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Russia
Tsokol Mine (Omolon hub Operation)

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 Location:
201 km N from Evensk, Russia

  Regional Office:
Prospect Narodnogo Opolcheniya 2
St. Petersburg
Russia
198216
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Fax+7-812-753-6376
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Pillar mining
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 NewsThiess awarded $225m contract by BHP for Rocky’s Reward     June 22, 2018


Owners & OPERATOR

Source: p. 81
CompanyInterestOwnership
Polymetal International plc 100 % Indirect
Omolon Gold Mining Company LLC. (operator) 100 % Direct
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.


Mining Methods

  • Pillar mining


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.


Crushing and Grinding


Processing

  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

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:

Metrics201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required153 kt
Subscription required - Subscription is required.

Reserves at January 1, 2020:

CategoryTonnage CommodityGradeContained 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


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 8, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 8, 2020
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Quarterly Report 2018
Project Description 2016
Annual Report 2012
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News:

NewsDate
Thiess awarded $225m contract by BHP for Rocky’s Reward June 22, 2018

Aerial view:

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