-02 %

9.0E-14 LiCi/mL ·

1.0E-16 uCi/mL

.. CLiENT PROVIDED FiELb PARAMETERS : Air Filtering Volume 1.51 E+8 l:

Report : · R_L~ Analyte ·reporting limit. .. · Definitions: : : QCL - Quality control Hn,if:.:

. . MDC~: Minim_urn detectabie conyentratiori. ·.

Qual -MCL/

Collection D~te: Not Provided

DateReceived: 01/04/19 . ·

Matrix: Filter

• RL · Q('.L Method: . Analysis Date/ :Sy .

0.10

1.5E-10

1.0E-16

.0.20

SW6020. 02/07/19 16:57 / jcg ·

S\/\166:zo 02/05/1 ~ 15:1_ o I jcg

SW6020 • · · : 02/05/19 15: 10 /jcg

: .. E903;0:

E903.0

E903.0

E908:0

E9Ci8:o.

E908.0

RADCALC.

01 i22h 9_ 1f31 / nsr

.. 01/22/19 17:31 (nsi .

: • 0:1122119 17:31 Inst ·

02/.06/19 06:50 I arh

02/06/19 06:50 / arh

- 02/06/19 06:50 i _arh ·

02/08/19 14:43 / sec.

RADCALC · · : : 02/08/19 14:43 / sec· -RADCALC · .... 02/08/19 14:43 /sec• .

.RADCALC

RADCALC

RADCALC RADCALC.

· 02(08/19 14_:43 / sec

02/08/19 14:43 /sec

: · : :02/08/19 14:43 / set ·

02/08/19 15:07 / sec· -

RADCALC .. ·•02/08/19 14:44 /sec:. • ... RADCALC 02/08/19 ·14:44 / sec

RADCALC 02/08/19 14:44 I sec

RADCALC 02/08/19 14:44 /sec

RADCALC . 02/08/1914:44isec :· -

. . . RADGALC 02i6ai19 1.4.:44 / sec

RADCALC 02/08/19 15:22 / sec

RADCALC : . ·02/08/19 14:44 /sec.. : RADCALC .. - . 02/08/19 14:44 {sec·: : .

FIELD 12/31/18 00:00 /***: .

. Mel·- Maximum contaminant level.··

ND - Not detected at the reporting limit..:: .

Page 3 of24

EI\ERG\' LABORATOR!.ES

.... Trust our People. Trust our Data'.· www.energyiab.com ..

· Toll.Free: 888;2?.5.0515 ... 307.235.0515 ° HD? :234: 1639

:•'• ···,·.· ·.· · · ·, : ... : . : . . .. HIGH VOLUME A)]{ SA,MPLING REPORT .. ·;·.. . . . ·-- .. .. . . . . . . . . . . .

· · . . CLIENT: ·Homestake Mining Co ~ Grau.ts .

':; :::· \y~ROJECT: G(~nts:: i:{: . . · 'REPORJ.DA1:E: May 17i2019: ...

: : Quarterillate Sample~ : : : · - Air Volume

Cl9010089°001 :

Fourth Quarter 2018 . ·

.. Ai.rV9lµmein:mLs · ·

Radionuclide .

··:.natu:· 23°Th

.. 226Ra .

: ·concentration µCi/Iru, .

·:5.E0 .J7:· 3E-18

2E~17

: : C.ounting · . : Precision:

µCi/mL NIA

lE-18 ·

7E-18 --

. ..... .. ..

. ... , . .. ..

i;.L.D.+ Effluent Ciinc'.* l\1DC µCi/mL --

µCiimL yCi/mL·

•::NIA: lE-16: : · •9E-14

2E-18 : !E~l6 3E-14 ..

7.E~l.8 : 1E:}6 9Ecl3.

. . . . . . . . . . . .

% Effluent Concentration

· 5E~02 :·

lE-02

~E-03 1---------'-------'-------'------.J'------..__ ____ -.J'-------' .. l.51E+l 1

+LLD's are from NRC Reg. Guide 4J4.: · ·

· · · · -· *Effluent Concentration from the. NEW 10 CFR Part 20 -Appendix B -· Table 2 ·

: : : Y·earfor Natural Uranium:: .. ... . .... . ..

Year forThorium~230

Week for Radium-'226

. Da:y:for Lead-210

Page4 6f2~

Trust our.People. Trusfour Data, viww:enerrzylah.com

Biliings; MTB00.7_35;4489 o Casper, Vrf:888:235~~515 Gillette, WY 866:.686}175 • Helena, Ml:877:472'.0711

J,,A13QMTORY ANAL t'n<;:AL REPORT .. • ••. Ptepared by Caspet, WY Branch llevi_sed Date: 05/17/.19 :

Clienti.. . Hom:estake Mining Co. P · t· Gran· t·s . roJec : ·

Lab ID: CI9010089~002.

ClienfSaniple ID: HMC-1.A

-MCL/

Report Date:· Oi/11119

Collection D~te: Not Provided

Date Received: 01/04/19 . • ·

· Matrix: Filter·

Analyses: Result : UQit~ Qual . RL · Q(:::i:., Method · : • Analysis Date/ By .•

·: METALS, TOTAL:• Vanadium.

· · MEJALS, IN AIR : Uranium

·uranium; Activity·

.RADIONUCLIDE~:.: IN AIR: . . · ··.Radium 226

R.adium 226 precision (±)

Radilim 226 MDC

Thorium 230

. Th_orium 230 precision (±)

Thorium 230·MDC

· <0.10 · mg/filter -

<1.5_E:.10 . mg/L

.<1.0E~16. uCi/rrtL

· 3:2E-17 uCi/mL

1.0E-17 uCi/mL:

6.8E-18 LiCi/rill : .

4.4E~18 · uCi/mL

rnE-18 uCi/mL

2.6E-18 uCi/rnL · ·

. : -RADIONUCLIDES - IN AIR ~ PER FILTER · · · · Radium 226 . ·4:6 · pCi/Filter .

Radiu.m 226. precision (±)

. Radium 226 M_DC .

: .. Thorium 230 • : .. Thorium 230 precision (±f

Thorium 230.MDC

. Uranium; Acfivity · ·

1.5 pCi/Filter . 1.0 . . . pCi/Fflter · ·

0.64 .• :. pCi/Filter

0.28

0.38 . . . 4.7.

pCi/Filter -

pCi/FilteJ :

: pCi/Filter

RA.DIOCHEMISTRY AiR FILTER COMPLIANCE Radium 226,:% of EFF 4.0E-03 % :

. • · Radium 226, EFF Week· · 9:oE-.13 . uCi/mL

· • •: Radium 226, LLD: : 1;0E~16 uCi/mL

Thorium 230; % of EFF 1.0E-02 % Thorium 230; EFF Year 3.0E-14 uCi/mL: ·

· · · Thorium 230, ~Lei : • · · {QE-16 -uCi/mL

··•Uranium Natural, % ofEFF 4:0E-.02- % Uranium Natural, EFF Year:· 9.0E-14 LiCi/mL

Uranium Natural, ~LD 1.0E-16 tiCi/riiL ·

·:d,jENT PROVIDEDFiELtfPARAMETERS :· Air Filtering Volume 1.46E+8 L

Report · · _R_l - Analyte reporting limit..

Definitions: . . qeL - Quality confrol li_n1it : •

. MDC .: Minim.urn petectable concentratio.n :

0.10

.. HiE-10

1.0E-16

·.0.20

· sw6020 .·

s\i\/60:zo

SW6020 ·

E_903:o:

E903.0

E903.0

E908:0 ·

·: . E9o8:o•

E908.0

. · RADCALC.

RADCALC

RADCALC ·

~DCALC

AADCALC

RADCALC RADCALC.

RADCALC

RADCALC

RADCALC

RADCALC

RADCALC

RADQALC

RADGALC

RADCALC

RADCALC

FIELD

02i05/1 ~ 15:29 I jcg

:OZ/05/19 15:29 /'jcg ·

01J22h9. 17:31 / nsr

..... 01/22/19 17:31 (nsc. :

· 01/22/19 17:31 / nsr

02/06/19 06:50 / arh

02/06/19 06:50 / arh

. 02/06/19 06:50 i arh.

.02/08/19 14:43 / sec

· . 02/08/19 14:43 / sec ,,... . . 02/08/191_4:43 /sec.

02/08/1914:43/sec

02/08/19 14:43 /sec

.:::02/08/1914:43 /sec·

05/16/1914:26 /sec.

· 02/08/19 14:44 rsec ·

02/08/19 14:44 / sec

02/08/19 14:44 / sec

: . 02/08/19 14:44 isec . . . '

•02/08/1914:44 isec .

02ioah Q 14.:44 / sec

05hEV1914:31 / sec

: . : 05/16/1914:31 /sec.

. · : 05/16/1914:31 /sec .

. : :12/31/18 00:00 /***

. MCL - Maximum contaminant level. ·

ND - Not deitected_ at the reporting lirn_it. •

Pages of 2~

m.r EI\E.R6Y --~·""'--· ..... ·-------L.ASORA"!Of'llE;,-

... ... ,

·.' ,> ":

... Trust our People. Trust our Data:· VvVIW.etieigyiab.com ..

