Download - mpd tugas
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NISBAH KUPAS COG – BECOG - ICOG
DEFINISI – RUMUS - APLIKASI
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CUTOFF GRADE , CUT-OFF GRADE (KADAR BATAS) STRIPPING RATIO (NISBAH KUPAS) KADAR EKIVALEN BREAK EVEN CUTOFF GRADE (BECOG) INTERNAL CUTOFF GRADE (ICOG)
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CUTOFF GRADE
1. KADAR RATA-RATA TERENDAH
YANG MASIH BISA DITAMBANG BERDSRK KONDISI EKONOMI DAN TEKNOLOGI SAAT ITU
2. KADAR TERENDAH
YANG MASIH BISA DITAMBANG BERDSRK KONDISI EKONOMI DAN TEKNOLOGI SAAT ITU
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STRIPPING RATIO - SR (NISBAH KUPAS)
SR = NISBAH ANTARA JUMLAH MATERIAL PENUTUP DAN JUMLAH MATERIAL BIJIH
SR FUNGSI KADAR BATAS (COG)
TAMBANG BIJIH:
SR = TON WASTE PER TON ORE
SR = BCM WASTE PER TON ORE
SR = (TON TOTAL/TON ORE)-1
TAMBANG BATUBARA:
BCM OVERBURDEN PER TON COAL
MISAL SR 8:1 tidak 1:8!!!
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STRIP RATIO
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NORTH-SOUTH SECTION
Original Topography
2005 Surface
Ultimate Pit Surface
-540mLR
-90mLR
Phase 4
Phase 5
Phase 6
Ultimate Pit
NORTH-SOUTH SECTION
-180mLR
-300mLR
-390mLR
-540mLR
APAKAH HUBUNGAN ANTARA KADAR BATAS (COG) – HARGA KOMODITI – SR - CADANGAN
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BENTUK PIT – STRI P RATIO
RL-90
EAST DUMP
RL245
TONGOLOKA
NEWTS
KATALA
2005
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BREAK EVEN STRIPPING RATIO
NISBAH KUPAS PULANG POKOK
APABILA KADAR BIJIH DIKETAHUI
SEMUA KEUNTUNGAN BERSIH DIPAKAI UNTUK MENGUPAS MATERIAL PENUTUP
BERAPAKAH JUMLAH MATERIAL PENUTUP DAPAT DIKUPAS?
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BESR
BESR = (PENDAPATAN-ONGKOS TAMBANG&OLAH) PER TON BIJIH DIBAGI (ONGKOS KUPAS) PER TON WASTE
NILAI BESR = 0 PADA TITIK BECOG
REVENUE TIDAK DAPAT MENDUKUNG STRIPPING
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BESR VS SR
Phase 4
Phase 5
Phase 6
Ultimate Pit
NORTH-SOUTH SECTION
-180mLR
-300mLR
-390mLR
-540mLR
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BREAK EVEN CUTOFF GRADE
BERAPA “KADAR BIJIH” YANG MENGHASILKAN ANGKA YANG SAMA ANTARA PENDAPATAN DAN BIAYA UNTUK MENAMBANG DAN MEMPROSES
PENDAPATAN = BIAYA (TITIK PULANG POKOK)
DISEBUT KADAR BATAS PULANG POKOK (BECOG)
BECOG = ONGKOS (MINE+MILL+G&A) / (HARGA JUAL-SRF)(MILL REC)(SMELREC)(FAC)
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INTERNAL CUTOFF GRADE (ICOG)
RUMUS SAMA DENGAN BECOG TETAPI ONGKOS PENAMBANGAN (MINE) = 0
FAKTOR KOREKSI
% ke POUND (LB) = 20
UNTUK SATUAN METRIK, FAKTOR = 22.046
LOGAM MULIA (Au) TIDAK DIPERLUKAN FAKTOR: oz/ton, g/t
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PENGHASILAN = BIAYA (TITIK PULANG POKOK UNTUK 1 TON BIJIH) HARGA x KADAR x MILL REC x SMELT REC x 20 =
ONGKOS (MINE+MILL+G&A)+SRF x KADAR x MILL REC x SMELT REC x 20
(HARGA-SRF) x KADAR x MILL REC x SMELT REC x 20 =
ONGKOS (MINE+MILL+G&A)
BECOG = ONGKOS (MINE+MILL+G&A) (HARGA-SRF) x MILL REC x SMELT REC X 20
PERHITUNGAN KADAR BATAS Cu
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PERHITUNGAN KADAR BATAS Cu
ONGKOS PENAMBANGAN PER TON MATERIAL $0.750
ONGKOS PENGOLAHAN PER TON BIJIH $3.250
ONGKOS G&A PER TON BIJIH $0.250
PEROLEHAN PABRIK 94%
SMELTING REFINING FREIGHT PER lb PRODUK $0.275
PEROLEHAN SMELTER 96.15%
HARGA TEMBAGA PER lb (POUND) $0.950
BECOG = ONGKOS (MINE+MILL+G&A) (HARGA-SRF) x MILL REC x SMELT REC x 20
BECOG = $0.750 + $3.250 + $0.250 ($0.95-$0.275) x 0.94 x 0.9615 x 20
BECOG= 0.35% TUGAS HITUNGLAH ICOG!
