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Russia
Oroch Mine (Omolon hub Operation)

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 Location:
129 km N from Evensk, Russia

  Regional Office:
Prospect Narodnogo Opolcheniya 2
St. Petersburg
Russia
198216
Phone  ...  Subscription required
Fax+7.812.753.6376
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Counter current decantation (CCD)
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Lichkvaz, Oroch, Sopka Kvartsevaya, Dalneye and Irbychan mines are classified as discontinued operations.


Owners & OPERATOR

Source: p. 59
CompanyInterestOwnership
Polymetal International plc 100 % Indirect
Omolon Gold Mining Company LLC. (operator) 100 % Direct
Polymetal International plc held Oroch through its 100% subsidiary Omolon Gold Mining Company LLC.

Deposit Type

  • Epithermal


Summary:

Oroch was discovered in 1979 and was extensively explored from 1980 to 2005 through diamond drilling. It is located 110 km from Kubaka and approximately 20 km from the Kubaka-Sopka winter road. Oroch is an epithermal gold-silver deposit. The ore bodies are mainly composed of quartz and carbonate. They have a steep dip and an average width of 6 m.

The Okhotsk-Chukot volcanic belt formed over 25 Ma (middle Albian-Cenomanian) at the boundary between the continental Verkhoyansk-Chukot and Koryak-Kamchatka terranes (Fig.1). This giant belt is 3000 km long is composed of subaerial volcanic rocks.

Relative to the oceanic margin, the Okhotsk Chukot belt is divided into the inner, outer, and perivolcanic zones. The intricate structure of terranes of the basement and the Okhotsk Chukot belt produced a diversity of epithermal deposit types. The inner zone of the belt mainly accommodates porphyry Cu-Mo deposits. The outer and perivolcanic zones include gold silver and silver-tin ore deposits. The gold silver subtype is more widespread in the outer zone (Karamken, Valunisty, Kupol, and Dvoinoi). Deposits of the silver subtype (Dukat, Lunnyi, Arylakh, Golcovy and others) are confined to the volcanic rift located between the Yana Kolyma and Omolon terranes of the Okhotsk Chukot belt.


Mining Methods

  • Truck & Shovel / Loader


Summary:

At Oroch, open-pit mining commenced with a total of 400 Kt of ore mined, ahead of original schedule. The additional volumes will enable optimised throughput at the Kubaka mill in 2016.


Crushing and Grinding


Processing

  • Heap leach
  • Counter current decantation (CCD)
  • 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:

Metrics2017
Ore tonnes mined  ......  Subscription required
Waste  ......  Subscription required

Reserves at December 31, 2018:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 250 kt Gold 3.7 g/t 29 koz
Proven Stockpiles 250 kt Silver 155 g/t 1,229 koz
Proven Stockpiles 250 kt Gold Equivalent 5.3 g/t 42 koz
Measured Stockpiles 480 kt Gold 1.2 g/t 19 koz
Measured Stockpiles 480 kt Silver 51 g/t 795 koz
Measured Stockpiles 480 kt Gold Equivalent 1.7 g/t 27 koz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 4, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2016
Project Description 2016
Annual Report 2015
Subscription required - Subscription is required.

Aerial view:

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