. :.::• ..

.. , JLIENTi •#omestake Minfugto ~-G~~n~ ..... :.: :::· \::)llO;JECT: _(fr~n-~i\ t(: :: ::. :.:: ... · · -RE~ORJ,'llA'{F;:)\fay 17)2019': ... · ,. ·

: . :Quarter/Date Sainplecl : . : ·Air Volume

C 19010089°002 :

Fourth Quarter 2018 :

. _Air Volume in mLs

Radionuclide .

·: _· '::"ato::: 23°Th

.. _226Ra

. ''.

. ••'. .>

: (;_oncentration µCi/mL·:·

4E-18

·· Toll Free: 888.2~_5.0515 •• 307.235.0515 o H07.234; f639 . ... · :: :; ; : 'Piii3q~_24?, Gasµ,er, WY- 82602-:0247 • 23.9?SaJt Creek Hwy:(82601) -:··~---A~ • -

. ... ... . · ..

. : Counting· · Precision:

µCi/mL NIA

2E-18: .

- IE-17 ·

. .. ···:.

l\'.l])C 11 Ci/riiL

.. NIA

3E-18

... 7E~18

. - .. ·~· ...... 1, . .. ':····· ...

•.' ..

... ·-· ..... . . ..... _-... · ' .. . .,. ,'

i;.I;,,D.+ Effluent Cone): % Effluent µCi/mL ... yCi!mL Concentration

IE-16 : :~E-14 · 4Es02 :·

: lE-16 3E-14 .. IE-02

: 1EcJ6 .. ?Eci3 : . 4E;-Q3 . . l.46E+ 11 t----,-----,--:-:--c---'--------,-..__----.__--,-,...,....---''-----,----'-,-------'---,------,--,----'

+LLD's are from t{RC Reg. Guide { 14 : · ·

... *Effluent Concentration from the_ NEW iO CFR.:Part 20- Appendix ii _:.table 2 ..

Year for Natural Uranium:· : Year.for.Thorium-230.

