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Indonesia
Kencana Mine (Gosowong Operation)

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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
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Underhand Cut & Fill
  • Longhole stoping
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)
The Gosowong operation comprises the Kencana and Toguraci underground mines and processing plant at Gosowong, which has a capacity of up to 800,000 tonnes per year.


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.

The Kencana mineralised system is a complex intersecting network of structures consisting of well-developed epithermal vein zones (K1 and K2) and link structures. The (K1) Kencana deposit was discovered in 2002 and gold production commenced in early 2006. Since June 2009, production has been mainly from the Kencana K2 and K-Link systems as well as from the K1 orebody.


Mining Methods

  • 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
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • 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.


Combined production numbers are reported under Gosowong Operation


Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Probable 0.82 Mt Gold 6.3 g/t 0.17 M oz
Probable 0.82 Mt Silver 6 g/t 0.16 M oz
Indicated 1.2 Mt Gold 10 g/t 0.38 M oz
Indicated 1.2 Mt Silver 9.6 g/t 0.36 M oz
Inferred 0.33 Mt Gold 9.3 g/t 0.099 M oz
Inferred 0.33 Mt Silver 7.6 g/t 0.081 M oz
Total Resource 1.5 Mt Gold 9.9 g/t 0.48 M oz
Total Resource 1.5 Mt Silver 9.2 g/t 0.44 M oz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 10, 2019
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2016
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Subscription required - Subscription is required.

Aerial view:

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