Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
|
Processing |
- Counter current decantation (CCD)
- Agitated tank (VAT) leaching
- 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. |
Latest News | Thiess awarded $225m contract by BHP for Rocky’s Reward June 22, 2018 |
Source:
p. 81
Polymetal International plc holds Omolon hub through its 100% subsidiary Omolon Gold Mining Company LLC.
Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
Tsokol is a highly weathered near-surface vein deposit with almost vertical adularia-quartz veins form a continuous mineralised zone. It was first discovered in 1984. Ore shoots within the vein structure are on average 4 m wide, up to 110 m high and vary in length from 50 to 90 m. The ore is free-milling and is expected to yield gold recoveries of up to 95 per cent.
[https://miningcareersonline.com/reports/annual/Polymetal_International_Omolon_geology_web_2020.jpg]
Gold–silver mineralization in Northeast Asia is controlled by 9-th volcanic belts of different ages that are superimposed on cratonic, passive continental-margin, island-arc, and oceanic terranes. The brief overview of volcanic belts in Northeast Asia presented in this communication shows that the mineralogy of the epithermal gold-silver deposits in these belts depends on the metallogeny and composition of rocks in structures of the basement and, probably, the Precambrian basement.
Summary:
At Tsokol, the underground development decreased by 7% year-on-year with 152 Kt of ore mined and a 29% decrease in the average gold grade to 7.3 g/t. The mine is winding down ahead of expected pillar removal operations during 2019–2020.
Processing
- Counter current decantation (CCD)
- Agitated tank (VAT) leaching
- Carbon in pulp (CIP)
- Merrill–Crowe
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Source:
Summary:
The Kubaka plant currently uses only conventional CIP cyanidation technology. Run-of-mine ore is crushed in a jaw crusher, followed by two-stage milling (SAG mill and ball mill), thickening, CIP leaching, desorption, electrolysis, carbon regeneration and doré smelting. This processing option will continue to be utilised in the long term for ores with low silver content, such as ores from the Birkachan and Tsokol mines.
Combined production numbers are reported under
Omolon hub Operation
Operational Metrics:
Metrics | 2019 | 2018 | 2017 |
Ore tonnes mined
| ......  | ......  | 153 kt |
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Reserves at January 1, 2020:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
370 kt
|
Gold
|
5 g/t
|
59 koz
|
Proven
|
370 kt
|
Silver
|
7 g/t
|
83 koz
|
Proven
|
370 kt
|
Gold Equivalent
|
5 g/t
|
59 koz
|
Probable
|
90 kt
|
Gold
|
5.9 g/t
|
18 koz
|
Probable
|
90 kt
|
Silver
|
9 g/t
|
28 koz
|
Probable
|
90 kt
|
Gold Equivalent
|
6 g/t
|
18 koz
|
Proven & Probable
|
460 kt
|
Gold
|
5.1 g/t
|
76 koz
|
Proven & Probable
|
460 kt
|
Silver
|
7 g/t
|
111 koz
|
Proven & Probable
|
460 kt
|
Gold Equivalent
|
5.2 g/t
|
77 koz
|
Measured
|
110 kt
|
Gold
|
9.6 g/t
|
31 koz
|
Measured
|
110 kt
|
Silver
|
10 g/t
|
34 koz
|
Measured
|
110 kt
|
Gold Equivalent
|
9.7 g/t
|
32 koz
|
Indicated
|
10 kt
|
Gold
|
6.1 g/t
|
2 koz
|
Indicated
|
10 kt
|
Silver
|
11 g/t
|
4 koz
|
Indicated
|
10 kt
|
Gold Equivalent
|
6.2 g/t
|
2 koz
|
Inferred
|
30 kt
|
Gold
|
9.2 g/t
|
10 koz
|
Inferred
|
30 kt
|
Silver
|
15 g/t
|
16 koz
|
Inferred
|
30 kt
|
Gold Equivalent
|
9.3 g/t
|
10 koz
|
Total Resource
|
150 kt
|
Gold
|
9.2 g/t
|
43 koz
|
Total Resource
|
150 kt
|
Silver
|
11 g/t
|
54 koz
|
Total Resource
|
150 kt
|
Gold Equivalent
|
9.3 g/t
|
44 koz
|
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