Week for Radiuni~226

· -Day for Lead-210

Page6 of2~

ENERGY LABORATOR(E:S

~~· · Trustour.People. Tru~t our Data. · ~ viww:enl!!gyl~:b.com ·

~~~====='--..-C Biliings; MT800.735A_489·· Casper, WY888;235~0515 · Gillette, WY 866.686.1175 • Helena, Ml877A72;0711

LABQIµTORY ANALY'TICAL REPORT • .. Prepc:1red by Caip~r.VVY Bra.nch. . . Revised Date: 05/17/19 • .

Client: . Homestake Mining:c:o;

Project:· Grants • Lab ID: Cl9010089-003· .

Client .Sanipl~ ID: HMC-2. •

Report Date: 02/11/19

....... Collection Date: Nbt Provided

Date:Received: 01/04/19 • • . . . .

Matrix.: Filter

... MCL/ Analyses .. ·· · Result : U11it~ : · Qual • RL · QC.L Method: · · .. : Analysis Date/ :Sy;••: ·

. : METALS, TOTAL:: V1:1nadium.

·· METALS·, IN AIR.· • •::. Uranium

Uranium; Activity

. RADIONUCLIDE$·~ IN AIR .

··• .. Radium 226

Radium 226 precision (±)

Radilir'n 226 MDC "' ...

· · Thorium 230

•.::: Th.oriurn 23.0.precisiori'(±)

Thorium 230 MDC

· <0'.10 mg/filter.

<1;5E>io mg/L

<1.0E-16 uCi/mL

•. i ?E-1 i · uCi/mL

9.4E-18 uCi/mL: :

6. ?E-18 uCi/mL • . .

6.5E-.18 · uCi/mL

1.2E-18 .. uCi/mL

2.3E-18 uCi/mL: · .

. • RADIONUCLIDES - IN AIR ~ PER FILTER Radium.226. 4:0 · • pCi/Filter .

1.4 pCi/Filter::. . 0.99 ... pCi/F1lter · ·

0.9? • pCi/Filter

Rc1diu.m 2~6 precision (±)

. . Radium 226 MDC ..

· · : Thorium 230

Thorium 230 precision (±)

Thorium 230.MDC

·. Uranium, Activity ·

· 0.18 · · • pCi/Filter

0.35 pCi/Filter. • . ' .... ,.

· · 4.3 · .• pCi/Filte'r

RADIOCHEMISTRYAiR FILTER COMPLIANCE Radium 226, % of EFF

· Radium 226, EFF V\/e~k • ·: • Radium 226, llD • ·

Tti6duin 230; % of EFF

Thorium 230; EFF Year

· · Thorium 230, LLD:.

: ·•:•.Uranium Natur'~I. ·0;,., of EFF

Uranium Natural, EFF Year ·

LJranii.im Natural, LLD

3.0E-03 %

.. 9.0E-.13 ·: uCi/mL

· • 1.oE.:15 uCi/mL

2.0E-02 %

3.0E-14 uCi/mL •• · ·

.. 1.CJE-.16 ·. uCi/mL

• 3.QE-02 .% 9.0E-14 uCi/mL • .

1.0E-16 LiCi/mL •..

: d..iENTPROVIDEb FiEi..b PARAMETERS ·. Air FUterin/i Volume

Report : .RL~ Analyte ·reporting limit ·

Definitions: . Q(;L - Quality control li.rriiC •. • .

1.49E+8 L

MDC·~ Minim.um detectabie c6ncentrat!o.n.:

0 .• 10 ·

1.5E-10

1.0E~16

· .0.20

SW6020 •··

Si.iv~(@ SW6020 · ·

E903:b.

E903.0

E903.0

E908'0·

·• . E908:o• E908.0

02/07/19 17:20 /jcg ·

02i05/19 15::33 / jcg

• W,/05/19 15:33 /jcg · ·

01i22h9 17:31 / nsr

01,22,19 17:31 i risr • • • 0:1 /22/19 17:31 /nsr ·

02/06/19. 06:50 I arh

02/06/19 06:50 / arh

. : . • 02/06/19 06:50 i arh . . • . ,. "

RADCALC. 02/08/19 14:43 /.sec.

RADCALC · • · • •02/08/19 14:43 {sec RADCALC . . 02/08/19 .14:43 /sec : • .

RAD.C/\LC 02/08/19 14::4:3 I sec

· RADCALC· · · ·02/08/19 14:43 (sec·

RADCALC ... :.':02/08/19 14:43 /:sec:

RADCALC. 05/16/19 14:26 / sec .

RADCALC . • 02/08/19 14:44 rset · . RADCALC 02/08/1914:44 / sec

RADCALC 02/08/19 14:44 / sec

RADCALC. · 02/08/19 14:44 isec .

RADCALC : : <02/08/19 14:44 isec • · .

. 'RAb:C;:ALC RADCALC ..

02/oaii Q 14:44 I sec

05/16/19. 14:31 / sec

RADCALC 05/16/19 14:31 /sec. •

RADCALC . · : 05/16/19 14:31 /sec ...

FIELD · 12/31/18 00:00 /.**~. · .

· MCL. -Maximum .contaminant level.

ND - Not d~teded. at the reporting limit.•·•

Page 7 of24

.... "'-'--'-------'--"'"'--'--m.r EN:RGY

!.ASORA'l'QRl!itS

Trust our P.eople. Trust our Data:-1vwy.i.erieigyiab.com -.

. ;

,. ::': -'. Toll·Fre~, 88~.235.0-~15· •: ~07.235.0515 • Fjo7 .234: f639 ::: PO si~,2~?, 9a~P.~r. Wv '!l2602"0247. • ~~-93 ~a.It _Creek- Hwy:(82600 _

...... ... ..... .

1: •• · ••. ;,.

:-~,i;: :.::--·. ·_;:• :·-- ,_. -_:. ,.-:::· 1P~-~\tdtuM~~IR~SAMPLING'~~oR1\. ·:· :,--:, :,:: .. t: ...

-·:··. ··:. ·1· ..••

-· ··-

) ·:·;.. • ".• ·s--·~ :.•••·.•, > • .- •·•,,••• • • ·::: •• ·~' ••• ~··~it.·'.. ·.::. '.':::·:·

.. • 2 .. 1;~~~(~.f ilZ~g.CO c G"':" > < •. . ; : ;11, .·.• . • • c i ......... . .. ...... , ...

,· •C •,

- •: • 'v • • ~

..

: : : : : :Q~arter/Date Sample~ : : : : : · ··AirVolume

C19010089s003·: -·

F!mrth Quarter 2018 :

_ /Jr Yol_uirteirt:mLs

Radionuclide

·:::""'u:-230Th

_ .. 226Ra _

!'. ••••• . ~ . . . . ... -·· ':. . . (·.(-· ..

--· : toncentration . ·µCi/mL:

-:3E0 17:-:· 6E-18

3E~P

. • :•.,

· C_oun~ing ·Precision

µCi/mL NIA

lE-18:

9E-18

... <• -.·· :,.••••

·' .-.. . "" ~

·•.· ',: ,::.. .

:i'.;.1;,.D.+ l\1J)C µCi/riiL --

µCiimL

·::.N/A: lE-16

2E-18 JE~16

... ?_E-1.8 :rn°1~

' : ·:~ .; . -- '~.:-··. _-, . : . --.. -

'·. ·=··

Effluent Coiic/ % Effluent · µCi/mL - Concentration

3E-14.. 2E-02

C.:: -1.49E+l 1 t-------,--~~-----~------'------..__ ____ _._ _____ _._ _____ _.

+LLD's:are:from, Nile Reg. Guide {14:: · . . . · · *Effluent Concentratio_n from the. NEW 10 CFR Part 20 -:Appendix B -·Tab1e 2

Year.for Natural Uranium:: .... . . . . . . . . .

Year for Thoriinn~230

Week for Rad_illm."226

.. na:y:for Lead-210

Page a af2~

Trust our. People. Trust our Data: · viww:ene:rw.la:b.com ·

iiiliings; MTB0~.735~4489 • Casper, WY888;235.0515 . Gillette, WY 866.686.7175 • Helena, MT 817:472iOJ11

LA}lQi.lATORY ANALYJlCAL REPORT'. .. Ptepc1red by caipet, :WY Bra_nch . liev.ised Date: 05/17 /1~ • • •

Client: . . Homestake Mining:Co : .

Project:· Grants .. . .

·: Lab ID: Cl9010089~004

ClientSample:ID: HMC-3 ::

Report Date: .02111119

. .. : .. Collection· Diite: Nbt Provided

Date:Received: 01/04/19 •· :.

Matfix: Filter

. . MC.LI Analyses .. :· Result : UJ1Jts::.. . Qual • RL · Q(:L Metho~ • · · · : ·::. Analysis Date/ :By:•.

. : METALS, TOTAL:. Vanadium

METALS, IN AIR:·· : •: • Uranium

uranium,. Ac~ivity

.. : RJ\DIONUCLIDES -~ 11',1 .AIR·: • ·: : • .Radium 226

R~diuni .226 precision (±)

Radilim 226 MDC

: · ··Thorium 230

.. · : : : Th_orium. 23_0 precision (±)

Thorium 230 MDC

· <0'.10 ··•mg/filter ..

: : 1.~E-:1 b. mg/L

1.1 E-16 uCi/rilL .

: 2.2E~f7 uCi/mL

8.1E-18 ucitml . > 6.9E-18 LlCi/iiiL •

· 5.0.E~18 · uCi/mL

. · 1.7E~18 uCi/mL

1.7E-18 uCi/mL : · .

RADIONUCLIDES - IN AIR ~ PER FILTER · Radium .226 3;2 · · · • pCi/Filter .

1.2 pCifFilter : : . R_adium 2~6 precision (±)

. . Radium 226 MDC .. . . : . . 1.0 .. pCitF11ter

· · Thorium 230

Thorium 230 precisibrl (±)

Thorium 230.MDC

· ·.· ... Uranium; Activity · ·

Q.74. pCi/Filter

· 0.25 · pCi/Filter · ·

0.24 pCi/Filtet. : ..

16:2 ·. pCi/Filter

RADIOCHEMISTRY AiR FILTER COMPLIANCE Radilim 226, % of EFF

. . . . . . . . . · Radium 226, EFFWeek ·.

···::_Radium 226, LlD : Thoriuin 230; % of EFF

Thorium 230; EFF Year

•·.:·Thorium 230, LLD:: · · · · Uranium Natural, % .ofEFF

Uranium Natural, EFF Year· . . . . . . . . . _Uranium :Natural, ~LD .

2.0E-03 %

. 9.0E-.13 uCi/mL

1.0E~16 : uCi/mL

2.0E-02 % 3.0E-14 utitmL •··

"

