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PENDAHULUAN

A. JUDUL SKRIPSI

ANALISIS BIDANG KETIDAKMENERUSAN UNTUK

MENGANTISIPASI TERJADINYA KELONGSORAN BAJI PADA

LUBANG BUKAAN TAMBANG BAWAH TANAH DI D.O.Z PT.

FREEPORT INDONESIA COMPANY

B. ALASAN PEMILIHAN JUDUL

Massa batuan b!b"a "n#an $ban%a$an &at!'a( t$n'$. Massa batuan

b!s')at an's*t!*+ "an t'"a$ &n!us ,"'s$*nt'nu-. Ha(/a( %an# &&buat &assa

batuan an's*t!*+ a"a(a/ $a!na t!"a+atn%a b'"an#b'"an# $t'"a$&n!usan

,+(an *) "'s0*nt'nu't's- "a(a& &assa batuan.

B'"an#b'"an# "'s$*nt'nu a$an &n%bab$an "'st!'bus' t#an#an "a(a&

&assa batuan t'"a$ "'t!us$an1t!"'st!'bus' s0a!a &!ata $ s#a(a a!a/2 "an

s0a!a $s(u!u/an s')ats')at (ast's batuan b!uba/.

Pn##a('an untu$ +&buatan t!*3*n#an &n#a$'bat$an $s'&ban#an

&assa batuan t!#an##u2 s/'n##a batuan "'s$'ta! +n##a('an t!sbut a$an

!untu/ a+ab'(a batuan 'tu t'"a$ &a&+u &n%an##a bbann%a sn"'!'. K!untu/an

t!*3*n#an 'n' b'sa "'a$'bat$an $a!na a"an%a b'"an#b'"an# "'s$*nt'nu'tas %an#

a"a "' s$'ta! t!*3*n#an2 sbab +a"a "asa!n%a b'"an#b'"an# "'s$*nt'nu'tas

a"a(a/ b'"an#b'"an# (&a/. K!untu/an %an# t!4a"' a$'bat "a!' a"an%a b'"an#

"'s$*nt'nu'tas a"a(a/ !untu/an1(*n#s*!an ba4' ,3"# )a'(u!-.

Da!' +n4(asan "' atas &a$a +!(u a"an%a suatu ana('s's tntan# b'"an#

$t'"a$&n!usan %an# nant'n%a b!tu4uan untu$ &n#ta/u' $&un#$'nan

t!4a"'n%a $(*n#s*!an ba4' "an 0a!a +nan#anann%a.

Untu$ &(a$u$an +n('t'an 'n' +n('t' a$an &n##una$an +!*#!a&

$*&+ut! ,s*)t3a!- untu$ &&+!&u"a/ s!ta &n4a&'n $a$u!atan "an

$t('t'an "a!' /as'( %an# a$an "'"a+at. A"a+un +!*#!a& %an# a$an "'+a$a' %a'tu 5

6. CLASSE7 5 untu$ +n#$(as')'$as'an &asa batuan "n#an &t*" RMR.

8. DIPS "an ROCKWORK 9:: 5 untu$ ana('sa b'"an# $t'"a$&n!usan.

;. UNWEDGE 5 untu$ ana('sa $a!a$t!'st'$ $(*n#s*!an ba4' "an &nntu$an

baut batuan %an# ssua' untu$ &nan#an' (*n#s*!an %an# &un#$'n t!4a"'.

C. TUJUAN PENELITIAN

Tu4uan %an# 'n#'n "'0a+a' "a(a& +n('t'an 'n' a"a(a/ untu$ &n#ana('sa

suatu 4a!'n#an b'"an# $t'"a$&n!usan +a"a suatu (uban# bu$aan2 $&u"'an "a!'

/as'( ana('s's 'n' a$an "' "a+at +a!a&t!+a!a&t! "'&ana suatu "a!a/ "a(a&

(uban# bu$aan 'tu b!+*tns' &n#a(a&' $(*n#s*!an ba4' %an# "'a$'bat$an *(/

b'"an#b'"an# $t'"a$&n!usan ta"'.

Pn('t'an 'n' 4u#a a$an b!(an4ut sa&+a' 0a!a +nan##u(an#an

$(*n#s*!an ba4' t!sbut2 "a(a& /a( 'n' a$an "'+a$a' s'st& baut batuan ,!*0$

b*(t-.

D. RUMUSAN MASALAH

6. Mn#ta/u' sb!a+a bsa! +n#a!u/n%a suatu 4a!'n#an b'"an#

$t'"a$&n!usan +a"a suatu (uban# bu$aan t!/a"a+ t!4a"'n%a

$(*n#s*!an ba4'.

