42D09NE8M4 6 3.4721 PIC 010 REPORT ON THE VLF EM SURVEY AND ROCK SAMPLIN3 PROGRAM FOR TRl-STAR RESOURCES LIMITED Pic and Lecours Townships, Ontario by lan Coster, B.Se. Robert S. Middleton Exploration Services Inc. P.O. Box 1637 TIMMINS, Ontario P4N 7W8 September, 1985
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42D09NE8M4 63.4721 PIC010
REPORT ON THE
VLF EM SURVEY
AND ROCK SAMPLIN3
PROGRAM
FOR
TRl-STAR RESOURCES LIMITED
Pic and Lecours Townships, Ontario
by
lan Coster, B.Se.
Robert S. Middleton Exploration Services Inc.P.O. Box 1637
REVISIONS ROBERT S. MIDDLETON EXPLORATION SERVICES INC.
TR1-STAR RESOURCES
Title
REGIONAL GEOLOGYFIGURES
Dale:NOV. 63A. W
N.T.S.: ^2 D/B: u-zt
- 5 -
property by the Heron Bay Pluton, a massive porphyritic
(plagioclase) biotite-hornblende granodiorite. The northern
portion of the Tri-Star property is intruded by the Gowan Lake
Pluton, a massive porphyritic (microcline) biotite-hornblende
quartz monzonite.
The metavolcanic and metasedimentary rock units are
generally well foliated in texture, with lapilli within the
pyroclastic units stretched and flattened parallel to foliation
at about 6:1 (long axis: width). Narrow felsic layers within
intermediate and mafic units are often boudinaged parallel to
foliation.
Minor carbonate alteration occurs in fractures as calcite,
together with minor manganese and hematite stains.
VLF BM
Procedure and Instrumentation
The VLF EM survey was carried out using two EM-16 units
manufactured by Geonics Ltd. (Specifications are included in the
appendix). In phase and quadrature readings were measured using
Cutler, Maine (NAA) as a transmitter. Transmissions were at a
frequency of 24.0 khz. Readings were taken at 20 m intervals
along lines spaced 120 metres apart. All readings were taken
facing north.
Statistics
The VLF EM survey was conducted between August 23-29, 1985,
in the field by two operators from Rayan Exploration Ltd. (Ray
- 6 -
Meikle, Bryan Belanger). A total 42.42 Ion of line were surveyed
resulting in 2121 readings.
Interpretation
Anomalies obtained with the EM-16 equipment can be divided
into two categories:
Type "A" - those in which the quadrature is opposite in sign to the in-phase (negative quadrature) and indicates a strong phase shift due to the overlying conductive overburden. Type "A" conductors are typically due to sulphides, graphite or very strong shears.
Type "B" - those in which the quadrature follows the in-phase (positive quadrature) and indicates a poorly con ductive source such as overburden, faults or shears.
The above separation depends on the conductivity-thickness
of overburden. Consequently, in the absence of overburden, Type
"B" anomalies could represent strong VLF conductors. Therefore
the Type "B" anomalies should be examined in the absence of
overburden.
It should also be noted that weakly pyritized shears and
formations, often of value in gold exploration, usually give rise
to the Type "B" response.
A total of 20 conductors (lettered A to T inclusive, see
Fig. 6 fc 7) have been interpreted from the data. The axes of the
conductors generally strike ENE, E-W or ESE and these directions
are conformable to the geologic trend.
Conductor A is 1440 m long, trending ENE between L 840E and
E-W between L 1560 and L 2280E. This conductor displays a
moderate in-phase response with a corresponding moderate negative
quadrature (type "A" anomaly). The conductor correlates with the
- 7 -
contact between unit Ir and 1m in its ENE trend, and with a long
linear swamp in its E-W trend.
Conductor B is 240 m long, trending ENE between L 1560E and
L 1800E. This conductor displays a moderate in-phase response
with little attendant quadrature response (type "B" anomaly) and
is probably due to overburden/swamp effects.
Conductor C is 600 m long, trending E-W between L 1080E and
L 1680E. This conductor is a weak and discontinuous type "B"
anomaly and may be due to a slightly elevated background content
of disseminated pyrite.
Conductor D is 480 m long, trending ENE between L 1680E and
L 2160E. This conductor displays a moderate to strong in-phase
response with weak positive quadrature (type "B" anomaly). The
western half of this conductor axis is weaker and is probably
caused by a swampy beaverpond and creek, while the eastern half
of the conductor axis may be due to a slightly elevated
background content of disseminated pyrite.