1.01;"16 : uCi/mL

1.2E-.01 •% 9.0E-14 liCi/mL.

1.0E-16 ucitrnL •··

··. cLiENT.PROVIDED FiELbPARAMETERs·· Air Fil_terjn~ \/olume 1.47E+8 l.

Report : Rl~ Analyte reporUng limit . Definitions: : · · ·a·cL Q 1· · .. .. · : . • .. - · ua 1ty contr.ol Hniit_. : : ..

Moc ". Minimum detectabie c6ncentratio_n. ·

0.10 ·

. }5E-10

1.0E.016 ·

· · .0.20

· SW6020 :··

siivi:io:20 SW6020 • ·

.E903;o: . -·. .

02/07/19 17:24 /jcg

02i05/1~ 15:.38 / jcg

02105/19 15:38 /jcg

01i22h 9 17:31 / nsr E9o3.o ··· ·· · . 01,22119 11:31 irisr E903.0 : •o:1122/19 17:31 /:mW: E908:o· ·

·: . E908:0:

E908.0

. · RADCALC.

02/06/19. 06:50 I arh

02/06/19 06:50 I arh

: . : ·02/06/19 06:50 i'arh.

.02/08/19 14:43 /.sec .

RADCALC · · · 02/08/19 14:43 /sec .

RADCALC . .. . 02/08/19 1_4:43 /sec .

~D.C:J\lC 02(081;19 1 "1::~3 / sec

· RADCALC 02/08/19 14:43 /sec

RADCALC . . : ; 02/08/19 14:43 /:sec:.

RADCALC . 05116/19 14:26 / sec . .

RADCALC 02/08/19 14:44 /sec . : • : ·

RADCALC 02/08/19 14:44 / sec

RADCALC 02/08/19 14:44 / sec

RADCALC . . · .. :02/08/19 14:44 isec

RADCALC : : . >02/08/19 14:44 isec .. RJ\DCAlC

RADCALC

RADCALC

. .

02ioah ~ \4:44 I sec

05/16/19 14: 31 / sec

' .. 05/16/19 14:31 /sec .. •

RADCALC .. ·. 05/16/19 14:31 7sec: :

FIELD :: 12/31 /18 00:00 /**~ · .

. MCL -.Maximum contarninant level.

ND - Not deteded at the reporting limit. : : :

Page 9 of2~

i.~_RGY LABORATORIES

Trust our People. Trust our Data:· www.erleigyia~.com ..

... .. 'Tollfree, 888.23_5;0515 •: 307.235.0515 "F;:307.234;1639 : : : :·po ·so~ .241,GasP.er. WY ·s2so2.:624t~ ?~.9~ ~aJt.creek i-iwy:(82601!. -=c:.:0.-.;.J.,

•• ' : • ') • • • • • i .~ •• ,· ·, • ;

.. _:::: :·'::: ·.·" ... ·. HIG_BVOLUMiiAplSAMP1:>ING:IU};On;l: ..... ; . '

. Si\J\1PLE:JOi1fflC,3: ·

Radionuclide

C19010089°004 : : · ·

.: FourthQuarter2018 > 23°'fh

' ' ',Air Y\>IU!rte,in mLs '

... ; ·.····

: Concentration µCi/mL

SE-18

'' , . '' ···" ."' :.. ' ' ~ . . :

•·cqun~g· Precision : . Ml)C l1 Ci/riiL µCi/mL

NIA :· NIA•

2E-18 . 2E-18

· 8E-I8 7E-1.8

. . .. ~ . ', ' : •,. . ,·: ~

···.···.· ':•v• -.,.;,,' "' ..

.. :.• ·:: :.·-·-.·

L.1;,.n.+ Effluent co:nc~ * . . % Effluent .. µCi/mL ·· · · . : 1,1Ci/mL · · Concentration

lE-16: : :lE~Ol::

lE-16 3E-14 .. 2E-02

: :IE-l(i .. 2E-03. . . . 1.47E+ll 1-----,-----'----,------'"------'--,-,--,-~'--------,-,-.,----~--c----,-,.,...,.-

+LLD's are fron1 i\HtC Reg. Guide { 14. . . . . . . . .

···*Effluent Concentration from the NEW 10 CFRPart 20 -Appendix B -Table 2 ·

: : . \'ear for Natural Uranium Year for Tlioi:iiun~230

Week fot Radi~uic226

.. Da:r:for Lead-210

Page tO·of:?4 :

~-:-;-,c--:,-:--.,,,...,~,::::-,--,---,---,---,------------.......,.~----·. . .. . . · Billing~; MTBOD.735-.4489'•:casper, WY·BBB:?35.0515 . Trust our.People. Tiusfour Data,·

~\'IW:enei~l.ib.com . : Gilletle,WY86~~&8~.7:175" Helena, MtBn472i~711 . .

LABORATORY ANALY'tltALREPORT: .... . . . . Ptep~red. b}' Casp~t. 'wv- Bran~h . . . . : • : )levi,~ed Date: 05/17 /:\9. : •.•..

Clienti . Ho01estake Mining:¢0;:. >·· Repor(Date::02111/19 . Project: ·. Grints . . . Collection: D~te: Nbt Provided.

. . .. n:atell._eceived: 01104!:W :::::: :' Lab ID: C 19010089~005. ... . .... ' ... - .

·clien.t:Saiijpl~ ID: HMC-4 : . Matrix.: filter ,, . '

.. l\'.IC.L/' Analyses:•:· Result : ;UJJits : : Qual : :RL · QCL Method : : : · : : : : . Analysis Date / By

METALS, TOTAL:: .. Vanadium·.·

· METALS, IN AIR: · ·· .. :: Uranium

uranium; A:ctivity ... .. ... . ....

. :AAPl0NUCLIDE$ •~ 1N: .Al.Ft·: ( : : R.adium 226 : : : : : : : :

R13dium 2~6 precision (±)

Rad.iiim 226 MDC

. . . : . : · Thorium 230 : : Th_orium 230p'recisiori .(±):

Th_orium 230 MDC

· <0'.10 · mg/filter. ·

: : <1 ;sEci O : mg/L

<1.0E-16 UCi/rnL

: : t'l;!i;-fi : uCi/mL

9.2E-18 liCifml,. :

6.9E-18 liCi/riiL : :- 5.9E-:18 ·. uCi/mL . : 2·.0E;1 g:: uCi/mL

2.3E-18 uCi/rnL.

: RAD.IONUCLIDES :- IN :AIR·~ PER FILTER · · Radium.226.

R_adiLJm .2~6. precision (±)

. Radium 226 MDC ..

. . . . . '.Thorium 230 Thorium 230 precision (±)

Thorium 23.0 MDC · . Uraniu'ri,, Acfivity

. · ·3:9 ... : J)Ci/F.ilter,

1 .3 pCi/!=ilter ; : . . .1.0 . . .. pti/F1lter .

:9..8~ : : . : pCi/Filter · 0.29 · : pCi/Filter

0.33 pCi/Filtei:: .. · ·6.7. · : . : pCi/Filter

RADIOCHEMISTRY.AIR. FILTERCOMJ:>LIANCE Radium 226,: % of EFF . .

. . . . . : .. : · Radium 226, EFFWeek: ·: ,.. ... . ..... .

.. · : : : : _Radium 226, LLD< : : :

Thonum 2,30; % of EFF Thodurn 23·0; EFF Year

Thorium 230, tLD .. . . . . . . .

· · • : : Uranium Natural,. % :ofEFF

Uranium :Natural, EFF Year:· .. .. . .. _Uranii.im :Natural, ~LD .

.. , ...

3.0E-03 % :: .. : : : ·9·.oE-.13 ·: uCi/mL

: : 1.0E-:HL uCi/mL 2.0E-02 % ...... .

3.oE-14 uti/m.1,. .. . :: ·1'.91;j~ ·: uCi/mL

. : 5:QE--02 •: % .......

9.0E-14 liCi/mL : . : ·.

1.0E-16 uCi/rriL :

=cuENIPROVIDED·FlELtfl:>ARAMETERS . Air Filtering Volume 1.45E+8 l.

.. ... ., ...

·reporting limit .. ; . Definitions:: . ;ocL - Quality control Hri'lif::.:

·Mot -: Minimum detectabie concentratjo.n.

.,,, ...

OJO

1,5E-10

1.0E016

·.0.20

, .. ,, .. .

· sw5020 . . . . . . . . 92108119 17:50 (,jcg .

sW~o~o 0219511~ 1s:421 jcg SV\/6020 :·· · · oi1ost1915:42 tJcg

: : . EJ303;6 .

E903.0

E903.0

E908:0 ·: . E908;0:

E908.0

01i22h~ 1i:31 / nsr :· · ::::01/22/1917:31 (nsi· ·: .. ·

: : 0•1122/1917:31 rns(: • ·· · 02/06/19 06:50 I arh

02/06/19 06:50 / arh 02/06/19 06:50 (arr , : · .

, ..... . · RADCALC .02/08/1914:43 /.sec

RADCALC : ·: :02108/19 14:43 /sec · .. ,,.,.. . .... RADCALC · ...

:F:!AP¢A~C . RADCALC

RADCALC RADCALC.

RADCALC . ::· RADCALC.

RADCALC

RADCALC

02/08/.19.14:43/sec::: .

02/Q8f:HJ 1,,(:4~ I sec . ·02/08/19 14:43 (sec

: . : 02/08/19 14:43 / sec:· 05l16/1914:26 / sec··

: : :02/08/19 14:44 rsec::. : ·:;::

02/08/19 14:44 / sec

02/08/19 14:44 / sec : .. 02/08/19 14:44 isec . . .

RADCALC . : : : : · ::0.2/08/1914:44 /sec

MO:CALC ·: .RADCALC

02/oaifa ·14.:44 / sec

05/16/19 14:31 / sec

RADCALC .. 05/16/19 14:31 /sec ..... RADCALC. : ·::05/16/1914:31 rsec:: :

FIELD · <12/31/18 00:00 I:**~ ..

. . Mel·- Maximum .contarriinimt level.·· . . . . ND - Not detecfe~ at the reportin·g limit. :

. . . .,. ,.,

. : . : : . · Toll Free: 888.23.5.0;i15: •)07.235.0515 • F;:307.234;J639 . "po Bqx. 247, _Ga.SP.er, WY "li26Q2;Q24? -~ 2~.9~ ~aJt Creek Hwy:(8~'.6°0{).

.EI\ERGY 'i-:-AE!ORATO~IES

,. ., .:1',,

HIGB,VOL1JME AIR SAMPLING':REPORT. .. ...

' .. CLiENT:'Homesta~~Mi~g·co:.·Gt~nts ..... '•. : .. , .. (::PROJECT: Griuits: .. :.::·· · · ,·. ·: .''iuti>Ok;r.n~1:E:.M~~i1;2o'i9:: ....... .

. , .. .. .. . s.AMPLE inhiM:c,4. . . .. ... :, . . . . . ~ . . . . . .

