Overview
| Stage | Construction |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Cut & Fill
- Longhole open stoping
- Bench stoping
- Paste backfill
|
| Mine Life | 15 years (as of Jan 1, 2015) |
The Anjing Hitam and Lae Jahe mine sites concessions combined contain one of the best quality zinc in the world (11.5% Zn; 6.8% Pb).
Constructing the infrastructure facilities and securing the funding for Anjing Hitam mine site. |
Source:
p. 86,87
PT Bumi Resources Minerals Tbk. holds 49% in PT Dairi Prima Mineral and China Nonferrous Metal Industry’s Foreign Engineering & Construction Co. Ltd holds 51% in PT Dairi Prima Mineral.
Composition of the PT Bumi Resources Minerals Tbk’s Shareholders as of December 31, 2021:
- PT Bumi Resources Tbk (22,07%);
- Emirates Tarian Global Ventures Spc (22,25%);
- 1st Financial Company Limited (11,04%);
- Wexler Capital Pte Ltd (8,91%);
- Sugiman Halim (6,49%);
- CIMB Securities Limited (5,13%);
- Public (24,11%).
Contractors
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Deposit Type
- Vein / narrow vein
- Breccia pipe / Stockwork
- SEDEX
Summary:
Zinc-Pb orebodies in the Dairi deposit are distributed along a 4-km SE-NW strike in the eastern flank of the Sopokomil Dome. From top downward, the rocks in the Sopokomil Dome consists of interbedded calcareous siltstones-sandstones (Dagang unit), interbedded carbonaceous shales-calcareous siltstones (Julu unit) and massive as well as brecciated dolostones (Jehe unit).
The Anjing Hitam prospect is situated in the southeastern portion of the Dairi deposit. At the Anjing Hitam prospect, orebodies are hosted in the Julu unit and display stratiform and concordant morphologies.
Two mineralized horizons are present, namely the upper and main mineralized horizons. The upper mineralized horizon occurs as lenses and it is sporadically distributed throughout the prospect while the main mineralized horizon is continuous. The orebodies attain maximum thickness of 30 m in the main mineralized horizon.
The Dagang and Julu units are composed of quartz, carbonate minerals, muscovite and organic matter. Quartz and carbonate minerals are dominant in the sandstones and siltstones layers of the Dagang and Julu units while muscovite and organic matter are dominant in the shales layers of the Julu unit. Zircon and sphalerite occur in trace amounts in the Dagang and Julu units.
According to ore minerals abundance and their textural relationship, the Anjing Hitam prospect hosts five ore types: (1) pyrite-rich massive ore, (2) sphalerite-rich massive ore, ( ........
Mining Methods
- Cut & Fill
- Longhole open stoping
- Bench stoping
- Paste backfill
Summary:
There will be three portals: haulage, service and ventilation. The portals will be accessed via a surface haul road and mined conventionally (drill and blast). Mining methods will be mainly long hole open stoping, primary-secondary longitudinal bench stoping and cut & fill.
Mining voids will be filled with paste fill which will prevent subsidence, maximize resource recovery and limit the size of the tailings storage facility (TSF). Ore and waste will be trucked to the surface via the haulage decline to a run of mine (ROM) ore transit storage area.
Waste rock will be used for the backfill of avoids in the mine and for the construction of the TSF. Ground support will be a combination of bolts and mesh, shotcrete/fibrecrete, cable bolting, rock fill and paste fill.
The ventilation circuit will consist of two (2) fresh air intakes via haulage and service portals and a series of rises to bring fresh air to the production areas. Exhaust is via a parallel system of ventilation rises and drives connected to the ventilation portal.
Water management will consist of development sumps, transfer sumps and pumps, including a main pumping station and a surface settlement pond.
Source:
Flow Sheet:
Summary:
- subscription is required.
Projected Production:
| Commodity | Units | Avg. Annual |
|
Zinc
|
kt
| 225 |
|
Lead
|
kt
| ...... |
All production numbers are expressed as concentrate.
Operational Metrics:
| Metrics | |
|
Annual processing capacity
| ...... |
|
Ore tonnes mined, LOM
| ...... |
* According to 2021 study.
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Reserves at February 1, 2011:
The Mineral Reserves and Resources as at 31th December 2022 at Anjing Hitam - Lae Jahe are unchanged from February 01, 2011.
| Category | Tonnage | Commodity | Grade |
|
Proven & Probable
|
11.05 Mt
|
Zinc
|
11.5 %
|
|
Proven & Probable
|
11.05 Mt
|
Lead
|
6.8 %
|
|
Total Resource
|
25.1 Mt
|
Zinc
|
10.1 %
|
|
Total Resource
|
25.1 Mt
|
Lead
|
6 %
|
Commodity Production Costs:
| | Commodity | Units | Average |
|
Assumed price
|
Zinc
|
USD
|
......
|
* According to 2020 study / presentation.
Heavy Mobile Equipment as of August 18, 2022:
| HME Type | Size |
|
Crane
|
50 t
|
|
Drill jumbo (two boom)
|
|
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