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Indonesia
Tembang Mine

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 Location:
112 km N from Bengkulu, Indonesia

  Regional Office:
International Finance Centre 9th Floor Jl. Jendral Sudirman Kav. 22-23
Jakarta
Indonesia
12920
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusInactive / Suspended
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Bench stoping
Production Start...
In 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

Source:
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.

Contractors

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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.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole stoping
  • Bench stoping


Summary:

The current Tembang life-of-mine plan is based on the five open pit mines at Berenai, Asmar, Tembang, Buluh-Siamang and Bujang, with the Belinau underground mine developed via decline from the former Belinau open pit.

The underground mine plan for Belinau provides access to the vein lenses via decline from surface. The decline has been developed from inside the existing Belinau open pit, well above the pit bottom to deal with high intensity rainfall events, which are common in the region. The total length of the decline will be approximately 1,360 metres with a 1-in-7 gradient taking the mine to a depth of around 235 metres. Mining is by long-hole stoping with backfill, retreating from the vein limits back to the access crosscut. The mining method is a combination of top down conventional stoping along to the west and to the east and a slight variation to the typical Avoca or bench stoping method, with a 3m bench cut into the ore drive floor on each planned cemented aggregate fill (CAF) level. The mining method reflects the vertical nature of the wall rock and competent host rock either side of the vein. It is expected that approximately 40% of ore production will be from development and 60% from long-hole stoping. Development and operations at Belinau are currently on an ‘owner-operator’ basis.


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits20172016
Gold oz 26,47925,245
Silver oz  ......  Subscription required  ......  Subscription required
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

Reserves at December 31, 2017:

CategoryTonnage CommodityGradeContained Metal
Proven 0.016 Mt Gold 8.16 g/t 0.004 M oz
Proven 0.016 Mt Silver 63.4 g/t 0.033 M oz
Probable 1.26 Mt Gold 2.28 g/t 0.092 M oz
Probable 1.26 Mt Silver 26.5 g/t 1.073 M oz
Proven & Probable 1.276 Mt Gold 2.35 g/t 0.096 M oz
Proven & Probable 1.276 Mt Silver 26.9 g/t 1.105 M oz
Measured 0.04 Mt Gold 11.61 g/t 0.015 M oz
Measured 0.04 Mt Silver 110.9 g/t 0.141 M oz
Indicated 3.115 Mt Gold 2.03 g/t 0.204 M oz
Indicated 3.115 Mt Silver 27.9 g/t 2.798 M oz
Inferred 2.647 Mt Gold 1.67 g/t 0.143 M oz
Inferred 2.647 Mt Silver 17.4 g/t 1.484 M oz
Total Resource 6.02 Mt Gold 1.65 g/t 0.309 M oz
Total Resource 6.02 Mt Silver 22.1 g/t 4.13 M oz

Commodity Production Costs:

CommodityUnits20172016
Credits (by-product) Gold USD -97 / oz   -236 / oz  
Cash costs Gold USD 1,104 / oz†   1,039 / oz†  
All-in sustaining costs (AISC) Gold USD 1,337 / oz†   1,268 / oz†  
† Net of By-Product.

Financials:

Units20172016
Revenue M USD 32.6   34.3  
Operating Income M USD -19.6   -17.3  
Gross profit M USD -11.5   -7.9  
Pre-tax Income M USD -25   -28.6  



Heavy Mobile Equipment:

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Staff:

EmployeesYear
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2017
Annual Report 2016
Press Release 2015
Feasibility Study Report 2014
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