. ... .... . .... , .. ,

/ .. , ' .... ... ... . . . . .... -·· ..... ' .

;QuarterIDate Sample~ · ·. AirVolume

. Counting ... L,L,D.+ Precision . 1\u>c µCilmL Effluent Cone,* % Effluent

Cl901008_9°005.:

: Fourth Quarter 2018 . ·

· · · : . . . . _Air Volµme in mLs · --------l.45E+11

+LLD's are fro111 N~C Reg. Guide 4,l 4_::

*Effluent Concentration from. the. NEW IO CFR Part 20 -_ApJ.)endix B · Table 2 Xearfor Natura!Uranium •

Year for Thoiium~230

Week for Rad_ium~226

. Dayfor Lead-2 IO

µCi/mL NIA

2E-18: ·. ·

9E-18 · ·

.. µCi/mL · · . . · µCi/mL Concentration

: .. N/A:· lE-16: .. :9E-14 ·:5Ec02 :

2E-18 lE-16 2E-02

7.E-1.8 IE-1~ .. . _3E-03 ..

Page t2of?4

=:::::::::o:=====c=====::====.w•. EN:RGY L.AISORAmC>RIES

Trust our.People. Trust' our Data. · ,w,w:energjlah.com

LA)iQRATORY ANALY'.flCAL REPORT

Biliings; MTBOD.735;4489 • Casper, WY 888:235:0515 Gillette, WY 86&:.s_ss.7:175 " Helena, Mt877:472;~711

Client: Hdmestake Mining Co . . Project: Grants

Prepared by Casp~r, WY Branch . • llev.ised Date: 05/17/:IQ : .

Report Di,te:. ~2/11/19

LablD: Cl90I0089-00fr_

Client Sairiple ID: HMC-5 • .

. : . Collection D~fe~ Nbt Provided ..

DateReceived: 01/04/:19 . ' - . . . . .

Matfix_: _Filter

: ... l\'.ICL{ Analys~s:::· • · Result : Ul)iti : · Qual ~ QC.L Method : Analysis Date/ By

-· METALS, TOTAL•. Vanadium·

M~TALs·, IN AIR · · :·: :Uranium

Uranium, Activity·

. RADIONUCLIDE$ - IN AIR : · · • Radium 226

Radil!m 226 precision (±)

Radilirn 226 MDC

· · · Thorium 230

. Th_oriurn 230 precision (±) Thorium 230 MDC . , ,, ''

<0.10 ·mg/filter.· · ·

: <1 :5E~10 mg/L

<1.0E-16 uCi/rnL

·: ?.6E::~1 i uCi/mL

8.6E-18 L!Ci/mL.

6.7E-18 tlCi/mL :

· · 6.9E.:1 s · uCi/mL

. OE;1 s . : uCi/mL

1.9E-18 uCi/mL: ·:

.. RADIONUCLIDES - IN AIR~ PER FILTER · · · · · · Radium 226 ·3:7 .. : pCi/Filte_r. .

1.2 pCi/f:ilter •• Radiu_m 226_ precision (±)

.. Radium 226 M_DC . . .. · ... 0.98 pbi/Filter ..

· '.fhorium 230 : ·

Thorium 230-precision (±)

Thorium 23.0.MDC

. uranium; Activity · ·

: '.1.0. · pCi/Filter

0.19 pCi/Filter- ·

0.27 pCi/Filter •: .. · · · · 7.3 ·. · pCi/Filter

RADIOCHEMISTRYAiR FIL TERCOMPLIANCE Radium 226,. % of EFF

Radium 226, EFF 1/Veek · · · · Radium 226, LL:D·

Thorium 230, % of EFF

Tho~um 230, EFF Year

· Thorium 230, LLD ..

• · : : .Uranium Natut~I. % of EiFF ...

Uranium Natural, EFF Year:· .. . . ' '

Uranium Natural, LLD

3.0E-03

·. 9'.0E-.13

: fOE~16

2.0E-02

3.0E-14

1.0_1;:~1~

·: 6.0E-02

9.0E-14

1.0E-16

CliENIPROVIDED FIELD PARAMETERS •

o/o uCi/mL

: uCi/mL

% ... .. uCi/m_L:

. uCi/mL

% LiCi/mL: .. LiCi/rril:.:.: ..

Air Filtering \/olume 1.45E+8 L

Report : _Rt.:-~ Analyte reporting limit. · Definitions: • · · QCL - Quality confrol liriiiL •

MDC ·.: Minimum detectabie concentratio_n.

0.10 ·

• :1-SE-10 1.0E~16 ·

.0.20

SW6020

sws620

sVvso20 ·

E9o3:o:

E903.0

E903.0

E908,0·

E908:o:

E908.0

· · 02/08/19 17:54 !jcg

02iQ5/1 ~ 15.:4;7 /jcg

0;2/05/19 15:47 /jcg·

01i22/i !;J 17:31 / nsr

.. : . 01/22/1917:31 /nsr

· 01/22/1917:31 rnsf·

02/06/19 06:50 / arh

02/D6/19 06:50 I arh

• .. 02/06/19 06:50 iarh '.. . ...

RADCALC .02/08/19 14:43 /.sec

RADCALC · :· :02/08/19 14:43 /sec

RADCALC · . . .. 02/08/19 14:43 /sec

RAOCALC . 'RADCALC

RADCALC RADCALC.

RADCALC

RADCALC

02/08/:191{43/sec

02/08/1914:43 /sec- .

02/08/19 14:43 / see . .. ,, 05/16/19 14:26 / sec

02/08/19 14:44 /see .. ·

02/08/19 14:44 / sec

RADCALC 02/08/19 14:44 / sec

RADCALC. . .... : • : 02/08/19 14:44 isec . ·

RADCALC . : . 02/08/19 14:44 /sec ... MDGALC 02ioaii~ ·14_:44 / sec

. : . RADCALC 05/16/19. 14:31 / sec

RADCALC • : 05/16/19 14:31 /sec.

RADCALC . · :•os,16119 14:31 rsec:

FIELD · : : 12/31/18 00:00 /***

. MCL - Maximum contaminant level. ·

ND - Not detected_ at the reporting lim_it. • . :

Page 13 of24

. ' ' . . . . . .

EN:RGY Trust our People. Trust our Data'.· _: ... ; . [N;"l!'!tli"li\'r>1J}i'g,1' . · .. : . : : ··Toll Free: 888.23_5.0~15: •: 307.235.0515 • F;-307 .234; 1639 www.en_ergyiab.com . . : " :.: :~J\~?1fi1.Xhi.1: .. .. . .. . .. . . . . . .. . . . . . . . . -L.ABORATORIES" ----_,;_c.'--'-'-'-'-,-'-'-,.-'--__,,.· .. : ·_;,:· - :: , ... ,: ;: ·. _ ,. ·_ - · •: : Pq Bq~_247, ~a_sP.er, WY 82602"024?.• 2~_93 ~a_lt_Creek Hwy (8260l).

' ,. '.. . ... : · · ··· ~ _:. · .... ·HIGH:VOLul\iDi Am SAMPLING. ·J.{EPORT ...

.. . , • " ... "· d. "'' ' •• CLIENT: "Homestake ~nihg Co~ Grants ... ' .. " ..

.. :-- :-::PROJECT: Grants:· ,: ::. ;_::_: -- ··REi>oil:r;_nA'i:E=M~i11;:io19•: ....... __ ._

(Quarterillate Sainpleii . : : : -Air Volume

C19010D89°006 : : ·:

Fourth Quarter 2018 . -

. Air Volume in rnLs

Radionuclide

23°Th

______ 226Ra _

: ·concentration ·µci/mL·:

· SE:.17 ·

7E-18

3E~p

: : C<mnting -• Pi-ecisioii:

µCi/mL NIA

IE-18

9E-18

::• .. ,:..,:: ..

1\1:IJC µCi/riiL

.:.N/A:

2E-18

7_E~18

1,:.I,,D.+ ..

µCi/mL

IE-16

IE~16

:rns16_

~-: . ; ...

.... ....

Effluent Cone:.*: % Effluent µCi/mL Concentration

9E-14 · 6E~02 ·

3E-14 2E-02

9Ecl3:: . 3E-03_ 1-----------'-------'------'------..__ ____ _._ _____ _._ _____ _. l.45E+l 1

+LLD'nire from fUtC Reg. Guide 4:14_ ·: _

*EJ'.fluent Concentration from the. NEW 1 O CFR Part 20 - Appendix B -Table 2 · .• : y" ear for Natural Uranium :

Year foi" Thoriiun-230

Week for Radium"226

.. Day for Lead-210

Page 1_4 of ~4- •

·El!\ERGY' 0

LAB0RAT0R1ES

~-·-:·;; • N. TrustourPeople.TrusfourData: ~ viww:ene_r!zylah.com

Biliings; MT800.735A489·., Casper, WY888;235:D515 . Gillette, WY 866'.686.7175 • Helena, Ml817.472:D.711

LABORATORY ANALYTI(:AL REPORT .. . . . Prepared by Caspet WY Branc;h l{evJs~d Date: 05/17 ll 9 ...

Client: . Ho01estake Mining Co •. ·• ·

Project: · Grants ..

Lab ID: Cl9010089~007 .

ClientSariiple lD: HMC-6 .

Report Date: .62/11/19 : : . Collection Date:· Not Provided ...

-MCL/

DateReceived: 01/04/19 •··

Matrix_: __ Filter

Analyses-•.· . Result : Units·.. Qual : RL · QC.L Method• · · • · • • Analysis Dat~ /By: .. ·.•

· METALS, TOTAL•. Vanadium.

. · · · METALS, IN AIR • · · ·

· .•: •• _Uranium

Uranium, Activity

<0'.10 mg/filter

<1:5E~10 _mg/L

<1.0E-16 uCi/mL·

• R.6.DIONUCLIDES -~ IN AIR · . :·:::Radium 226 •• 4.~E.:17 : uCi/mL

Radium 226 precision (±)

Radium 226 MDC

Thorium 230

· : : Thorium 230 pfecisiori (±)

Thorium 230 MDC

. RADIONUCLIDES - IN AIR~ PER FILTER · · Radium.226.

Radium 2~6 precision (±)

. Radium 226 MDC . . .

••••.Thorium 230

1.4E-17 uCi/mL

7.0E-18 uCi/rhL

8.5E-.18 ·. uCi/mL

1·.6E~18 •: uCi/mL

2.2E-18 uCi/mL.

6:2 · · · • pCi/Filter

2.0 pCi/Filter •. . . 1.0 ... pCi/F1lter ..

. :1 ;Z · • • pCi/Filter

