KEGIATAN KEGIATAN PEMBORAN DALAM PEMBUATAN PEMBUATAN LUBANG LEDAK PADA PADA TAMBANG TAMBANG ANDESIT PT. ANSAR TERANG CRUSHINDO SUMATERA BARAT
Laporan Kerja Praktek
Diajukan untuk memenuhi syarat kurikulum pada Jurusan Teknik Pertambangan Fakultas Teknologi Teknologi Mineral Institut Teknologi Medan
Disusun Oleh :
HERBA SIHOMBING 12 !" !#$
%URUSAN TEKNIK PERTAMBANGAN &AKULT &AKULTAS AS TEKNOLOGI TEKNOL OGI MINERAL INSTITUT TEKNOLOGI MEDAN
2!1"
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KEGIATAN KEGIATAN PEMBORAN DALAM PEMBUATAN PEMBUATAN LUBANG LEDAK PADA TAMBANG TAMBANG ANDESIT PT. ANSAR TERANG CRUSHINDO SUMATERA BARAT Laporan Kerja Praktek
LEM!" PE#$E%!&!#
Diajukan untuk memenuhi syarat kurikulum pada Jurusan Teknik Pertambangan Fakultas Teknologi Teknologi Mineral Institut Teknologi Medan
Diketahui oleh :
Disetujui oleh :
'etua Jurusan Teknik Teknik Pertambangan(
Dosen Pembimbing
) Ir. M. Eka On'ar(ana) MT *
* Ir.S+a,r-a(-)MT
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2!1" KATA KATA PENGANTAR PENG ANTAR
Puji dan syukur penulis panjatkan panjatkan kehadirat Tuhan +ang Maha 'uasa karena atas rahmat dan karunia,#ya penulis dapat menyelesaikan penulisan Laporan 'erja Praktek ini- 'erja praktek ini kami laksanakan pada perusahaan yang bergerak di bidang 'egiatan Penambangan atuan !ndesit- Dalam penulisan Laporan 'erja Praktek ini( penulis banyak mendapat bantuan dari berbagai pihak- .ntuk itu pada kesempatan ini penulis mengu/apkan terima kasih yang sebesar,besarnya kepada : 0- Orang Orang Tua Tua penulis penulis yang telah memban membantu tu penulis penulis baik berupa berupa moril moril maupun maupun materil1- apa apak k IrIr- %ya2r %ya2ria iadi( di( MT seba sebaga gaii Deka Dekan n dan dan Dosen Dosen pembim pembimbi bing ng saya saya di Fakultas Teknologi Teknologi Mineral Institut Teknologi Teknologi Medan )ITM*3- apak Ir-M-E Ir-M-Eka ka On4ardana( On4ardana( MT sebagai sebagai 'etua Jurusan Jurusan Tek Teknik nik Pertambang Pertambangan an Institut Teknologi Teknologi Medan )ITM*5- Edi +as +asaa !rdiansya !rdiansyah(%T h(%T(M (MT T sebagai Dosen Dosen koordinator koordinator 'erja Praktek 6- 'aka 'akak k seni senior or yang yang telah telah memb memban antu tu serta serta member memberik ikan an masu masuka kan, n,ma masu suka kan n yang berguna bagi penulis7- Teman,t man,tem eman an angk angkat atan an 801 801 Di Juru Jurusa san n Tekni eknik k Perta Pertamb mban anga gan n Inst Instit itut ut Teknologi Teknologi Medan )ITM*9- %eluru %eluruh h rekan,r rekan,reka ekan n yang yang telah ikut ikut memban membantutuPenulis Penulis menyadari menyadari masih banyak banyak kekurangan kekurangan dalam Penulisan Penulisan Laporan Laporan 'erja Prak Praktek tek ini( ini( untu untuk k itu itu sang sangat at diha diharap rapkan kan kriti kritika kan n dan dan saran saran yang yang bers bersi2a i2att membangun dari semua pemba/a yang bertujuan untuk penyempurnaan Penulisan Laporan 'erja Praktek ini-
Medan(
Maret 1807
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DA&TAR ISI
&alaman KATA KATA PENGANTAR....... PENGANTAR.............................. .............................................. ................................................... ..................................DA&TAR DA&TAR ISI...................................... ISI............................................................. .......................................................... ................................... ..-DA&TAR DA&TAR GAMBAR................................... GAMBAR.................................................................................... ................................................. .-/ DA&TAR DA&TAR TABEL.................. TABEL......................................... ..................................................................... ................................................./ .../ DA&TAR DA&TAR ALAMPIRAN................. ALAMPIRAN........................................ .............................................. ....................................... ................ /I PENDAHULUAN......................................................................................I0I 0-0 Latar elakang------------------------------------------elakang------------------------------------------------------------------------------------------------------------------------ ------I,0 0-1 Maksud dan Tujuan---------------------Tujuan------------------------------------------------------------------------------------------------------------------------------------------ I,1 0-3 "uang Lingkup 'egiatan-----------------------------------------'egiatan-----------------------------------------------------------------------------------------------I,1 --------I,1 0-5 Metode Penulisan------------------------------------Penulisan--------------------------------------------------------------------------------------------------------------------------------I,3 I,3 0-5 Diagram !lir-----------------------------------!lir----------------------------------------------------------------------------------------------------------------------------------------I,5 ----------I,5 II TIN%AUAN UMUM............ UMUM................................... .............................................. .............................................. .......................II01 II01 1-0 Lokasi------------------------------------------------------------------------------------------------------II,0 1-1 Topogra2i-------------------------------------------------------------------------------------------------II,1 1-3 Iklim dan ua/a----------------------------------------ua/a-------------------------------------------------------------------------------------------------------------II,3 -----------------------II,3 1-5 $eologi----------------------------------------------------------------------------------------------------II,6 1-6 %tratigra2i-------------------------------------------------------------------------------------------------II,7 1-6-0 !lu;ium %ungai--------------------------------------%ungai------------------------------------------------------------------------------------------------------II, ------------------II,7 7 1-6-1 atuapung dan !ndesit--------------------------------!ndesit-------------------------------------------------------------------------------------------II,7 -------------II,7 1-6-3 !ndesit
!ndesit asal------------------------------------------asal---------------------------------------------------------------------------------------------------------------------------II,= II,= 1-6-08 atuan Malihan 'arbon--------------------------------------'arbon---------------------------------------------------------------------------------------------II,= II,= 1-6-00 atuan 'arbonat 'arbon-------------------------------------'arbon------------------------------------------------------------------II,= ----------------------------II,= 1-6-01 !nggota 'uarsit perm 'arbon----------------------------------------------'arbon----------------------------------------------- --------II,= -------- II,= 1-7 Jam 'erja---------------------------------------------'erja-----------------------------------------------------------------------------------------------------------------------II,> ----------------------------II,> 1-9 adangan atu !ndesit-------------------------------!ndesit--------------------------------------------------------------------------------------------------------------------- II,> 1-= Proses Pelaksanaan 'egiatan dan Penga4asan------------------Penga4asan---------------------------------------II,> --------------------II,> 1-=-0 Pembuatan Jalan---------------------------------------------Jalan--------------------------------------------------------------------------------II,> ----------------------------------II,> 1-=-1 Pembersihan Lahan )Land learing*-------------------------------------------------II,08 learing*-------------------------------------------------II,08 1-=-3 Pengupasan Tanah Tanah Pu/uk----------------------------------Pu/uk-------------------------------------------------------------------------------------- -----II,08 1-=-5 Pengupasan Ta II,00
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1-=-= Pengangkutan )&auling* ke %to/kpile-----------------------------------------------II,03 %to/kpile-----------------------------------------------II,03 1-=-> Peremukan )rushing*--------------------------------------)rushing*---------------------------------------------------------------------------------------------II,05 ---------II,05 III LANDASAN TEORI.................................... TEORI.............................................................................. .......................................... III01 3-0 Pemboran------------------------------------------------------------------------------------------------III,1 3-1 Faktor Faktor +ang Mempengaruhi 'egiatan Pemboran-----------------------III,1 3-1-0 %i2at atuan----------------------------------------atuan--------------------------------------------------------------------------------------------------------------------------------III,1 ---III,1 3-3 $eometri Pemboran-------------------------------------Pemboran-------------------------------------------------------------------------------------------------------III,6 --------------------III,6 3-3-0 Diameter Lubang Tembak--------------Tembak--------------------------------------------------------------------------------------------------------- ---III,6 3-3-1 'edalaman Lubang Tembak-------------Tembak-----------------------------------------------------------------------------------III,7 ------------------------III,7 