Overview
Stage | Production |
Mine Type | Open Pit / Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Open stoping
|
Processing |
- Heap leach
- Agitated tank (VAT) leaching
- Counter current decantation (CCD)
- Carbon in pulp (CIP)
- Merrill–Crowe
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
The hub comprises of the Kubaka processing plant, three operating mines - Tsokol, Birkachan, Olcha as well as several near-mine development projects with high-grade open-pittable reserves and significant long-term potential. |
Source:
p. 81
Polymetal International plc holds Omolon hub through its 100% subsidiary Omolon Gold Mining Company LLC.
Deposit Type
- Epithermal
- Breccia pipe / Stockwork
- Vein / narrow vein
- Volcanic hosted
Summary:
The Birkachan mineralisation is located in a 150 to 200 m wide zone. The mineralisation comprises two distinct types: gold-silver veins and disseminated stockwork. The individual veins generally have an average width of up to 2-8 m, extend up to 200-250 m along strike and down-dip and carry gold grades of up to 8 to 14 g/t. The stockwork comprises mineralised zones of 60 to 80 m thick extending 2.5 km along strike and 150 to 200 m down-dip from the surface and grading 1 to 3 g/t of gold. [http://www.minesandprojects.com/reports/annual/Polymetal_International_Omolon_geology_web_2020.jpg]
The Kedon marginal volcanic belt formed on the continental crust in the Middle Paleozoic during a period of 30-35 Ma. Relicts of this volcanic belt are retained as fragments in the Omolon cratonic terraine. The belt is composed of differentiated subaerial red-colored volcanic rocks coupled with compositionally similar subvolcanic and hypabyssal intrusions. The volcanic rocks belong to the calc-alkaline series. There are two types of epithermal volcanic mineralization in the Kedon volcanic belt. Gold mineralization (Au/Ag=1:1-1:5) is developed in the Kubaka, Birkachan, and Elochka deposits. Whereas the gold-silver mineralization (Au/Ag=1:10-1:50) is developed in the Sedoi, Yunyi and Ol'cha deposits. The large Kubaka and Birkachan deposits are characterized by a low content of sulfides (<0.1 and 0.1-0.5%, respectively). The ores are mainly composed of gold, electrum, and pyrite.
Mining Methods
- Truck & Shovel / Loader
- Open stoping
Summary:
Following a successful in-fill drilling campaign, open-pit mining recommenced at the Birkachan mine (Omolon) with a view to extending the operation of the heap leach facility.
Kubaka mill processed larger volumes of higher grade ore from the Birkachan and Olcha underground mines.
Processing
- Heap leach
- Agitated tank (VAT) leaching
- Counter current decantation (CCD)
- Carbon in pulp (CIP)
- Merrill–Crowe
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Source:
Summary:
The hub comprises of the Kubaka processing plant, three operating mines - Tsokol, Birkachan, Olcha as well as several near-mine development projects with high-grade open-pittable reserves and significant long-term potential. All parts of the hub are centred around the 850 Ktpa Kubaka CIP plant, which serves as the processing facility for operating mines in the area and future near-mine feedstock. In addition, the Company operates a 1 Mtpa seasonal heap leaching circuit at the Birkachan mine.
Combined production numbers are reported under
Omolon hub Operation
Operational Metrics:
Metrics | 2019 | 2018 |
Annual processing capacity
| ......  | ......  |
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Reserves at January 1, 2020:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
3,610 kt
|
Gold
|
2.2 g/t
|
260 koz
|
Proven
|
3,610 kt
|
Silver
|
7 g/t
|
862 koz
|
Proven
|
3,610 kt
|
Gold Equivalent
|
2.3 g/t
|
269 koz
|
Probable
|
700 kt
|
Gold
|
7.4 g/t
|
166 koz
|
Probable
|
700 kt
|
Silver
|
23 g/t
|
518 koz
|
Probable
|
700 kt
|
Gold Equivalent
|
7.6 g/t
|
171 koz
|
Proven & Probable
|
4,310 kt
|
Gold
|
3.1 g/t
|
426 koz
|
Proven & Probable
|
4,310 kt
|
Silver
|
10 g/t
|
1,380 koz
|
Proven & Probable
|
4,310 kt
|
Gold Equivalent
|
3.2 g/t
|
440 koz
|
Measured
|
410 kt
|
Gold
|
1.4 g/t
|
19 koz
|
Measured
|
410 kt
|
Silver
|
5 g/t
|
71 koz
|
Measured
|
410 kt
|
Gold Equivalent
|
1.5 g/t
|
19 koz
|
Indicated
|
160 kt
|
Gold
|
14.7 g/t
|
74 koz
|
Indicated
|
160 kt
|
Silver
|
23 g/t
|
113 koz
|
Indicated
|
160 kt
|
Gold Equivalent
|
14.9 g/t
|
75 koz
|
Total Resource
|
570 kt
|
Gold
|
5.1 g/t
|
92 koz
|
Total Resource
|
570 kt
|
Silver
|
10 g/t
|
185 koz
|
Total Resource
|
570 kt
|
Gold Equivalent
|
5.2 g/t
|
94 koz
|
Mine Management:
Job Title | Name | Profile | Ref. Date |
.......................
|
.......................
|
|
Jul 8, 2020
|
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Aerial view:
- Subscription is required.