0.23 · pCi/Filter · Thorium .230 precisibri (±)

Thorium 23.0.MDC o.32 µCi/Filter• •.. . . . . . .

. ·. •. Uranium; Activity · · · · · ·3.5 · .• pCi/Filter

RADIOCHEMISTRY AiR. FILTER COMPLIANCE Radium 226,: % of EFF

·:· .. ·Radium 226, EFFVVeeik ·

• ••:Radium 226, LE.o•

Thoduin ~30; % of EFF

Thorium 230; EFF Year

· ··Thorium 230, ~LO. • · · • • · •·••·Uranium Natural, % .of EFF

Uranium Natural, EFF Yea(· . .

.. Uraniilm Natural, LLD

5.0E-03 %

9:0E-13 • uCi/mL : : 1:0E~16 : uCi/mL

3.0E-02 % 3.0E-14 utitmL •

·. 1.QEc:16 • uCi/mL

·: 3.0E-02 :% 9.0E-14 LiCi/mL

1.0E-16 LiCi/niL •

CLiENT PROVIDED FiEL6PARAMETERS. : : Air Filterin~ Volume

Report : RL- Analyte ·reporting limit . Definitions: • . . Q(;L - Quality control liriiif. • .

1.44E+8 l.

. . . MDC:.: Minim.urn detectabie concentration ..

..

0.10 ·

1.5E-10

1.0E'-'16

·.0.20

SW6020 ··

siivs620

SW6020 :·

t903:0.

E903.0

E903.0

E908,0 ·

E908:o•

E908.0

. · RADCALC.

RADCALC

02/08/19 17:59 (jcg

02i05/1 !3 1. 5:/)1 / jcg

· ... 02/05/19 15:51 /jcg

01i22/19 17:31 / nsr

-01/22/19 17:31 /nsr .. •

· • •0.1122119 17:31 rnsr • • · ·

02/06/19 06:50 / arh

02/06/19 Off:50 / arh

•.: 02/06/19 06:50 i-arh .

.02/08/19 14:43 /.sec. .

<02/08/19 14:43 (sec

RADCALC · . . 02/08/19 14:43 /sec · .

RADCf.LC .RADCALC

RADCALC

RADCALC

RADCALC

RADCALC

RADCALC

RADCALC.

02/Q8/19 14:4:3 / sec

02/08/19 14:43 /.sec

• : 02/08/19 14:43 /set•

05/16/19 14:26 / sec . .

• -• 02/08/19 14:44 /:set .

02/08/19 ·14:44 / sec

02/08/19 14A4 I sec

02/08/19 14:44 isec .

RADCALC : • · • 02/08/19 14:44 (sec, • ·: . ·

RADCALC ... RADCALC

RADCALC

02/osh 9 14.:44 / sec

05/16/19. 14:31 / sec

: 05/16/19 14:31 /-sec.

RADCALC : · : : 05/16/19 14:31 /set.

FIELD . .. : 12/31/1800:oor···

MCL--Maximum contaminant level. ·

ND - Not detected at the reporting limh .

Page 15 of 2_4

EN:RGY ·LAsoRAT6R1i;:s·

Trust our People. Trust our Data:· : : : : \f(ifit®~l''J·\6f!"J··i: ·:::. j .• ::: Toll Free: 888.23:5.05151 •· ~07.235.0515 • F}ot:234:1639 WVIW.e_nergyiab.com . . ·:: : ..,'l,f.\.W~~\:illf . : . ·:: : PO Box 247, Ca.SP.er, WY. 82602"0247 ~ 23.93 Sa.It.Creek Hwy (82601).

..;.-,-,."';'---· .. -;--- -·. ' . . . . . . .

.. . . ffiGH VOLUME AIR SAMPLING REPORT ....

.. ,. ... CLiEN'fi Ho_mestal,;e.Minihg Go:: Gran~: ..

" ::·.· \P:ROJECT: G.r~n~:<:):.: ·: · ·'REPORT.QA'X'E;: ,May 17;2019·:

;: :: ... :: .. . . .. . . S.AMPLE ID: HMC~6. . . .

.. Quarter/Date Sample~ Air Volume·

C19010089s007 . ·

Fourth Quarter 2018 :

. Ai.r Vol:ume in:mLs

Radionuclide .

.·:::IU\'u·

230Th

.. 226Ra.

• Concentration µCi/mL· :·

·:2E0 17: ..

8E-18

4IH7

.. ·: ·::. :·::::

... . . - ~ .....

·counti~g· · : Precision :

µCi/mL NIA

2E-18

. lE-17

, .. -·:

...... . ...

;i.L,D.+ l\1J)C µCi/riiL .. µCi/mL

::NIA: IE-16

2E-18 rn:16 . ..

7.E~18 :IE0 16

. . . . ' .. ' . --~ . .... ..

. .. • .. '

Effluent C~nc/ % Effluent

,µ Ci/mL. Concentration

9E-14 : JJ;-02: ·

3E-14. 3E-02

9E0 l3' · . 5E-03 1----------''--------'--------'------..__ ____ _._ _____ _._ ____ .,.....,.~ . l.44E+l 1

+LLD's are from. N.RC Reg. Guide 4J4: ·

· *Effluent Coiicentnition from the.NEW IO CFR]?art20-Appeildix B -·Tabk 2 ·

. : . Year for Natural Uranium::.

Year for.Thoriinn,230

Week f9r Rad_iunic226

.. Day:for Lead-210

Page t6of?4.:

EN:RGY i.Asofv:m'>Rtss ~.f Trust our.People: Trusfoi.lr Data. ·

viww;enersylah.com Biliings; MT800.735A_489 ° Casper, WY 888:235,0515 .... Gillette, WY 866.6_86_.7:175 • Helena, MT877'.472:0_711

LABORATORY ANALYTJCAL REPORT : : : Pie·pared by Casp~r. VVY Branch Revised Date: 05/17/19 :

Client:. . . Holllestake Mining Co .

Project: · Graiits . Lab ID: C 19010089-008:.

Client Sample ID: HMC-7 : .

l\'ICL/

Report Date:. 02/11/19

Collection' Date: Not Provided. · ·

DafeReceived: 01/04/19 • ·

Matrix.: Fiit~r

Analyses • Result U11it~ : Qual : RL · QCL Method. . .. Analysis Date / JJyi

:' METALS, TOTAL-· Vanadium

· METALS, IN AIR ·: ·: _Uranium

Uranium, Activity·

. RADIONUCLIDES - IN AI_R · ·•._Radium 226

Radium 2,26 precision (±)

Radii.Im 226 MDC

· Thorium 230

. : . · : . : . : Thorium 23_0 _precision.(±)

Thorium 230 MDC

· <0.1 O · · mg/filter

0.00052: mg/L

3.5E-10 uCi/mL .. ·

·' 3.2E-·09 . uCi/mL

1.3E-09 uCi/m.L : · ·

1.1 E-09 uCi/rtiL : : ·

. · 4.2E-10 · uCi/mL

: : 2.1E-10.: uCi/mL

2.5E-10 uCi/mL ·

. : RADIONUCLIDES - IN AIR ~ PER FILTER · Radium 226 3: f · · • pCi/Filter .

Radium 226 precision (±)

Radium 226 MDC

Thorium 230

Thorium 230 precision (±)

Thorium 230 MDC

_Uranium, Activity·

1.2 pCi/Filter . 1.1 . pCi/F1lter · · ·

0_.39 : • pCi/Filter

· · · 0.20 · ·' pCi/Filter .

0.24 pCi/filter · · .. . . . ·0.33 ·. pCi/Filter

RADIOCHEMISTRY AIR. FILTER COMPLIANCE Radii.Im 226,: % of EFF

. · Radium 226, EFFWeek .

: : . . : : : : Radium 226, LLD : ·

Thorium 230; % of EFF

Thorium ~30; EFF Year

. · Thorium 230, LLD.. ·

···.Uranium Natural, % ofEFF

Uranium Natural, EFF Year:·

. Uranium Natural, LLD .

3.6E+05

. ·9:oE-.13 ·

1-.0E-16

1.4E+06

3.0E-14

· 1.0E-16

3:9E+05

9.0E-14

1.0E-16

.. CLiENT PROVIDED Fi ELD: PARAMETERS .. Air Filtering \/olume

Report Definitions: ·

_R~ ~ Analyte reporti_ng limit>

OC_L - Quality confrol Hri,it :

% uCi/mL

:uCi/mL

%

ucitmL :·•

uCi/mL

,%

uCi/mL •.

uCi/riiL :

l

MDC - Minimum detectabie concentratiori.: .

0.10 ·

D_L : 0:.000022

DL 1.5E-11

0.20

SW6020

SW~020 SVV6020. · ·

E.903;0:

E903.0

E903.0

E908.0 ·

E9o8:o·:

E908.0

02/08/19 18:03 / jcg

02i05/19 15:56 / jcg

02i05/19 15:56 / jcg

01/22i1917:31 / nsr

. : 01 /22/19 17:31 Ins~

•01122119 17:31 fnsr . • · ·

02/06/19. 06:50 I arh

02/06/19 06.:50 I arh

.... : 02/06/19 06:50 iarh •

· · RADCALC. . .02/08/19 14:43 / sec

RADCALC · · · :·: 02/08/19 14:43 /sec .

RADCALC · . 02/08/19 14:43 /sec .

RADCALC 02/08/19 14:4:~ / sec

RADCALC · 02/08/19 14:43 / sec

RADCALC . : : :02/08/19 14:43 /.sec.

RADCALC.

RADCALC

RADCALC

RADCALC

RADCALC.

RADCALC

R.A.DCALC

:: . RADCALC

05/16/1914:26 /sec.

: · • 02/08/19 14:44 /sec . ·

02/08/19 14:44 / sec

02/08/19 14":44 / sec

. 02/08/19 14:44 /sec

.. · 02/08/19 14:44 (sec:: • ·:.

02/08i1 ~ 1. 4:44 I sec

05/16/19. 14:31 / sec

RADCALC : . 05/16/19 14:31 /sec. . · RADCALC : . : . :05/16/19 14:31 /:sec' : : .

FIELD : ::12/31/18 00:00 /***: · .

. MCL-.Maximum coritarTiinant level.·

ND - Not deieded at the reporting lim_it. •. · ·

D - RL in.creased due to sample matdx ..

EI\ERGY. .LABORATORIES-

Trµst ~ur People. Trust our Data; . IWiw.eil~rgylab.com -----------·---·-· -. -•-····-•c·-·.···--

Billings, MT 800)35.4489 " Casper;vd 8.88.235.0515 GiUettei WY 866.686. 717~ • Helena; MT' 877.472.0711