3-3-3 'emiringan Lubang Tembak------------Tembak----------------------------------------------------------------------------------III ------------------------III ,7 3-3-5 Pola Pemboran----------------------------------Pemboran--------------------------------------------------------------------------------------------------------III,= ------------------------III,= 3-5 $eometri Peledakan----------------------Peledakan------------------------------------------------------------------------------------------------------------------------------------ III,03 3-5-0 urden--------------------------------------urden----------------------------------------------------------------------------------------------------------------------------------------------- --III,05 3-5-1 %pasi-----------------------------------------%pasi---------------------------------------------------------------------------------------------------------------------------------------- -------III,06 ------- III,06 3-5-3 %temming----------------------------------%temming--------------------------------------------------------------------------------------------------------------------------------------III,06 ---------III,06 3-5-5 %ubdrilling----------------------------------%ubdrilling--------------------------------------------------------------------------------------------------------------III ------------------------------III ,09 3-5-6 'edalaman Lubang Ledak----------------------------------------Ledak----------------------------------------------------------------III,09 -----------------------III,09 3-5-7 Tinggi Tinggi Jenjang-----------------------------------------Jenjang--------------------------------------------------------------------------------------------------------------------- --III,0= 3-5-9 Panjang 'olom Isian----------------------------------------------Isian----------------------------------------------------------------------------------------III --------III,0> ,0> 3-6 .mur Dan 'ondisi Mesin or---------------------------------------------------------------or---------------------------------------------------------------- III,18 3-7 'eterampilan Operator----------------------Operator--------------------------------------------------------------------------------------------------III ------------------------------III ,18 3-9 'inerja Mesin or---------------------------------------or-------------------------------------------------------------------------------------------------------------------------- III,18 3-= &ambatan yang dialami pada saat Pemboran-----------------------------------------III,10 Pemboran-----------------------------------------III,10 3-> Estimasi Produksi Mesin or------------------------------------------or-------------------------------------------------------------------------------------- III,10 I PEMBAHASAN.............................. PEMBAHASAN..................................................... ........................................................ ................................. I01 I01 5-0 Pemboran Lubang Ledak---------------------------------------Ledak---------------------------------------------------------------------------------------------I?, --------I?,0 0 5-0-0 Peralatan Pemboran------------------------------------Pemboran------------------------------------------------------------------------------------------------------------- I?,0 I?,0 5-0-1 Persiapan %ebelum Peledakan----------------------------------------------------------I?,3 Peledakan----------------------------------------------------------I?,3 5-0-3 Tahapan Tahapan Pemboran-----------------------------------Pemboran------------------------------------------------------------------------------------------------------- -----I?,5 5-0-5 !rah Pemboran-----------------------------------Pemboran---------------------------------------------------------------------------------------------------------------------------- I?,5 I?,5 5-0-6 Pola Pemboran----------------------------------Pemboran--------------------------------------------------------------------------------------------------------I? ------------------------I?,5 ,5 5-1 Produkti;itas Mesin or----------------------------------------or-----------------------------------------------------------------------------------------------I?,6 ---------I?,6 5-1-0 @a @aktu ktu Edar Pemboran----------------------------------Pemboran----------------------------------------------------------------------I?,6 -----------------------------------I?,6 5-1-1 'e/epatan Pemboran----------------------------------Pemboran----------------------------------------------------------------------------------------------------------- I?,9 I?,9 5-1-3 E2isiensi 'erja Pemboran-----------------------------------Pemboran-----------------------------------------------------------------I?,9 -----------------------------I?,9 5-1-5 ?olume %etara-----------------------------------------------%etara---------------------------------------------------------------------------------------------------------I?,0 ------------I?,08 8 5-1-6 Produksi Pemboran---------------------------------------Pemboran-------------------------------------------------------------------------------------------------I? ------------I?,0 ,00 0 KESIMPULAN DAN SARAN........................................... SARAN.................................................................I ......................I0# 0# 6-0 'esimpulan---------------------------------------------------------------------------------------------?,0 6-1 %aran-------------------------------------------------------------------------------------------------------?,1 DA&TAR PUSTAKA
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D!FT!" $!M!"
&alaman An3ar Teran6 Teran6 Cr735-n(o.. . .II02 $ambar 1-0 Peta Ke3a4pa-an Daera5 PT. An3ar $ambar 1-1 Peta Topo6ra,- PT. An3ar Teran6 Cr735-n(o.......................II0 $ambar 1-3 urah &ujan Perbulan Pada Tahun Tahun 1803----------------------------------II,5 1803----------------------------------II,5 $ambar 1-5 Jumlah &ari &ujan Perbulan-------------------------------------Perbulan----------------------------------------------------------------- II,6 $ambar 1-6 !kses Jalan Tambang----------Tambang------------------------------------------------------------------------------------------------------------II,08 -------II,08 $ambar 1-7 Proses Digging............ Proses Digging................................... .............................................. ....................................... ................ II,00 $ambar 1-9 Proses Dozing Proses Dozing ---------------------------------------------------------------------------II,01 ---------------------------------------------------------------------------II,01 $ambar 1-= Disposal Area Area---------------------------------------------------------------------------II,01 $ambar 1-> Proses Pemuatan-----------------------------------------Pemuatan-----------------------------------------------------------------------II,03 -----------------------------II,03 $ambar 1-08 1-08 Proses Pengangkutan------------------Pengangkutan----------------------------------------------------------------------------------------------------------- II,05 $ambar 1-00 Hopper --------------------------------------------------------------------------------------II,05 --------------------------------------------------------------------------------------II,05 $ambar 1-01 Belt Conveyor ---------------------------------------------------------------------------II,06 ---------------------------------------------------------------------------II,06 $ambar 1-03 Vibrating Screen-----------------------------------------------------------------------II,06 Screen-----------------------------------------------------------------------II,06 $ambar 1-05 Panel Listrik-------------------------------------------Listrik----------------------------------------------------------------------------------------------------II,07 -----------II,07 $ambar 3-0 'egiatan pemboran--------------------------------------pemboran-------------------------------------------------------------------III,1 ----------------------------III,1 $ambar 3-1 !rah Pemboran-------------------------------------Pemboran----------------------------------------------------------------------------------------------------------- III,9 $ambar 3-3 Pola ujursangkar )Square Pattern*-----------------------------------------III,= Pattern*-----------------------------------------III,= $ambar 3-5 Pola Persegi Panjang (Rectangular Pattern*----------------------------III,> Pattern*----------------------------III,> $ambar 3-6 Pola AigBag ujur %angkar--------------------------------------%angkar-------------------------------------------------------III,> ----------------III,> $ambar 3-7 Pola AigBag Persegi Panjang---------------------------------------------------Panjang---------------------------------------------------- III,08 $ambar 3-9 Pengaruh Energi Ledakan Pada Pola Pemboran-----------------------III,08 Pemboran-----------------------III,08 $ambar 3-= 'etidakteraturan Tata Tata Letak----------------------------------------Letak----------------------------------------------------------------III,00 III,00 $ambar 3-> Penyimpangan !rah Dan %udut Pemboran----------------------Pemboran------------------------------III -------III,01 ,01 $ambar 3-08 'edalaman Dan 'ebersihan Lubang or---------------------------------III,03 or---------------------------------III,03 $ambar 3-00 $eometri Peledakan--------------------------------------Peledakan------------------------------------------------------------------III,03 ---------------------------III,03 $ambar 3-01 Pengaruh urden agi &asil Peledakan-----------------------------------III,05 Peledakan-----------------------------------III,05 $ambar 3-03 Stemming ----------------------------------------------------------------------------------III,07 ----------------------------------------------------------------------------------III,07 $ambar 3-05 'edalaman Lubang Ledak-----------------------Ledak------------------------------------------------------------------------------III,0= ---------III,0= $ambar 3-06 Panjang 'olom Isian )P*--------------------------------------)P*--------------------------------------------------------III,18 -----------------III,18 $ambar 5-0 Furuka4a "o/k Drill P" 188-------------------------------------188-------------------------------------------------I?, -----------I?,0 0 $ambar 5-1 'ompresor .ntuk 'egiatan Pemboran------------------------------ ------I?, ------ I?,1 1 $ambar 5-3 Mata or .ntuk 'egiatan Pemboran----------------------------Pemboran------------------------------------------------I?, I?,1 1 $ambar 5-5 Menandai Titik Lokasi Pemboran------------------------------------------- -I?,3 $ambar 5-6 Operator Melakukan 'egiatan Pemboran-------------------------------- I?,5 I?,5 $ambar 5-7 5-7 Pemboran Dengan !rah Lubang Ledak Tegak-------------------------I?, Tegak-------------------------I?,6 6 $ambar 5-9 $eometri Pemboran Tegak Tegak Dengan Pola AigBag ujursangkar -------------------------------------------------------------------------------------------------I?,6
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DA&TAR TABEL
&alaman Tabel Tabel 1-0 Titik 'oordinat 'oordinat IBin .saha Pertambangan )I.P* PT- !nsar Terang Terang rushindo-------------------------------rushindo----------------------------------------------------------------------------------------------------------------- --II,0 Tabel Tabel 1-1 urah &ujan Dan &ari &ujan 'abupaten Lima Puluh 'ota-------- --II,5 Tabel Tabel 3-0 'ekerasan dan 'ekuatan atuan-------------------------atuan----------------------------------------------------III,3 --------------------------III,3 Tabel Tabel 3-1 eberapa %i2at Dan Dan Mekanik Dari atuan %edimen----------------------III %edimen---------------- ------III,5 ,5 Tabel Tabel 3-3 'andungan 'uarsa Dari atuan---------------------------------atuan----------------------------------------------------------------------- III,5 Tabel Tabel 3-5 Potensi +ang +ang Terjadi Terjadi !kibat !kibat ?ariasi ?ariasi %ti22nes "atio )L<*----------)L<*------ ----------III,0> III,0> Tabel Tabel 5-0 @a @aktu ktu Edar Tiap Lubang or--------------------------------------------------------or--------------------------------------------------------- I?,7 I?,7 Tabel Tabel 5-1 Tabel Tabel Jad4al @aktu 'erja-------------------------------------------------------------'erja-------------------------------------------------------------- I?,= I?,= Tabel Tabel 5-3 Pengurangan @aktu @aktu 'erja Produkti2---------------------------------------------Produkti2---------------------------------------------- I?,> I?,>
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DA&TAR LAMPIRAN
&alaman Lampiran 0Lampiran 1Lampiran 3Lampiran 5-
%truktur Organisasi PTPT- !nsar Terang Terang rushindo---------------------rushindo---------------------- L,0 %2esi2ikasi Teknis Teknis Fruka4a "o/k Drill P" 188------------------188-------------- --------L,1 ---L,1 %2esi2ikasi Teknis Teknis ompresor !irman !irman PD% 968%----------------------L,6 968%----------------------L,6 Proses 'egiatan Pemboran Pada PT-!nsar PT-!nsar Terang Terang rushindorushindo- -L,7
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1. PENDAHULUAN
1.1 Latar Be8akan6
Indonesia di kenal dengan dengan negara yang memiliki kekayaan alam yang berlimpah diantaranya adalah batuan andesit yang merupakan salah satu sektor andalan sumber pendapatan negara yang selanjutnya sel anjutnya diman2aatkan untuk meningkatkan kesejahteraan rakyat- Dalam proses penambangan batuan andesit perlu dilakukan pembongkaran terlebih dahulu agar dapat memindahkan memindahkan material o;erburden dari 2ront kerja ke Disposal ke Disposal dan dan batubara dari 2ront kerja ke stoc ke stoc R!" !dapun kondisi batuan yang akan digali atau diman2aatkan berma/a,ma/am karakteristik( tekstur( struktur dan kekerasannya( maka dalam usaha,usaha tersebut perlu diterapkan suatu metode yang tepat- Misalnya terhadap batuan yang keras )andesit*( maka proses peman2aatannya dapat dilakukan dengan metode peledakan- Tetapi Tetapi sebelum pelaksanaan keputusan pekerjaan peledakan( perlu dipertimbangkan terlebih dahulu adanya 2akto,2aktor pemilihan bahan peledak dan 2a/tor,2aktor teknis yang mempengaruhi hasil dari suatu proses tersebut( sehingga ketetapan pekerjaan dapat ter/apaia- Ilmiah erdasarkan komposisi mineral andesit mempunyai si2at massi;e dan keras sehinggga untuk produksi perlu dilakukan penanganan dengan pemberaian massa