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TUGAS CUTOFF CALCULATION
COSTS: mining : $1.00/ton materl processing : $4.00/ton ore G$A : $0.75/ton ore Refining & Freight : $5.00/oz REVENUE: commodity price : $ 425/oz recovery : 75% HITUNGLAH: 1. BECOG 2. ICOG! Untuk apa diperlukan ICOG
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KADAR EKIVALEN
DALAM CEBAKAN BIJIH TERDAPAT LEBIH DARI SATU MINERAL
ADA MINERAL UTAMA DAN IKUTAN
DALAM KADAR EKIVALEN :
ADA ISTILAH NSR DAN SRF
NSR = NET SMELTER RETURN
ADALAH NILAI KOTOR DARI SATU TON BIJIH SETELAH DIKURANGI ONGKOS-ONGKOS SRF
SRF =SMELTING – REFIN ING - FREIGHT
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TAHAPAN PERHITUNGAN KADAR EKIVALEN MISAL Cu EKIVALEN (CuEq)
1. HITUNG NSR 1 TON mineral utama (TEMBAGA) DG KADAR BIJIH 1%
2. HITUNG NSR 1 TON MINERAL IKUTAN
MISAL: MOLY DG KADAR 1% atau
EMAS DG KADAR 1 oz/ton ATAU 1 g/t
3. HITUNG FAKTOR EKIVALENSI =
NISBAH NSR MINERAL IKUTAN DAN MINERAL UTAMA
4. KADAR EKIVALEN = TOTAL Cu + FAKTOR x MOLY
5. BILA DALAM BLOK DIKETAHUI KADAR TOTAL Cu DAN KADAR MOLY (EMAS, PERAK) MAKA KADAR CuEq DARI BLOK TERSEBUT DAPAT DIHITUNG
KADAR EKIVALEN = KADAR YG MENGHASILKAN GABUNGAN NILAI NSR DARI SEMUA MINERAL YANG ADA
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PERHITUNGAN KADAR EKIVALEN
APABILA DIKETAHUI:
TEMBAGA MOLY
HARGA KOMODITAS $ 0.900 $ 3.000
PEROLEHAN PABRIK 88% 70%
PEROLEHAN SMELTER
(KONVERTER) 96.1% 99%
BIAYA SMELTING
KONVERSI KE POUND $ 0.324 $ 0.810
(LB)
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PROSEDUR PERHITUNGAN
1. HITUNG NSR 1 TON BIJIH DGN KADAR 1%Cu:
($0.90/lb-$0.324/lb)(1%)(0.88)(0.961)(20lb/%) = $ 9.74
2. HITUNG NSR 1 TON BIJIH DGN KADAR 1% MOLY
($3.0/lb-$0.81/lb)(1%)(0.70)(0.99)(20lb/%) = $30.35
3. FAKTOR EKIVALEN = NSR MOLY/NSR TEMBAGA
$30.35 / $9.74 = 3.1160
4. TEMBAGA EKIVALEN = KADAR Cu + (3.1160 x KADAR MOLY)
DALAM MODEL BLOK SERING MEMAKAI NILAI NSR drpd KADAR EKIVALEN
PEROLEHAN MILL DAN SMELTER, ONGKOS: SRF, HARGA KOMODITAS SUDAH DIPERHITUNGKAN DALAM NSR