Conductor E is 720 m long, trending E-W between L 2160 and L
2880E. This conductor displays a moderate in-phase response with
a moderate positive quadrature response (type "B" anomaly). The
axis roughly parallels, and is probably due to the contact
between units 1m and 3d.
Conductor F is 340 m long, trending E-W between L 2780E and
L 3120E. This is a weak type "B" conductor that corresponds to
the contact between units 1m and Ir.
Conductor G is 340 m long, 100 m south of conductor F, and
8
trends E-W. This is a weak type "B" conductor that may be due to
a slightly higher diseminated pyrite content.
Conductor H is 600 m long, trending ESE between L 2520E.
This conductor displays a weak in-phase response near L 2520E and
a strong in-phase response near L 2880E, with corresponding
moderate negative quadratures (type "A" anomaly). The conductor
correlates with a long linear swamp, and may be the eastern
extension of conductor A.
Conductor I is 340 m long, trending NE between L2780 and L
3120E. This conductor is a weak type "A" anomaly that may be
caused by a weak struture (fault or shear) in the granodiorite.
Conductor J is 240 m long, trending ENE and ESE between L OE
and L 240E. This conductor displays a moderate in-phase response
with li tt lw attendent quadrature response (type "B" anomaly).
The conductor parallels, and is probably due to the contact
between units 1m and Ik.
Conductor K is 120 m long and is probably two weak, single
point anomalies (type "B"), caused by a linear swamp and creek.
Conductor L is 240 m long and is a weak type "B" conductor,
that is probably caused by a creek.
Conductor M is 120 m long and is a weak type "B", caused by
the same creek as conductor L.
Conductor N is 120 m long, trending ESE between L 480E and L
600E. This conductor portrays a weak to moderate in-phase
response with little corresponding quadrature (type "B" anomaly).
This conductor parallels conductors L and M, and may reflect a
- 9 -
weak structure (fault or shear).
Conductor O is 240 m long, trending ESE between L 480E and L
720 E. This is a weak type "B" conductor that parallels
conductors L, M and N, and may reflect a weak structure (fault or
shear).
Conductor P is a weak type "B" anomaly across two lines, and
it is probably due to conductive overburden.
Conductors Q, R, S and T are weak, type "B", single point
anomalies that are probably caused by overburden affects.
Rock Sampling Program
Procedure and Statistics
"Die Rock Sanpling program was carried out by the author. A
total of 102 samples (numbered TS-01 to TS-103, omitting TS-61)
were collected from outcrops exposing both mineralized, or
altered material, as well as fresh bedrock. The samples were
analyzed for Au, Ag, Mo, Sb, As, Cu, Zn, and Ba at Barringer
Research Ltd. of Rexdale, Ontario. The following table describes
and gives the locations of the samples.
- 10 -
TABLE l
Sample No.
TS - 01
TS - 02
TS - 03
TS - 04
TS - 05
TS - 06
TS - 07
TS - 08
TS - 09
TS - 10
TS - 11
TS - 12
TS - 13
TS - 14
TS - 15
TS - 16
Location
L1200E/720N
L1200E/730N
L1200E/772N
1185E/860N
1180E/965N
L1195E/1050N
L1320E/1020N
L1320E/928N
1315E/700N
1290E/280N
1580E/710N
1560E/745N
5m W of TS-12
1552E/790N
1560E/830N
L11560E/855N
Description
Quartz vein; clear-glassy; rusty fractured; trace pyrite; not in place
Rusty weathering metasediment
2 inch wide felsic interbed in metasediment; weakly sericitic; trace pyrite
Rusty weathering volcanoclastic
Grey-brown coarse grained aplite dikelet
Coarse aplite with 31 coarse biotite and trace specks pyrite
"baked" agmatized metasediment
Grey-brown fine grained biotitic meta sediment
Intermediate tuff with siliceous bands
Mafic tuff breccia with hematized and epidotized lapilli
Quartz sweat in (1m); fine grained granular white
Rusty intermediate tuff; rusty parallel to foliation; trace pyrite
as above
Felsic interlayer in intermediate tuff
Rusty and Mn-stained intermediate crystal tuff
3 inch wide interlayer of grey felsic material in intermediate tuff
None of the samples were considered anomalous in Au, Ag, Cu,
Zn, and of the 19 samples (above) considered anomalous in
indicator elements, none are multi-element anomalies (more than
one element anomalous in the same sample). Also, of the above 19
anomalous samples, all are considered only weakly anomalous
except for TS-29 and TS-69.