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Metode pemboran yang utama dipergunakan dalam tambang terbuka atau quarry adalah pemboran ;ertikal atau miring- Dalam pekerjaan tambang pemboran ini dilakukan untuk media bahan peledak- %ehingga dapat di2ungsikan sebagaimana mestinya dan juga pemboran ini sangat berpengaruh terhadap bentuk permukaan tambang khususnya bentuk benc# yang diledakkan b-!kademis %e/ara akademis kegiatan ini ditujukan untuk memenuhi kriteria ketentuan kuriklum yaitu untuk melaksanakan kerja praktek atau magang sebagai dasar untuk pelatiahan kerja-Dengan demikian dalam kegiatan proses penambangan batuan andesit mulai dari pemboran(peledakan(pemuatan(pengangkuatan pemboran(peledakan(pemuatan(pengangkuatan dan pemberaian dapat dilihat
1.2 Mak37( (an T7 T7j7an j7an
Maksud dari pelaksanaan kerja praktek ini adalah sebagai berikut : a- Menem Menempu puh h mata mata kuli kuliah ah 'erja 'erja Prak Praktek tek menu menuru rutt kete ketent ntua uan n kurik kurikul ulum um pada pada Jurusan Teknik Teknik Pertambangan9. Memberikan pengalaman dan pengetahuan kepada kami mengenai kegiatan
Pemboran dan E;aluasi 'inerja Mesin or dalam pembuatan lubang Ledak pada pertambangan !ndesit !ndesit PT-!nsar PT-!nsar Terang Terang rushindo !dapun Tujuan Tujuan yang dapat diperoleh dari pelaksanaan kerja praktek ini adalah sebagai berikut : a- Dapat menerap menerapkan kan dan dan menselarask menselaraskan an teori,teori teori,teori yang telah didapat didapat di bangku bangku kuliah dengan kerja kerja praktek yang dilakukan di perusahaan pertambangan-
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bor saat melakukan pengeboran dan proses kinerja mesin bor dalam dalam membuat lubang ledak serta upaya upa ya yang dilakukan untuk mendapatkan hasil pemboran dan peledakan yang e2isien-
1. Meto(e Pen78-3an
Metode yang digunakan dalam penyusunan Laporan 'erja Praktek ini adalah sebagai berikut : 0-
Pengambilan data a- Data Data Prim Primer er(( yaitu yaitu data data yang yang diku dikump mpul ulka kan n deng dengan an melak melakuk ukan an peng pengam amata atan n lang langsu sung ng dila dilapa pang ngan an(( melip meliput utii data data Cyle $ime $ime alat alat bor dan pengam pengamatan atan peralatan yang digunakan b Data %ekunder( yaitu data yang dikumpulkan dikumpulkan berdasarkan literatur dan re2erensi dari perusahaan1- Pengolahan data Data yang yang telah diperoleh kemudian dipilih sesuai dengan bahasan yang kami amati- 'emudian kami melakukan pengolahan data dan disajikan dalam bentuk laporan-
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1.: D-a6ra4 A8-r
Mulai
%tudi Literatur
Pengumpulan Data Lapangan
%2esi2ikasi !lat or
@aktu Edar Pemboran
Jenis ahan Peledak
Pola Pemboran
Data %i2at 2isik atuan
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II. TIN%AUAN UMUM
2.1 Loka3-
%e/ara geologis lokasi pertambangan PT- !nsar !nsar Terang rushindo berada di Jorong Pauh !nok #agari Pangkalan 'e/amatan Pangkalan 'oto aru 'abupaten Lima Puluh 'ota( Pro;insi %umatera aratar at- Titik koordinat IBin .saha Pertambangan )I.P* dapat dilihat pada table diba4ah ini: Tabel Tabel 1-0- Titik 'oordinat IBin .saha Pertambangan )I.P* PT- !nsar !nsar Terang rushindo #
ujur Timur
Lintang %elatan
'eterangan
O 0
C
C
088
55
09-7
88
5
30-1
1
088
55
13-=
88
5
30-1
Total Luas
3
088
55
13-=
88
5
=->
!rea
5
088
55
0-6
88
5
>-1
18 &a
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Ga49ar 2.1 Peta Ke3a4pa-an Daera5 PT. An3ar Teran6 Cr735-n(o
atas lokasi kegiatan penambangan adalah : 0* %ebelah .tara berbatasan berbatasan dengan perkebunan masyarakat masyarakat 1* %ebelah %elatan berbatasan dengan perkebunan masyarakat masyarakat 3* %ebelah arat berbatasan dengan perkebunan masyarakat masyarakat 5* %ebelah Timur Timur berbatasan dengan jalan raya lintas %umbar "iau
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Ga49ar 2.2 ; Peta Topo6ra,- PT. An3ar Teran6 Cr735-n(o 2. Ik8-4 (an C7a
Iklim dan /ua/a merupakan salah satu 2aktor yang sangat berpengaruh dalam kegiatan penambangan( karena seluruh akti;itas kerja pada tambang terbuka berhubungan langsung dengan dengan udara bebas- &al ini akan mempengaruhi
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ulan
Januari Pebruari Maret !pril Mei Juni Juli !gustus %eptembe r Oktober #opember Desember Jummlah
urah &ujan )mm* Tahun 1803 3> 181 103 0603 >1 76 000 96 189 73> 175 33> 396>
&ari &ujan )hari* Tahun 1803 9 09 07 0> 9 6 = 3 10 0> 16 06 071
Sumber % Ba&an Pusat Statisti (BPS' ab.)ima Pulu# ota Daerah %umatera arat termasuk daerah yang beriklim tropis( di 4ilayah tambang /urah hujan bulanan maksimum 0-603 mm pada bulan !pril tahun 1803 dan /urah hujan bulanan minimum men/apai 3> mm pada bulan januari tahun 1803- )lihat $ambar 1-3 dan $ambar 1-5*
