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Indonesia
Gosowong Operation (Kencana Mine, Toguraci Mine)

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 Location:
36 km NE from Sidangoli, Indonesia

  Regional Office:
Gedung Aneka Tambang Jl. Letjen TB Simatupang No. 1 Lingkar Selatan, Tanjung Barat
Jakarta
Indonesia
12530
Phone  ...  Subscription required
Fax(62-21)-789-1224
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole stoping
Processing
  • Gravity separation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2 years (as of Jan 1, 2019)
Latest NewsNewcrest completes sale of Gosowong mine     March 5, 2020


Owners & OPERATOR

Source: p. 1
CompanyInterestOwnership
PT Antam (Persero) Tbk 25 % Indirect
PT Indotan Halmahera Bangkit (Indotan) 75 % Indirect
PT. Nusa Halmahera Minerals (operator) 100 % Direct

Deposit Type

  • Epithermal


Summary:

All economic mineralisation at Gosowong is of low sulphidation epithermal type occurring as mineralised fault systems resulting from high temperature gold and silver bearing hydrothermal fluids. The ore shoots are narrow and approximately planar although irregular and complex in local detail. The deposits are relatively moderate to low in dip averaging around 40-50 degrees in the Kencana – Gosowong structural corridor and sub-vertical in the Toguraci corridor. Silver to gold ratio in the ore is approximately 1:1.


Mining Methods

  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole stoping


Summary:

The Kencana underground mine utilises predominantly underhand cut-and-fill with some long hole stoping while the Toguraci underground mine uses long hole stoping and overhand cut-and-fill.


Crushing and Grinding


Processing

  • Gravity separation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

The processing plant at Gosowong, which has a capacity of up to 800,000 tonnes per year, comprises a primary jaw crusher followed by a SAG and ball mill circuit and a Vertimill circuit. The ore then undergoes a conventional cyanide leaching process. Gold and silver is recovered from the cyanide solution using the Merrill-Crowe zinc precipitation process and smelted to produce gold and silver doré. The gold doré is then refined at Logam Mulia which is owned by Newcrest’s joint venture partner PT Aneka Tambang.

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 8.7711.51713.214.5
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required296197332
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required484 kt878 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required416 kt716 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required479 kt738 kt
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required800 kt
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Probable 1.4 Mt Gold 8.1 g/t 0.37 M oz
Probable 1.4 Mt Silver 12 g/t 0.54 M oz
Indicated 2.8 Mt Gold 10 g/t
Indicated 2.8 Mt Silver 15 g/t
Inferred 0.57 Mt Gold 9.2 g/t
Inferred 0.57 Mt Silver 11 g/t
Total Resource 3.3 Mt Gold 10 g/t 1.1 M oz
Total Resource 3.3 Mt Silver 14 g/t 1.5 M oz

Commodity Production Costs:

CommodityUnits20192018201720162015
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 757 / oz† 935 / oz† 719 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 414  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 187  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 214  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required Subscription required 2019
Subscription required Subscription required 2018
Subscription required Subscription required 2017
Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Corporate Presentation 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Fact Sheet 2015
Other 2015
Fact Sheet 2013
Subscription required - Subscription is required.

News:

NewsDate
Newcrest completes sale of Gosowong mine March 5, 2020
Newcrest to divest Gosowong for $90m February 3, 2020
Newcrest stays on track for Gosowong sale August 19, 2019

Aerial view:

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