8. Mnntu$an "a!a/"a!a/ &ana %an# b!+*tns' t!4a"' suatu $(*n#s*!an

ba4' %an# "' +n#a!u/' *(/ b'"an# $t'"a$&n!usan.

;. M&+(a4a!' $a!a$t!'st'$ "a!' $(*n#s*!an ba4' %an# $&un#$'nan t!4a"'

untu$ $&u"'an &nntu$an 4n's baut batuan %an# ssua' "' t'n4au "a!'

s#' $*n*&' "an s#' )a$t*! $a&anann%a.

BAB II

ANALISIS MASALAH

A. DASAR TEORI

A.1. Bidang Ketidakmener!an

B'"an#b'"an# $t'"a$&n!usan %an# a$an san#at &&+n#a!u/' "a!'

t!4a"'n%a suatu $(*n#s*!an ba4' "a(a& suatu (uban# bua$aan a"a(a/ < $$a!

,4*'nt-2 ssa! ,)au(t-2 "an +!('+atan ,)*("'n#-. Stu$tu! $$a! a$an ban%a$ "' 4u&+a'

"a(a& suatu (uban# bu$aan2 &a$a "a!' 'tu +!(u "'a"a$an suatu ana('sa untu$

&nntu$an $"u"u$an1a!a/ "a!' $$a! t!sbut.

Untu$ &(a$u$an suatu ana('sa b'"an# $t'"a$&n!usan "'#una$an

&t*"a stat'st'$. Mt*"a stat'st'$ a"a(a/ suatu &t*" %an# "'t!a+$an untu$

&n"a+at$an $'sa!an /a!#a !ata!ata atau /a!#a &a$s'&u& "a!' s4u&(a/ "ata

a0a$ satu 4n's st!u$tu!. Da!' &t*" 'n' &a$a "a+at "'$ta/u' $0n"!un#an

$0n"!un#an2 bntu$ +*(a atau+un $"u"u$an u&u& "a!' 4n's st!u$tu! %an#

s"an# "'ana('sa. Mt*" stat'st'$ t!"'!' "a!' "ua &t*" %an#

+n#(*&+*$ann%a "'"asa!$an atas ban%a$n%a +a!a&t! %an# a$an "'$ta/u'

/a!#a stat'st'$n%a2 %a'tu 5

6. Mt*" stat'st'$ "n#an satu +a!a&t!

8. Mt*" stat'st'$ "n#an "ua +a!a&t!

A.6.8. Mt*" stat'st'$ "n#an satu +a!a&t!

Da(a& &t*" 'n' +a!a&t! atau "ata %an# "'u$u! /an%a t!"'!' "a!' satu

unsu! +n#u$u!an. Jn's "'a#!a& "a!' &t*" 'n' a"a(a/5

6. D'a#!a& $'+as

8. D'a#!a& !*st

;. H'st*#!a&

A.6.8.6. D'a#!a& $'+as

Tu4uan "a!' +&buatan "'#!a& 'n' a"a(a/ untu$ &n#ta/u' a!a/

$(u!usan u&u& "a!' unsu!unsu! st!u$tu! %an# "atan%a /an%a satu unsu!

+n#u$u!an sa4a ,"ata ba!'n#-. Data"ata +n#u$u!an "'&asu$$an "a(a& suatu

tab( s/'n##a &&+!&u"a/ "a(a& +&buatan "'a#!a&.

Ga&ba! 8.6

Ana('s's D'a#!a& K'+as

A.6.8.8. D'a#!a& !*st

Tu4uan "a!' +&buatan "'a#!a& !*st a"a(a/ untu$ &n#ta/u' a!a/

$(u!usan u&u& "a!' "ata"ata "n#an satu +a!a&t! 2&'sa(n%a ba!'n#. Data

"ata ba!'n# 4u#a "'&asu$$an "a(a& tab( untu$ +&buatan "'a#!a& !*st.

Ga&ba! 8.8

Ana('s's D'a#!a& R*st

A.6.8.;. H'st*#!a&

Tu4uan "a!' ana('s's /'st*#!a& a"a(a/ untu$ &n#ta/u' a!a/ $(u!usan

u&u& "a!' unsu!unsu! st!u$tu!.

