Indonesia

Tembang Mine

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Overview

Mine TypeOpen Pit & Underground
StatusInactive / Suspended
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Bench stoping
Production Start... Lock
SnapshotIn 2018, the Company has reserved investment losses for all investment values in Sumatra Copper and Gold Plc. related to the suspension of operation at PT Dwinad Nusa Sejahtera (Dwinad), a subsidiary of SUM. Dwinad continues to discuss with its Lenders and stakeholders about restructuring options.

Owners

SourceSource
CompanyInterestOwnership
Sumatra Copper & Gold plc 100 % Indirect
PT Dwinad Nusa Sejahtera (operator) 100 % Direct
The Tembang Project is owned by PT Dwinad Nusa Sejahtera (PT DNS), an Indonesian Foreign Direct Investment Company (PMA) which holds the mining permits (IUPs) over the Project area. PT DNS is a wholly-owned subsidiary of Sumatra Copper & Gold plc.

Deposit type

  • Breccia pipe / Stockwork
  • Epithermal

Summary:

Tembang encompasses an extensive low-sulphidation epithermal system comprising northwest and northeast trending, gold-silver bearing quartz sulphide veins hosted in Miocene intrusive volcanic and volcaniclastic rocks. Tembang is believed to be focused within a zone of dilation created by faulting associated with the Trans Sumatra Fault Zone that parallels the Sumatran volcanic arc.

Individual vein lodes have strike lengths of between 200 and 500m, however mineralised trends are observed to be greater than 1km. Vein widths are typically less than 2m, however at Berenai vein lodes or complexes are greater than 5m and locally up to 10m. Gold-silver mineralisation is found associated with quartz chalcedony veins, vein breccias and vein stockworks with a low sulphide content. The veins display typical epithermal characteristics including crustiform-colloform banding, silica pseudomorphs after bladed calcite, adularia, amethyst and bands of fine grained dark sulphides.

The depth extent of the economic mineralisation outlined to date appears to be approximately 300 metres, however several high grade vein lodes have not been closed off at depth. As such, the potential for resource growth is considered to be high in that most known deposits remain open at depth, along with a pipeline of prospective near mine exploration targets.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

CommodityUnits20172016
Silver oz 153,492392,417
All production numbers are expressed as metal in doré.

Operational metrics

Metrics20172016
Ore tonnes mined 255,405 t388,759 t
Tonnes milled 256,491 t378,024 t

Production Costs

CommodityUnits2017
Credits (by-product) Gold USD -97 / oz  
Cash costs Gold USD 1,104 / oz **  
All-in sustaining costs (AISC) Gold USD 1,337 / oz **  
** Net of By-Product.

Financials

Units2017
Revenue M USD 32.6  
Operating Income M USD -19.6  
Gross profit M USD -11.5  
Pre-tax Income M USD -25  

Heavy Mobile Equipment

Fleet data has not been reported.

Aerial view:

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