TS-29 is moderately anomalous in arsenic (21.1 ppm). It
should be noted that greater than 50 ppm As is considered
anomalous at the Hemlo gold deposits.
TS-69 is moderately to strongly anomalous in barium (8220
ppm). However, wihin the "Hemlo camp", it is not unusual to have
highly anomalous barium values scattered within volcanoclastics
and metasediments, with no accompanying mineralization or
alteration. This may be caused by the mechanical weathering of
barium-feldspar, rather than the formation of barite.
OONCUJSIONS AND REOCMVIEEDATIONS
Although 20 VLF-EM conductors of variable strike length and
strength were defined on the property, none of them have been
interpreted to be directly caused by an appreciable sulphide
- 20 -
content within underlying geology. Anomalies outlined by IP
surveying in 1983, are weak and do not correlate with the VLF
conductors outlined in this report.
Of the 102 rock samples collected from outcrops on the
property, none are considered anomalous in gold, but 19 are
considered anomalous in indicator elements.
In light of the fact that none of the VLF-BW conductors
correllate with the existing weak IP anomalies (obtained in
1983), and that none of the rock samples returned anomalous in
gold, no further work is recorrmended at this time.
Respectfully Submitted
lan Coster B.Se.
REFERENCES
- 21 -
Colvine, A.C. editor 1983
Coster, I., N. Caira, 1983
G.S.C. - O.D.M.
Milne, V.G. 1967
Muir, T.L. 1982
Muir, T.L. 1982
Thomson, J.E. 1931
The Geology of Gold in Ontario, Ontario Geological Miscellaneous Survey Paper 110, Ministry of Natural Resources, Ontario.
Geological, Magnetometer and I.P.-Resistivety Survey of the Tri-Star Resources Limited Property.
Aeromagnetic Map, 2156G
Geology of the Cirrus Lake - Bamoos Lake Area, District of Thunder Bay, Ontario Department of Mines, Geological Report 43.
Geology of the Hemlo Area,District of Thunder Bay,Ontario Geological Survey Report 217, 65p.Accompanied by Map 2452, Scale 1:31680.
Geology of the Heron Bay Area,District of Thunder Bay,Ontario Geological Survey Report 218, 89p.Accompanied by Map 2439, scale 1:31680.
Geology of the Heron Bay Area, District of Thunder Bay, Ontario Department of Mines, Ann. Rept., Vol. XL, part II.
CERTIFICATION
l, IAN P.O.A. COSTER, B.Sc., of Tinmins, Ontario, certify
that:
1) I am a graduate of the University of British Columbia, Vancouver, B.C., with a B.Sc. degree in Geology obtained in 1981.
2) I have been practising my profession in Canada since1981.
3) I have no direct or indirect interest in the properties, leases or securities of TRI-STAR RESOURCES LIMITED nor do I expect to receive any.
Dated this September 1985,Tiimrins, Ontario.
IAN P.D.A. COSTER, B.Sc,
lw IZ la
l- IX
EM16 SPECIFICATIONS
MEASURED QUANTITY
SENSITIVITY.
PJESOLUT3ON
OUTPUT
OPERATIJ3G FREQUENCY
OPERATOR CONTROLS
POWER SUPPLY
DIMENSIONS
V7E1GHT
In-phase and goad-phase components of vertical magnetic field as a . percentage of horizontal primary field, (i.e. tangent of the tilt angle and ellipticity)." -
In-phase
Quad-phase 401.
f
Nulling by -audio tone. In-phase indication from jnechanical incline- . TTieter and quad-phase from a graduated dial.
15-25 kHz VLF TJadio Band. Station selection done by means of plug-in units.
On/Off switch, battery test push button, station selector switch, sudio volume control, quadrature d5al, inclinometer.
6 disposable 'AA 1 cells.