Ga&ba! 8.;

Ana('s's H'st*#!a&

A.6.;. Mt*" stat'st'$ "n#an "ua +a!a&t! ,"'a#!a& $*ntu!-

Mt*" 'n' "'t!a+$an untu$ "ata"ata st!u$tu! %an# &&'('$' "ua unsu!

+n#u$u!an s+!t' +a"a st!u$tu! #a!'s ,"atan%a t!"'!' "a!' Ba!'n# "an P(un#-2

atau st!u$tu! b'"an# ,"atan%a t!"'!' "a!' St!'$ "an D'+-. C*nt*/ "a!' &t*" 'n'

a"a(a/ "'a#!a& $*ntu!. D'a#!a& 'n' +&buatann%a "'"asa!$an +a"a +!'ns'+

+!'ns'+ +!*%$s' st!*#!a)' "an +!*%$s' $utub. Tu4uan "a!' "'a#!a& 'n' a"a(a/

untu$ &n"a+at$an /a!#a $!a+atan ,"ns'tas- &a$s'&u& "ata"ata %an#

"'ana('sa2 s/'n##a "a!' "a+at "'$ta/u' *!'ntas' atau $"u"u$an u&u& st!u$tu!

%an# "'ana('sa.

Ga&ba! 8.=

,a- Pn#+(*tan "ata"ata +n#u$u!an $$a! ta!'$ "' atas 4a!'n#>P*(a!E?ua(A!a(@

,b- Mnntu$an +usat+usat t't'$ $!a+atan "' atas 4a!'n# >Ka(sb$@

Ga&ba! 8.

,a- Pna!'$an $*ntu! $!a+atan +a"a "'a#!a& $*ntu!

,b- D'a#!a& $*ntu! %an# "'/as'($an

A.6.=. Ana('s's Dn#an P!*#!a& DIPS "an R*0$W*!$ 9::

Dn#an &n##una$an $"ua +!*#!a& 'n' a$an &&u"a/$an "an (b'/

a$u!at "a(a& &(a$u$an ana('sa b'"an# $t'"a$&n!usan2 s!ta a$an

&&+!'n"a/ "a(a& +n%a4'an /as'( "a!' ana('sa. Data"ata %an# "'"a+at

"'(a+an#an ,b!u+a St!'$ "an D'+- $&u"'an "' 'n+ut $ "a(a& $*&+ut! &a$a

a$an "'/as'($an #a&ba!an /as'( ana('sa s+!t' "' ba3a/ 'n'.

Ga&ba! 8.

Ana('s's D'a#!a& R*st ,ROCKWORK 9::-

Ga&ba! 8.

Ana('s's H'st*#!a& ,ROCKWORK 9::-

Ga&ba! 8.

Ana('s's D'a#!a& K*ntu! ,DIPS-

A.". L#ng!#ran Ba$i %&edge 'ai(re)

L*n#s*!an ba4' "a+at t!4a"' +a"a suatu batuan 4'$a t!"a+at (b'/ "a!' satu

b'"an# (&a/ %an# bbas "an sa('n# b!+*t*n#an. Su"ut +!+*t*n#an anta!a

b'"an# (&a/ t!sbut /a!us (b'/ bsa! "a!' su"ut #s! "a(a& batuann%a. B'"an#

(&a/ 'n' "a+at b!u+a b'"an# ssa!2 !$a/an &au+un b'"an# +!(a+'san.

Ca!a (*n#s*! suatu ba4' "a+at &(a(u' sa(a/ satu atau bb!a+a b'"an#

(&a/n%a2 atau+un &(a(u' #a!'s +!+*t*n#an $"ua b'"an# (&a/n%a. Da(a&

ana('s's "n#an &t*" H*$ "an B!*3n (*n#s*!an ba4' "'an##a+ /an%a a$an

t!4a"' +a"a #a!'s +!+*t*n#an $"ua b'"an# (&a/.

CONTOUR

SCHMIDT POLECONCENTRATION* #+ t#ta( ,er

1.- * areaMinimm C#nt#r 1 ./C#nt#r Inter0a( 1./M a .C#n 2e ntr ati# n 3 .- 4

E5UAL AREALO&ER

116 P#(e! P(#tted1-7 Data Entrie!

ANALISIS DATA

8UDHA "39N#09--

A.8.6. Ana('s's "n#an +!*#!a& UNWEDGE

Has'( "a!' ana('s's b'"an# $t'"a$&n!usan "a!' +!*#!a& DIPS b!u+aa!a/ "a!' bb!a+a st 4*'nt atau a!a/ u&u&n%a2 s+!t' +a"a #a&ba! 8.:.