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%truktur geologi yang berpengaruh pada kegiatan peledakan adalah struktur rekahan )kekar* dan struktur pelapisan batuan- 'ekar (*oin' merupakan (*oin' merupakan rekahan, rekahan dalam batuan yang terjadi kerena tekanan atau tarikan yang disebabkan oleh gaya,gaya yang bekerja dalam kerak bumi-Dengan adanya struktur rekahan ini maka energi gelombang tekanan dari bahan peledak akan mengalami penurunan yang disebabkan oleh oleh adanya gas,gas hasil reaksi peledakan yang menerobos melalui rekahan( sehingga mengakibatkan penurunan da ya tekan terhadap batuan yang akan diledakkan- Penurunan daya tekan ini akan berdampak terhadap batuan hasil peledakan bahkan batuan hanya mengalami retakan-
2.: Stat-6ra,-
%usunan stratigra2i daerah dari batuan yang tua ke batuan yang lebih muda dapat
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berbentuk keru/ut dan kurang mengalami mengalami pengikisan( biasanya ber4arna kelabu gelap( dengan tekstur halus,kasar-
2.:. An(e3-t=Por,-r Da3-t
!ndesit
2.:. Da3-t G7n7n6 Ma8-ntan6
Dasit gunung malintang malintang berumur Pliosen yang Pliosen yang terbentuk suatu kala dalam skala 4aktu geologi yang berlangsung 6(331 hingga 0(=87 juta tahun yang
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2.:.# &or4a3- Bran-
4ormasi ini berumur !ligosen yang !ligosen yang terbentuk dalam suatu kala pada skala 4aktu geologi yang berlangsung dari sekitar 35 hingga 13 juta tahun yang lalu-Te lalu- Terdiri rdiri dari konglomerat dengan sisipan batupasir( komponen konglomerat terdiri dari 2ragmen,2ragmen kuarsit( kuarsa( rijang dan granit( ber4arna kelabu muda kelabu kehijauan-
2.:.> An(e3-t Ba3a8
An&esit basal berumur 5osen yang 5osen yang terbentuk dalam suatu kala pada skala 4aktu geologi yang berlangsung 66(= G 8(1 hingga 33(> G 8(0 j uta tahun yang lalu-Mendasari beberapa bukit,bukit yang rendah( seperti di ukit Pintuangin( ukit atu- atuannya terdiri dari la;a( breksi( aglomerat dan batuan hipabisal-
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2." %a4 Kerja
'egiatan penambangan PT- !nsar Terang Terang rushindo dilakukan dengan satu shi2PT- !nsar Terang Terang rushindo adalah sebagai s ebagai berikut: %hi2t 0 : Mulai 8=-88 09-88( istirahat )01-88 03-88* %hi2t 1 : Dilaksanakan apabila target produksi tidak ter/apai sehingga diperlukan penambahan jam kerja pada malam hari untuk men/apai target produksi-
2.$ Ca(an6an Bat7 An(e3-t
PT- !nsar Terang Terang rushindo memulai penambangan batu andesit pada tahun 1808( dengan luas daerah penambangan seluas 18 &a yang berlokasi di Jorong Pauh !nak( #agari Pangkalan( 'e/amatan pangkalan 'oto aru( 'abupaten Lima
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Tanah Tanah pu/uk yang telah terkupas selanjutnya di timbun dan dikumpulkan pada lokasi tertentu yang dikenal dengan istilah $op Soil Ban - .ntuk selanjutnya tanah pu/uk yang terkumpul di di top soil ban akan akan dipergunakan sebagai pelapis teratas pada lahan disposal yang telah berakhir dan memasuki tahapan program program reklamasi2.#. Pen67pa3an Lap-3an Tana5 Pen7t7p (Overburden '
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pengambilan bahan galian adalah dengan metode pemboran pemboran dan peledakan )&rilling3blasting'&rilling3blasting'!dapun urutan kegiatan pemboran dan peledakan adalah: a Meyiapkan lokasi pemboran dan peledakan 9 Menentukan desain pemboran < Melakukan pemboran berdasarkan desain
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o
Parodukti2 )menit*
0
Pem Pemerik eriksa saan an dan dan pem pemanas anasan an alat alat
1
Menunggu M ko kompresor
3
diantar kelokasi 'eperluan Operator
Mengurangi @aktu Produkti2 )menit* 08
588 68 06
Jumlah
588
96 588,96 316
erdasarkan tabel di atas( maka 4aktu kerja e2ekti2 yang digunakan untuk melakukan pemboran adalah 316 menit dan 4aktu e2ekti2 yang tidak digunakan karena hambatan adalah 96 menit- !pabila operator bisa memaksimalkan 4aktu tersebut untuk melakukan pemboran maka bisa menghasilkan: Jumlah lubang bor
Waktu Kerja Efektif Efektif Waktu Edar 75 menit / hari
10,21 menit / lubang = lubang
Σ lubang
bor yang dihasilkan
Σ lubang
yang tidak
dihasilkan 31 lubang = lubang 58 lubang )sesuai dengan perhitungan teori*
.2. o874e Setara
?olume setara seta ra )eui;alent ;olume(?e* ;olume(?e* menyatakan men yatakan ;olume batuan yang diharapkan terbongkar untuk setiap meter kedalaman lubang ledak yang dinyatakan dalam m3
Jumlah lubang lubang ledak ledak 31 lubang lubang Tingg inggii jenj jenjan ang g )&* )&* 1(6 1(6 mete meter r
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Dengan geometri peledakan tersebut di atas( maka ;olume setara dapat dihitung sebagai berikut: ?e
V Nx H
?
! K L K Dr
!
K%K# 01= m1 K 1-6 K 1-65 ¿ 812
?e
¿
812 32 x 2.5 812
80
08-11 m3
.2.: Pro(7k3- Pe49oran