~ ' . ... :.:· .. .. ::. :.:L . ····-

. .. HIGH VOUUMKAIR SAMPLING .REPORT ....... . . , .. : . . .

.. .. , ······ . . . . . . . . .. _ CLIENT: 'Ho_mestak~. ~illlllg .co :. Gfa~t.s ...

:: .:-- :<PROJECT: Grants:··:.:: . . :: · :REPORT.DA'l'~: ~ebru:jtyl°i;2019 ... . ... .. .

· · · REVI~F;P.OA.TE~ :May 17, 2019 ' . . .... S.AMPLE=Irii :HMC,7. ..

: . Quarterillate Sample~ .. : Air Volume·

C 190 I008.9c008 · · ·

Fourth Quarter 2018 • ·

. Air Volume in mLs ·

Radionuclide

. . . . ' ... - ~

: Concentration µCi/mL:·

:2Ec1_8: :

3E-18

2E-17

· C<mnting : . Precision·

µCi/mL NIA

IE-18 ·

, 8E-18 ·

. ...... . __ ;_

.. . .. . ..

MDC µCi/riiL L.L,;D.+ Effluent Co,nc.i

.. µCi/mL · · · _µCi/mL

NIA: IE-16 :: ~E-14

2E-18

.. 7E-18 :IE-16 . . 9E-l3

% Effluent Concentration·

. · ~E~03: •

9E-03

.. 2E-Q3 -------~~-----~-------'------~----~-----~------' 1.47E+ll

Mr Volumes oil this page b~sed on average of quarterly set; accompanying standal'.d report uses a J L default volume.

+LLD's'itre from NRC Reg. Guide 4J4 . . . .

·:. *Effl:uent Concentration froin the NEW 10 CFR Part 20:-:APP.endix B -Table 2 : :

Year forNitiuraJUrimium

Year fot Thori~ni-'230

.. Week-for Radium-226·

: DayforLeitds210.

Page 18_ of 24

• · Trust our People, Tni;toi.11' Data. v1ww:en~9ylab.com

. ·siliirigs; MTB00.735.4489 • Casper; WY 888.235.~515 Gillette, WY 866.68~ .. 7175,. Helena, MT877:.472 .. D711

Client: : Homestake Mining Co : ·:

.. Projed: Grants

QA/QC Summary Report · ··Prepared by Casper, WY Branch

: . Report Date: 02/11/19

Work Order: 01.9010089

Analyte Count . Result U.nits RL °loR.EC . Low Limit High LilTlit : : RPO RPDLirnit . .. tlual

Method:· ·swso20 .. Lal:ilD: QCS

Uranium

Lab ID: ICSA. "

Uranium

Lab ID:. ·ICSAB

.. Uranium

· • .Meth:Od: SW6020

Lab ID: · MB~!>3091

Uranium

: . l,.~b ·11:;>: LCS2-sjo91 Uranium

· Lab ID: C19010070~001ADU:.'

• •: .Uranium

Lab ID: · c19ojoo10-001APDS

Uranium

.. Method: . SW6020 · ..

Lab 10:: · ·: QCS Vanadium

Lab ID: . . ICSA

Vanadium. · .

.Lal:) ID: ICSAB ·

:.vanadium

Method: · .swao20 1,.ab ·10: MB-53Q9:z'

··:Vanadium

Lab ID: .. :L.Fij-~3092

· · · · Vanadium

Lab ID: C19010089~001BDIL.

Vanadium:

: Lab ID: C19010089700~6PDS

Vanadium

RL - Analyte repo'rting limit.

Initial Calibration Verification Stani:lard ...

0.0182 mg/L. : . : : : 0.00030 ...

Interference.Check Sample A

8.70E~06. . mg/L O:o'ci030

• Interference Chec.k S_ample./\B 4_.tOE-06 mg/L 0.00030

: Method Blank

0.0003. rrig/L .

Laboratory Control Sampl~

0.0852 mg/_L

Serial Dillitioh .. ·

5.29Ea:l 1 . mg/L

2E-05 .

2.ZE-05

: 1'.5E~10.

: Post Digestion/Distillation Spike

1.0BE-09 rrig/L 1.5E-.10

· · · : Initial Calibration Verification Standard

91 :

.. Analytical Run: ICPMS.il~C_J90205B

:02/05/19 13:4l

90 ·. 110.

Ruri: ICPMS4-C_ 190205B •:

Run: ICPMS4~C.:..190205B

02/05/19 13:46 ·

02/05/19 13:50

Batch: 53091

02/0.5/19 14:38

77 . : · 85 115.

02/05/19 14:42 :s·

Run: 1CPMS4aC.:_ 190205B :o 0

. :Run: ICPMS4-C_190205B : . . 93 . 75 .. 125

'02/05/19 14:56 .

20

02/05/19 15.:01

Analytical Run:• ICPMS4-C_ 190207A

02/07/19 15:55

0.0514 rrig/L 0.01 O • 103 . 90 . 110

.. Interference Check.Sam~le.A ·.

-0.00179 nigt~: · 0.010

Interference Check Sample AB:

0.0176' · mg/L . O.Ci1d

Method 131arik ·

. : , : ND mg/filter

: laboratory Fortified Blank·::::

· · 0.050 : ·mg/filter

Serial Dilution

"0.10

0.0058 mg/filter . 0.10

Post :Digestion1Distillation Spike · · · 0.12 . mg/filter . 0.10 .

Run: ICPMS.4-C~ 190207A

}fon: ICPMS4-C_190207A:

99 75 ', 125

Run: ICPMS4-C.:_190207A · · .

0 .0

Run: JCPMS4~C_ 190207 A

115. 85 115 ..

ND - Not d~tecited at the reporting limit. :

:02/.07/19 .16:.00

02/07/19 16:04

:Batch, 5~092

02/07/19 16:43

02/07:/19 16.:4 7

02/07/19 17:01 :10.:. •N:

'02/07/19 17:06.

MDC - MirJimurri detectable concentration • ' N - The arialyte cqncentratlon W~S riot.sufficiently high to ~lcuia.te a:' RPO .for the serial dilution test·

. : s ~ ~pike recovery outside. o.f ;;idvisory limits.

~ .. ". "' : Trust.our People, Tru'sfour Data ..

ww1,~:ener9Y.lab.com . ---~--------· - . ' ... -·- . ,~

Client::· Homestake Mining Co

Project: Grants

: . ClA/QC Summary Re.port · Prepared by Casper, WY Branch ...

· . Biliirigs; MT. 800.735.4489 • Casper; WY 888.235.0515 · . Gillette, WY ~86.686J175 • Helena, M:f877.47~ .. 0711

Report Date: _02111119

Work Or~er:· C:19010089

Analyte • • Courit:. · · Result Units RL %R.EC • Low Limit High: Lin,it : RPD RPDLiinit.: . Clual

Method: . SW6020

:Lab ID: QCS

Vanadium

·Lab ID: ICSA .

Vanadium

Lab ID::. · ICSAB

. Vanadium.

•: Method: SW6020 ...

Lab ID::. : MB~~3092

Vanadium··

Initial :Calibration Verification Standard·:. 0.0502 mg/L .. : . 0.010

lnterference,Check Sample A .

-b.00192 mg/L : 0.01 b

· · · • liit~rference Chec_k Sample AB . : . 0.0176 .. mg/L 0.010

· Method Blank

.. ND mg/filter : . . . 7E-05 .. :

100 90

. . Analytical Run: ICPMS4~C~ 190208A

: ·::: 02/08/19 16:57

Ho . . --·-

. 02/08/19 17:02

02/08(1917:07

Run: ICPMS4-C_190208A .

Batch: 53092 . ·:

02/0811917:45

RL -Analyte:reporting limit. ND - N_ot de.tected at the reporting limit. :

MDC - rviin/mum•detectable concentration •.

PaQe 20 of 24 :

: Trustour People, TrustoilrData. . . . . : l!iliin·gs; MTBD0.735.4489 -~ Casper:wv 888.2~5.0515 · .. \VWw,energylab.com , Gillette, WY 866;686.7175 • Helena, MT8l7;472;0711

. · ClA/QC Surnit.-ary Report: ' Prepared by. Caspet: ViJY Branch .

Client: • Homestake_ Mining Co

: : Prcij~ct: Grants

Analyte Count· . Result Units .. :

· · · Method:· E903:o. ·

Lab IP: C19010089~003.A:MS

Radium 226

Lab ID: C19010089-00~AMSD

·. Radium 226

Lab ID::: · LCS~53091

Radium226 ·

·: Lc!blO: MB-530.91 .. • •

Radium 226. :

. . .. Radium 226 precision (±) .

. : . Radium 226 MDC

· :Qualifiers: · RL -Analyte reporting limit.

Sample Matrix Spike

1.1 OE-06 pCi/L .

· Sample Matrix:Spike Duplicate .

1 ;23E~06. • • . pCi/L

• ~aboratory Contror Sample. .

. . 102. pCi/L•

3 Method. Blank · ..

0.6 pCi/L

0.2 pCi/L : .

0.2 pCi/L

MDC - Minimum detectable concentration : . ·

Report Date: 02/08/19 •

Work Order: C19010089

RL %REC Low Limit High Limit . RPO RPDLimit . Qual

Run: TENNELEC-3_ 190116B

77 . . 70 . 130 .

Rufi: TENNELEC-3_J90116B

86 . : 70. 130

Rufi: TENNELEC-3_ 190116B . 101 80. · : 120 .

Run: TENNELEC-3_ 190116B

' ND - Not detec;;te.d a"t the reporting limit.

.11

Batch: 5309.1 ·

: :: 01/22/1917:31:

. 01/22/19 17:31

· •: .. 20

01/22/191-7:31

· 01/22/19 17:31 •.

PaQe 21 of 24

..

~!': · Trust.our People. Trusloi.lr Data •. EN:RGY ""1..i>..13oR4TQRT~ ~ ivww,energxlab.com . ==========