42 x 1 4 x Sem
Instrument: 1.-6 ^ Shipping : -4 . 5 3cg
GEONICS LIMITED2 Thorncliffe Park Drive, Toronto 17, Ontario, Canada. Tel.(416) 425-1821, Cables: Ceoni
VLF ELECTROMAGNETIC UNIT
Pioneered exclusively by Geonics Limited the VLF-method of electromagnetic surveying by utilization of the uniform horizontal fields generated by an existing network of reliable, fully operational Very Low Frequency trans mitting stations has proved to be a major advance in geophysical exploration.
Very extensive world-wide experience since the beginning of 1965 by a large and rapidly increasing number of users, including a high proportion of major mining and exploration companies, has provided conclusive evidence of the effective ness of Jthe technique and the EM 16 has gained general acceptance as a basic electromagnetic tool. This evidence has also indicated the response of dissemin ated bodies, to the VLF-method.
The unique self-contained EM 16 offers the unrivalled combination of LIGHT WEIGHT, ONE-MAN OPERATION and DEEP PENETRATION allowing rapid, economical surveys. Assessing the data is simplified due to the use of the uniform horizontal primary field. The patented design feature of the measurement of both the in-phase and out-of-phase (quadrature) component of the vertical field provides the information necessary for comprehensive interpretation of the field results.
SPECIFICATIONS
Source of primary field:
Transmitting nations used:
Cperatin; frequency ranpe:
Parameters measured:
Method cf reading:
VLF transmitting nations.
Any desired nation frequency supplied with the instrument in the form of plug-in tuning units. Two tuning units can be plugged in at one time. A switch selects either nation.
About 15 -25 kHz
(1) The vertical in-phese component (tangent of the till angle of the polarization ellipsoid).(2) The vertical out-of-phase (quadrature) component the short axis of .the polarization ellipsoid compared to the long axis).
In-phase from t mechanical in clinometer; out-of-phase from B calibrated dial. Nulling by audio lone.
Scale range:
Readability:
Reading time:
Operating temperature range:
Power Supply:
Dimensions:
Weight:
Instrument supplied with:
Shipping weight:
In-phase ± 150X; Out-of-phase i 4054.
10 — 40 seconds depending on signal strength.
-40 lo 50CC
6 size AA (penlight) alkaline cells. Life about 200 hours.
16 x 5.5 x 3.5 in (42 x 14 x 9 cm)
2.5 ibs (1.1 kg)
Monotonic speaker, carrying case, manual of operation, 3 station selector plug-in tuning units (additional frequencies are optional), set of -baneties.
10 Ibs (4.5 kg)
Subsidiary of Deerinc Milliken Inc.
^^ 304 CARLINOVIEW DRIVE 3750 - 19TH STREET ^M REXDALE, ONTARIO SUITE 105
^ — ^^F M9W 5G2 CALGARY, ALBERTA
^BARRINGER MAGENTA ^^.^ S™, • C F ILE: T5.0584 A DATE: os/io/ss M MATRIX! Ad REG ^
V -,R, S. MIDDLETON EXPLORATION SERVICES (I. COSTER) PROJ! M-22
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TS-31TS-32TS-33TS-34TS-35
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- 304 CARLINQVIEW DRIVE 3750 - 19TH STREET ^^ REXDALE, ONTARIO SUITE 105
L ^ — I^B M9W 502 CALQARY, ALBERTA
j^ lJf\ l\l\l r\^JKl\ I'lAljlZJ.V LA (416)675-3870 (403)276-9701
A C F ILE! T5.0584 A M DATE! 08/10/85 M ^ MATRIX! AQ REG w
V ^R, S, MIDDLETON EXPLORATION SERVICES (I, COSTER) PROJ! M-22
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TS-56TS-57TS-58TS-59TS-60
TS-62TS-63TS-64TS-65TS-66
TS-67TS-68TS-69TS-70TS-71
TS-72TS-72TS-74TS-75TS-76
TS-77TS-78TS-79TS-80TS-81
TS-82TS-83TS-04is-oaTS-86
TS-B7TS-88TS-89TS-90TS-91
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HO NO! 85-0584 PAGE! A
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MAGENTA
304 CARLINQVIEW DRIVE REXDALE, ONTARIO M9W 502
(416)675-3870
3750 - 1STH STREET SUITE 105CALQARY, ALBERTA T2E 6V2 (403) 276-9701
FILE; T5.0584DATE: os/io/ssMATRIX: AG REG
c R, S, MIDDLETON EXPLORATION SERVICES (I. COSTER) PROJJ M~22 WO NO} 85-0584 PAGE:C SAMPLE
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