Ga&ba! 8.:

A!a/ u&u& "a!' b'"an# $t'"a$&n!usan

K&u"'an "a!' $t'#a st b'"an# $t'"a$&n!usan t!sbut "''n+ut $"a(a&

+!*#!a& UNWEDGE 2 $&u"'an +!*#!a& a$an &na&+'($an (*$as' "an "'&ns'

"a!' (*n#s*!an ba4' "a!' ata+2 (anta' "an "'n"'n# ,Ga&ba! 8.6-.

MAJOR PLANES

ORIENTATIONS: TREND;PLN<.1 "16;61

" 6"4;1=

6 -4=;6>

E5UAL AREALO&ER

11" P#(e! P(#tted1-4 Data Entrie!

Ga&ba! 8.6

L*n#s*!an ba4' %an# t!4a"' "' ata+2(anta' "an "'n"'n# %an# "'sbab$an $a!na

$t'#a st b'"an# $t'"a$&n!usan +a"a #a&ba! 8.:

Da!' $&+at (*n#s*!an ba4' "'atas 4u#a a$an &n#/as'($an *ut+ut b!u+a t*nas

(*n#s*!an %an# t!4a"'2 a!a/ (*n#s*!an s!ta )a$t*! $a&anan2 s+!t' +a"a tab( I.

Ta?e( I

Karakteri!tik L#ng!#ran 8ang Mngkin Ter$adi

Wedge Weight-tones Failure mode Factor ofsafety

Roof wedge 13 Falls 0

Side wedge 1 3.7 Slide on J1/J 0.3!

Side wedge 3.7 Slide on J3 0."

Floor wedge #3 Sta$le %

A.8.8. Pnan#anan (*n#s*!an ba4' "n#an Baut Batuan ,R*0$ B*(t-

Baut batuan "'+an"an# sba#a' suatu s'st& +n%an##a %an# &&+un%a'

8 &'s' $(as'$2 %a'tu 5

Mn%an##a batuan %an# +*tns'a( utnu$ !untu/

Mna/an atau ba/$an &n#/nt'$an +!+'n"a/an +!&u$aan (uban# batuan

Fun#s' %an# b!/ubun#an "n#an $"ua /a( 'n' a"a(a/ 5

6. Fun#s' Pna/an ,Sus+ns'*n-

8. Fun#s' Pn$an

;. Fun#s' Pn#uat ,R'n)*!0&nt-

Jn's baut batuan "'b"a$an b!"asa!$an 0a!a +n#'$atann%a a"a bb!a+a

&a0a&2 %a$n'5

a. Baut batuan "n#an 0a!a +n#'$atan &$an's

b. Baut batuan "n#an 0a!a +n#'$atan %an# &n##una$an at $'&'a

0. Baut batuan "n#an 0a!a +n#'$atan Gs! ,F!'0t'*n An0/*!" R*0$ B*(t-

". Baut $ab( batuan.

K(an4utan ana('s's (*n#s*!an ba4' "n#an +!*#!a& UNWEDGE a"a(a/

+nan#anan (*n#*s*!an t!sbut. Da(a& +!*#!a& 'n' "a+at "' s'&u(as'$an

+&asan#an baut batuan %an# "'+!(u$an a#a! (*ns*!an t'"a$ t!4a"'. Jn's baut

batuan2 4u&(a/ "an +an4an# 4u#a "a+at "'$ta/u'. S'&u(as' +&asan#an baut

batuan +a"a $(*n#s*!an ba4' "a+at "'('/at +a"a #a&ba! 8.66.

Ga&ba! 8.66

P&asan#an baut batuan +a"a $(*n#s*!an ba4'

B. DATA PENDUKUN<

Yan# "'&a$su" "n#an "ata +n"u$un# a"a(a/ "ata"ata %an# "a+at

&n"u$un# "ata"ata "a!' (a+an#an #una &n#ana('sa +!&asa(a/an %an# a"a

untu$ &n0a!' a(t!nat') +n%(sa'an &asa(a/.

Data +n"u$un# "a+at "'a&b'( anta!a (a'n "a!' "ata /as'( +n#a&atan "'

(a+an#an2 (a+*!an +n('t'an t!"a/u(u "a!' +!usa/aan2 b!*su!b!*su! "a!'

+!usa/aan2 "ata "a!' 'nstans' %an# t!$a't "an "a!' ('t!atu!('t!atu!.