. iiiliin·gs; MTS00.7.35.4489 • Casper:wv 888.2~5.0.515 Gillette, WY 8.66.6863175 • Helena, Mr:877;412;0711

· ·: QAiQC Summa·· Re ort-. .. .. .. ry p .. Prepared by Casper, WY Branch .

Client: • . Homestake. Mining Co··

: Project: Grants

Analyt~ · Count · Result Units . ·

Method:· Esos:o Lal:ilP: MB-53091

Thorium 230 :

Thoriuni 230. precision (±) .. Th9rium 230 MDC ...

Lab ID:. LCS-53091 .

Thorium 230 •• : .

Lab ID: C19010089,002AMS ' . . . . .

. : ·Thorium 230

..

3 Method Blarik

0.2 pCill

0.2 pCi/C ().~ : ·: pCi/L

Laboratory Control. Sample . ·

49.7 pCi/t

Sample Matril(Spike

6:88E.:6't . pCi/L

Lab ID: : . . C19010089-002AMS0. : : : Sample Matrix Spike Duplicaie

. Thorium 230 7,501::-07 pCi/L

. Qualifiers:

RL - Analyte repO:rting limit.

MDC - Minimur\1 detectable concentration :

: • .Report Da_te.:. 02/08/1 9 • • · ·

Work Order: C19010089

RL %REC Low Limit High:Limit • · RPO RPDLiinit.: .dual

Run: EGGcORTEC_190128B

· · · · Run: EGG~QRTEC...:,1901288 .

.. 10() ::: . 80 : 120 .•

Run: EGG-dFff.EC_190128B .106. .. 10••:. 130 .

Batch:·s3091.

: · · · .. 02/06/19 06:50. :U .

02/06/19 06:50

. . 02/06/19 06:50

· · Ruri: EGG-ORTEc:_ 19012as• 02/06/19 06:50

114 . · 70 130 8.5: .. · 20

.. ND- Nqt detected at the reporting limit.

U NoO:letected.at minimum detectable concentration

Pa1;1e 22. of 24 ..

Trust our People. Tni~ o)J~ Data. www.energylab.corn : ·

Wotl( Order Receipt Checklist

H.omestake Mining Co

. Login completed:by: Mark E. Traider

Re\iie\Ned by:

ReVieweid Date:

Kasey Vi dick

1/4/2019

Shipping container/cooler in good condition?

Custody seals intact on aHshipp[ng container(s}/cooler(s)? • :

·. • Custody seals intact on allsample bottles?

Ch~in ()f custody present?

· Chain of custody signed when. relinquished and received?

.. : chain o_f custody agrees with sample lab~ls~ .

Sarnplei; in prpper container/bottle? • · ·

· : Sample containers intact? ..

Sufficient salliple volume for indicated tes.t'.? ' ....

.All samples received within holding time? · · · ·(Exclude analyses that.are considered field parameters · · '$\JCh as pH, DO, Res CJ, •S:Ulf\te, Ferrous Iron; etc.): ·

. . . . . . - '

Temp ~lank_ received in all shipping contain~r(s)/cooler(s)?

: . : ·Container/Temp Blank temperature:

Wat_er - VOA_ vials have ·zero headspace_?. •

Water ~•r:Macceptable upon receipt?·: : ·:::

·· Yes 0

·:·Yes•

Yes D.

Yes0

Yes 0-

'" Yes 0·

yes:0

Yes 0

Yes@

·=Yes0

Yes

17.9°C Noice.

Yes_O·

·•ves•

, . · Billings, MT 800.735.4489 ··casper.WY 888.235.0515 . . Glli~tte, WY 866.686.717.5" ll~lena, MT 877 .472.071 f

· .... -· -G19010089 . '

Date Receb1ed: J°/4/2019

___ R~ceived by: tlh. . , .

Carrier name: NDA

NoD

Nci

::_NoD

NoO.

NciD

NoD

NoD.

·NoD

NoD

No

No

. Not Present D. ' '

Not _Pre_sent 0 · ·

: :Not Pre·sent

· :·:. NotApplicable D:: ·

· . NoVOA vials submitted 0 .. No.O

No : · • • : Not _Ap~licable : :0 : . . . . . . _______________ ... ___________ ... _ .. ___________________________________________________ ,. ________________ .,. _____________________ .,. _________ ........... ,

. '.'' ------------- .. -. '. - . ' .. - '------------- . ·- . -- '·- .. , -------------·' -· .. -..... '------------- '·- , . ·- . , . , .. -------------·. -... -' .. '' '----· Stan~ard Reporting Procedures:

. . . . . : Tab measurement ofanalytes considered field parameter~ th~t r~quire analysis withinJ 5 minutes of s,ahipling such as

: · • pH, Dissolved Q'xygen and Residua[ Ch_loriiie_, are qualified as beihg analyzed outsid_e of:recommended holding time. . . ' . '

Solid/s.oil $.,lmples are report~d o.n. a wet weight basis (as received} Li1:1les.s s.pecifically indicated. If moisture corrected; •.: ·. data units are typically noted as -dry: For.agricultural and mining soil parameters/characteristics, all samples are dried·

'' • ': and ground pr1or: to sc1rnple analysis. ' ' . . . . ' . ' ' ' ' . '

. . . ' ... . Contacfand Corrective Action.Comments:=·

• None

Page 23:of24 ·

,,sawremJ Chain of Custody & Analytical Request Record Trust our People.1rus1 our Data, www.energyfab.com

Account Information (Billing information) Repo rt I f f n orma IOn (ifd/fferentthanAccountlnformation)

Company/Name /./om tSh::..kc. Company/Name

Contact ...

- "' A l

Phone Phone c...,,· P(\- ' \...-Malling Address ,Malling Address ../

City, State, Zip

Email

DErnail Receive Report OHard Copy DEmail Special Report/Formals:

D LEVEL IV D NELAC O EDD/EDT (contact laboralory) D Other

Proiect Information Matrix Codes Anal 1sis Requested '

Project Name, PWSlD, Permit, etc. 6-R ANT.S A· Air 0 I w. Water ~ "' ,0 Sampler Name J?vte:. Mo..-n~ 1:.. Sampler Phone I· 5oS· J&'t· lbOh Soils[ '"b " ~ S- ·;:, Solids ~

l'-'M V• I,;"

~ \)' Sample Origin State EPA/State Compliance DYes DNo Vegetation

~ '.:t C' B· Bioassay I\( ~ URANIUM MINING CLIENTS MUST Indicate sample type.

. 0- Olher :s D NOT Source or Byproduct Material D Source/Processed Ore (Ground or Relined) .. CALL BEFORE SENDING DW· ~,::'g

' ..... D 11e.(2) Byproduct Material (Gan ONLY be Submitted to ELI casper Location) ....... .......

~ -l 4! -i! . Sample Identification Collection Matrix f~ Nutnberof \~ 1.E ~ (Name, Location, lnteival, elo.)

1 ftMC- I 2 HMc - IA 3 lfM (, - ;l 4 1-1-1-1c.~3 5 HMC-l/ 6 HM'--S 7 1-f pt c.. - l:, 8 H Ml. - "'f 9

10

Cuskldy Relinquished by (pllnt)

Record MUST J..ti r l\ne L be !iilgned Relinquished by (print)

\ '• ~' .

Shipped By Cooler ID(s)

• ' <' ' • ' .: •• ~~

Custody Seals Y N C 8

Date Time Containers

~

1/fh OrK

' :JC> 18'

I

COMPO! IT£

I

. ,., V

- • :· le;,,r: .~ ', ' '"""

Intact y N

Receipt Temp ·c

(SeeCOdes Abo,el

X x. X X X X ){ X )l X X X X X y X x )( )C X )(. X X )(

X X X >< X ~ X )(

I

(print)

'l .. - •.

cc

Page_\_of (

C omments

~~ l i?3Jj 35g ~'1 S"G.~'7 5¥1~

See A,·r \Jo l~vVteS.

,3e fovl.

All turnaround times are standard unless marked as

RUSH. Energy Laboratories

MUST be contacted prior to 't, RUSH sample submittal for Cl)

charges and scheduling -.c u See Instructions Page m i:: • < Cl) .. · "·· . ., :t;Lt;liAEfU,"JM · ,. .. QI

U) RUSI! =-~~:: ~;~. :-,:: •, V,~::: TAT

l.':i/E r II 1.'-/(p e r- J (

/, 4<t £ t- I/ /, </? ··€ r- II ,. '-15 £ r I/

/.45£ +- II t. 4'f E +- 1 I J.JlA

-C../'tt:)/OOKY

In certain circumstances, samples submitted to Energy Laboratories, Inc. may be subcontracted to other certified laboratories in order to complete the analysis requested. This serves as notice of this possibility. All f{l" ·": ·1tracted data will be clearly notated on your analytical report. w-eoc-10/ts v.3