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Indonesia
Gosowong Operation

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 Location:
36 km NE from Sidangoli, Indonesia

  Address:
Gosowong Gold Mine, Halmahera Island
Indonesia
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Fax(62) (21) 29049919
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Overhand Cut & Fill
  • Longhole stoping
Production Start...
Mine Life5 years (as of Jan 1, 2021)
The Gosowong operation comprises Kencana mine and Toguraci mine.

No production data is publicly available since Newcrest completed the sale of 100% of Newcrest Singapore Holdings Pte Ltd (NSH) to Indotan Halmahera Bangkit (Indotan) on 5 March 2020.


Owners

Source:
CompanyInterestOwnership
PT Antam (Persero) Tbk 25 % Indirect
PT Indotan Halmahera Bangkit (Indotan) 75 % Indirect
PT. Nusa Halmahera Minerals (operator) 100 % Direct
Pt Nusa Halamhera Minerals (NHM) is the joint venture Indonesian company formed to manage the Gosowong Gold Mine.

Newcrest Mining Limited h owned 75 per cent interest in Gosowong’s mining operator, PT Nusa Halmahera Minerals until 5th March 2020. On 5 March 2020, Newcrest completed the sale of 100% of Newcrest Singapore Holdings Pte Ltd (NSH) to Indotan Halmahera Bangkit (Indotan). The remaining 25% owns PT. Aneka Tambang.

Contractors

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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.

The Toguraci low sulphidation epithermal gold vein deposits are located 2 km south west of the Gosowong mine and form part of the Gosowong Goldfield. The vein structures at Toguraci are narrow with horizontal widths typically ranging between 0.1m and 5m.

The Kencana mineralised system is a complex intersecting network of structures consisting of well-developed epithermal vein zones (K1 and K2) and link structures.


Mining Methods

  • Overhand Cut & Fill
  • Longhole stoping


Summary:

The open-pit method mining operation in Gosowong has been completed, and currently Gosowong Gold Mine is actively conducting mining activities on its two underground production areas; Kencana, and Toguraci, by combining the mining methods of overhand cut and fill, and stoping.

Kencana Underground Mine commenced its operations in July 2005 and has been productive until today. While Toguraci is another active production area in Gosowong with characteristics unlike other underground mining operations, as the underground area of Toguraci contains geothermal manifestation in the form of hot water source.

The underground mining department of PTNHM operates this mining unit by an extra-effort management. In addition to dewatering procedure, or to pump the resulted hot water out of the mine, it needs to conduct air cooling using an underground air cooler unlike the typical one found in most mines.

These dewatering and air cooling activities are conducted around the clock. The hot water is pumped out of the mining site and stored at a settlement pond for cooling process before channeled into nature.


Crushing and Grinding
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Processing

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Summary:

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Production:
2020 production from Gosowong is shown up to the divestment date of 4 March 2020.

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required251,390295,876197,463331,555
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Total tonnes mined 808 kt767 kt664 kt484 kt878 kt
Ore tonnes mined 690 kt679 kt564 kt416 kt716 kt
Tonnes milled 708 kt704 kt565 kt479 kt738 kt
Plant annual capacity 800 kt800 kt800 kt

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Probable 1.2 Mt Gold 7.5 g/t 0.3 M oz
Probable 1.2 Mt Silver 11 g/t 0.43 M oz
Indicated 2.7 Mt Gold 10 g/t
Indicated 2.7 Mt Silver 14 g/t
Inferred 0.41 Mt Gold 8.2 g/t
Inferred 0.41 Mt Silver 11 g/t
Total Resource 3.1 Mt Gold 10 g/t 1 M oz
Total Resource 3.1 Mt Silver 14 g/t 1.3 M oz

Commodity Production Costs:

CommodityUnits2019201820172016
All-in sustaining costs (sold) Gold USD  ......  Subscription required† 882 / oz†   757 / oz†   935 / oz†  
† Net of By-Product.

Financials:

Units20202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required 25   33   48  
Revenue M USD  ......  Subscription required 351   350   257  
EBIT M USD  ......  Subscription required 58   79   48  
EBITDA M USD  ......  Subscription required 148   177   87  
Operating Cash Flow M USD  ......  Subscription required 146   186   102  



Heavy Mobile Equipment as of December 14, 2020:
HME TypeModelQuantity
Loader ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2022
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 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Year-end Mineral Reserves 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.

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