C. ANALISA PEN8ELESAIAN MASALAH

P!&asa(a/an %an# a"a "' (a+an#an s(an4utn%a "'+(a4a!' "an "'$a4'

b!"asa!$an "ata %an# a"a2 ba'$ "ata %an# "'$u&+u($an "a!' /as'( +n%('"'$an

&au+un "ata +nun4an# "an "'"u$un# b!ba#a' t*!' %an# &nun4an#

+!&asa(a/an t!sbut2 s(an4utn%a "'0a!'$an a(t!nat') +n%(sa'annn%a.

A"a+un !'n0'an "a!' ana('sa +n%(sa'an &asa(a/ "a(a& &(a$u$an ana('s's

t!/a"a+ b'"an# $t'"a$&n!usan "an $(*n#s*!an ba4' a"a(a/ sba#a' b!'$ut 5

1. Tahap Persiapan

Pa"a ta/a+ 'n' a$an "'+(a4a!' tntan# )un#s'1tu4uan "a!' "'buatn%a (uban#

bu$aan t!sbut2 u$u!an %an# "''n#'n$an2 "an ba#a'&ana bntu$ (uban#

bu$aan %an# a$an "'buat s!ta a$t''tas +n##a('an (a'n %an# b!"$atan

"n#an (uban# bu$aan %an# a$an "'buat.

2. Tahap Penyelidikan Pendahuluan

Ta/a+ +n%('"'$an +n"a/u(uan "'&a$su"$an untu$ &n"a+at$an "s$!'+s'

u&u& "a!a/ %an# a$an "'s('"'$'2 &('+ut' +n#a&b'(an 0*nt* batuan "n#an

+&b*!an2 +n"u#aan #*)'s'$a ,b'(a &un#$'n-2 +n#u$u!an t$anan a'!2

+n#u$u!an +!&ab'('tas "a!' &assa batuan2 "an +n%('"'$an t!/a"a+

$a"aan #*(*#' s$'ta!.

3. Tahap Penyelidikan Terinci

a. Pnntuan +n#$(as')'$as'an &assa batuan

Pa!a&t! %an# "'+!(u$an untu$ +n#$(as')'$as'san &assa batuan a"a(a/

b*b*t 's'2&*"u(us (ast'$2 $*)'s'n P*'ss*n2 $uat t$an un'a$s'a(2 $uat #s!2

$*/s'2 su"ut #s! "a(a&2 t#an#an 'n s'tu "an bb!a+a +a!a&t! (a'n2

s+!t' $"u"u$an u&u& a!a/ b'"an# $$a!2 "ata s+as' b'"an# $$a!2 $*n"'s'

a'! tana/ +a"a $"a(a&an t!tntu "an RD untu$ t'a+ $"a(a&an. K&u"'an

"ata"ata t!sbut "' 'n+ut $"a(a& +!*#!a& CLASSE7.

b. Ana('s's t!/a"a+ b'"an# $t'"a$&n!usan

M(a$u$an +n%('"'$an "an +n#u$u!an t!/a"a+ b'"an#b'"an#

$t'"a$&n!usan %an# a"a "a(a& suatu s0t'*n (uban# bu$aan2 b'"an#

b'"an# %an# "'u$u! t!uta&a a"a(a/ st!u$tu! $$a!. St(a/ s&ua "ata $$a!

"'"a+at $&u"'an "' 'n+ut $"a(a& +!*#!a& DIPS "an ROCKWORK 9::

untu$ &n#ta/u' a!a/ u&u& "a!' $$a! t!sbut.

0. Ana('s's t!/a"a+ $(*n#s*!an ba4' "an 0a!a +nan#anann%a

St(a/ "ata a!a/ u&u& "a!' b'"an# $t'"a$&n!usan "'"a+at "a!' +!*#!a&

DIPS2 $&u"'an "' 'n+ut $"a(a& +!*#!a& UNWEDGE untu$ &n#ta/u'

$&un#$'nan (*n#s*!an ba4' %an# t!4a"' s!ta &n#ana('sa $&un#$'nan

t!sbut. Yan# t!a/$'! %a'tu &nntu$an 4n's baut batuan %an# ssua'

untu$ &n#/'n"a!' $(*n#s*!an ba4' t!sbut.