Produksi pemboran adalah suatu nilai yang menyatakan ;olume batuan yang akan dibongkar pada setiap satuan 4aktu- Produksi pemboran sangat tergantung ke/epatan pemboran( ;olume setara dan penggunaan e2ekti2 mesin bor yang dinyatakan dalam m3
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0>16(95 m3
. KESIMPULAN DAN SARAN
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:.1 Ke3-4p78an
erdasarkan pembahasan yang telah dilakukan atas kegiatan pemboran di PT-!nsar PT-!nsar Terang rushindo( maka dapat diambil kesimpulan: 0- !lat,al !lat,alat at yang yang dipak dipakai ai saat saat pembor pemboran an adalah: adalah: R Furuka4a SP/r SP/r 188 R 'omp 'ompre reso sorr merk merk S!i S!irm rman an,P ,PD% D% 968 968 % R Total tal pan panjan jang g bata batang ng bor bor adala adalah h 3 mete meter r R Mata Mata bor yang yang digun digunaka akan n sebagai sebagai penet penetrasi rasi batu batuan an andes andesit it berjen berjenis is button button bit dengan diameter 3 in/hi1- $eomet $eometri ri pemb pembora oran n yang yang diterap diterapkan kan:: R 'edalaman 1(6 meter R Diameter 3 in/hi R 'emiringan tegak R Pola BigBag bujursangkar 1K1 3- Produk Produkti2i ti2itas tas yang yang diha dihasil silkan kan:: R @aktu edar 08 08(10 menit
%etelah dilakukan pengamatan dan perhitungan di lapangan( maka penulis menyarankan:
0 - 'aren 'arenaa kemamp kemampua uan n alat alat mela melaku kuka kan n pemb pembor oran an adala adalah h 58 luba lubang ng
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DA&TAR PUSTAKA
0 - &eri @iratmoko( 1800( S'ajian Teknis Pengaruh Pengeboran Miring Pada Peledakan Lapisan Tanah Tanah Penutup Penutup Terhadap Terhadap Produkti;itas !lat Muat Muat %ho; %ho;el el Lieb Liebhe herr> rr>36 368 8 Di oll ollar ar 1 ,3 PT %apt %aptai aind ndra ra %ejat %ejatii
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1 - 'oesnaryo-%-( 0>==( S"an/angan Peledakan atuan( Jurusan Teknik Perta Pertamb mban anga gan n((
Juru Jurusan san
Teknol knolog ogii
Mine Mineral ral((
.P# .P#
S?e S?eteran teran
+ogyakarta3 - 'oesnaryo-% 'oesnaryo-%-( -( 1880( 1880( SPemboran SPemboran untuk untuk Penyediaan Penyediaan Lubang Ledak( Ledak( Jurusan Teknik Pertambangan .P# S?ETE"!# +ogyakarta5 - ambang ( T( 0>96( Pengantar Teori Teknik Pemboran( Patra( IT( andung6 - Marhaendras4o Marhaendras4oro( ro( 0>>>(S%tat 0>>>(S%tatigra2i igra2i /ekungan /ekungan Ombilin Ombilin Pustlitbang Pustlitbang tek,Mira(andung7 - N-N-N( 1803( 1803( SPadang Dalam !ngka !ngka adan Pusat Pusat %tatistik )P%* )P%* 'abupaten Lima Puluh 'ota9 - "i/hard L-!sh( L-!sh( 0>>8( SDesign o2 o2 lasting "ound( %ur2a/e Mining( Mining( -!- 'ennedy Editor( %o/iety 2or Mining(Metallurgy( and EKplotion( In/- Page- 676,6=5= - &ult- 0>>=( 0>>=( SEstimasi SEstimasi Produksi Produksi Mesin or dan dan ykle ykle Time( Time(#e4 #e4 +ork-
LAMPIRAN 1. STRUKTUR ORGANISASI PT. ANSAR TERANG CRUSHINDO
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Sumber% P$. Ansar $erang Crus#in&o ;<-=
LAMPIRAN 2. S&ESI&IKASI TEKNIS &RUKA@A &RUKA@A ROCK DRILL PCR 2!!
D-4en3-on Panjang 'eseluruhan
6588
mm
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erat )4ithout shank rod* Panjang )4ithout shank rod* Diameter %ilinder Piston %troke Jumlah Tumbukan Jenis Putaran Motor 'e/epatan "otasi Torsi "otasi 'onsumsi .dara Tekanan .dara G7-(e 35e88 Model Length Feed length "od length $uide slide length Feed motor , model Feed motor , type Feed motor , output Feed motor , air /onsumption "od pull Boo4 Model Type oom length oom li2t angle $uide tilt angle )4ithout pin /hange* $uide s4ing angle )4ith pin /hange* oom s4ing angle Po'er p74p
rotation 0=8 0818 038 =8 !pproK-0788 $ear motor 8,3=8 37(6 !pproK-07 6(6
kg mm mm mm bpm r pm kg,m m 3
P"188 6558 3908 3868 0188 M1 piston type( 6 /ylinders 4ith redu/tion gears 6 )at 7 kg
hp M 3
P"188 O;erturn 1888 ,16 , 56 0=8
mm degrees degrees
,06 , >6
degrees
,56 , 56
degrees
mm mm mm mm
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Tra/k length Tra/k 4idth @idth o2 grousers Length o2 ground /onta/t $round /learan/e To4 hit/h height $round /onta/t pressure Tra;elling speed )to4ing a /ompressor on le;elling ground* $radeability )4ithout to4ing a /ompressor* $radeability )4ith to4ing a /ompressor* Os/illating angle Os/illating system Tra/tion motor , model Tra/tion motor , type
16=8 1188 388 0==6 1=8 668 8(56 3-1
mm mm mm mm mm mm 'g
36
degrees
11
degrees
06 hydrauli/ /ylinders M"03 piston type( 6 /ylinders
degrees
LAMPIRAN . S&ESI&IKASI TEKNIS COMPRESOR AIRMAN PDS $:!S
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?olume 2lo4 Engine Po4er MaK-Pressure @eigth
10(1 060 = 3688
m 3
LAMPIRAN . PROSES KEGIATAN KEGIATAN PEMBORAN PADA PT. ANSAR TERANG CRUSHINDO
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Penentuan Titik Lubang or
Penyetelan !lat or %upaya Posisinya %tabil %aat Proses Pemboran
Pemindahan !lat or 'elokasi
Proses Pemboran Lubang Ledak