BAB III

PENELITIAN DI LAPAN<AN

A. METODOLO<I PENELITIAN

D'"a(a& &(a$sana$an +n('t'an +!&asa(a/an 'n'2 +nu('s &n##abun#$an

anta!a t*!' "n#an "ata"ata (a+an#an2s/'n##a "a!' $"uan%a "'"a+at

+n"$atan +n%(sa'an &asa(a/. A"a+un u!utan +$!4aan +n('t'an %a'tu 5

6. Stu"% ('t!atu!2 b!*su!b!*su!2 (a+*!an +n('t'an t!"a/u(u "a!' +!usa/aan.

8. Pn#a&atan (an#sun# "' (a+an#an2 "'(a$u$an "n#an 0a!a +n'n4auan

(a+an#an untu$ &(a$u$an +n#a&atan (an#sun# t!/a"a+ s&ua $#'atan

"' "a!a/ %an# a$an "'t('t'

;. Pn#a&b'(an Data2 "n#an +n#u$u!an (an#sun# "' (a+an#an &au+un

+n('t'an "' (ab*!at*!'u&.

=. A$u's's' Data

a. Pn#(*&+*$an "ata

b. Ju&(a/ "ata

0. U4' !a('tas

. Pn#*(a/an "ata

. Ana('s's /as'( Pn#*(a/an "ata

. Ks'&+u(an

B. JAD&AL KE<IATAN PENELITIAN

Rencana Kegiatan

Minggu I II III IV V VI VII VIII

Studi Literatur

Penyelidikan Geologi lokal

Pengumpulan data untukpengklasifikasian massa

batuanPengukuran data bidang

ketidakmenerusan

Analisis bidangketidakmenerusan terhadap

kelongoran baji

Penyusunan LaporanPenelitian

C. RENCANA DA'TAR PUSTAKA

6. B'0$(2 J*/n.2 Kus(2 T.2 K'n#2 E.H.2 >Tunn( En#'n!'n# Han"b**$@2

C/a+&an Ha((2D+. BC.2 8n" "'t'*n2 N3 Y*!$2 6::.

8. H*$2 E2 Ka's!2 P.K2 Ba3"n2 W.F.2 >Su++*!t *) Un"!#!*un" E0aat'*ns

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RENCANA DA'TAR ISI

KATA PENGANTAR

RINGKASAN

DAFTAR ISI

DAFTAR GAMBAR

DAFTAR TABEL

DAFTAR LAMPIRAN

I. PENDAHULUAN

II. TINJAUAN UMUM DAERAH PENELITIAN

A. LOKASI DAN KESAMPAIAN DAERAH

B. KEADAAN GEOLOGI

C. IKLIM

D. TINJAUAN SINGKAT PT. FREEPORT INDONESIA COMPANY

E. DEEP ORE ZONE ,D.O.Z-

III. PENGKLASIFIKASIAN MASSA BATUAN

A. MASSA BATUAN

B. PRINSIP KLASIFIKASI MASSA BATUAN

I. ANALISIS BIDANG KETIDAKMENERUSAN

A. METODE ANALISIS

B. ARAH UMUM DARI BIDANG KETIDAKMENERUSAN

. ANALISIS KELONGSORAN BAJI

A. PARAMETER KELONGSORAN BAJI

B. PENCEGAHAN KELONGSORAN BAJI

I. PEMBAHASAN

A. DAERAHDAERAH RAWAN TERJADI KELONGSORAN BAJI

B. PENGGUNAAN ROCK BOLT

II. KESIMPULAN DAN SARAN

DAFTAR PUSTAKA

LAMPIRAN

ANALISIS BIDAN< KETIDAKMENERUSAN UNTUK

MEN<ANTISIPASI TERJADIN8A KELON<SORAN BAJI PADA

LUBAN< BUKAAN TAMBAN< BA&AH TANAH DI D.O.@

PT. 'REEPORT INDONESIA COMPAN8

PROPOSAL TU<AS AKHIR

Dibuat untuk memenuhi persyaratan dalam pelaksanaankerja praktek lapangan

8UDHA EKO MUR&ANTO

73-/-;TA

JURUSAN TEKNIK PERTAMBAN<AN

'AKULTAS TEKNOLO<I MINERAL

UNIERSITAS PEMBAN<UNAN NASIONAL ETERAN

8O<8AKARTA

ANALISIS BIDAN< KETIDAKMENERUSAN UNTUK

MEN<ANTISIPASI TERJADIN8A KELON<SORAN BAJI PADA

LUBAN< BUKAAN TAMBAN< BA&AH TANAH DI D.O.@

PT. 'REEPORT INDONESIA COMPAN8

PROPOSAL TU<AS AKHIR

8UDHA EKO MUR&ANTO

73-/-;TA

D'stu4u' *(/ 5

D*sn 3a(' P&b'&b'n# I

,I!. In"a/ St%*3at'2 MT- , -

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