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Turkey
Oksut Mine

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 Location:
48 km S from Kayseri, Turkey

  Address:
Yedek Mahallesi 349. Ada 7 Numarali Parsel 504. Sokak No:701
Develi/Kayseri
Turkey
Phone  ...  Subscription required
Fax+90 312-442-88-30
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  • Overview
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  • Mining
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2015)
The Öksüt Mine achieved first gold pour on January 31, 2020.
Latest NewsCenterra Gold Announces Commercial Production at Öksüt     June 2, 2020


Owners & OPERATOR

Source: p. 4
CompanyInterestOwnership
Centerra Gold Inc. 100 % Indirect
Öksüt Madencilik Sanayi ve Ticaret A.S. (operator) 100 % Direct

Deposit Type

  • Porphyry
  • Epithermal


Summary:

The Öksüt Project is a high-sulphidation epithermal gold deposit within the Central Anatolian Volcanic Province, part of the Tethyan Metallogenic Belt. The belt extends from southeastern Europe across Turkey, the Caucasus, and on into Pakistan and contains a number of important gold and porphyry copper deposits. Magmatic activity and related ore forming processes are the result of the closure of the Tethyan Ocean in response to the collision between the northmoving Arabian Plate with the Eurasian Plate that began in the late Cretaceous period and continues today.

Öksüt gold mineralization is hosted within the Develidag Volcanic Complex, one of the numerous stratovolcanoes situated along the Central Anatolian Fault Zone (CAFZ). The volcanic complex is composed of Miocene basaltic-andesitic volcanic domes, pyroclastic rocks, and lava flows. Flow- banded Pliocene andesite overlies these sequences and the Öksüt mineralization to the north and east.

There are several gold occurrences in the Öksüt Project area, the most important of which is the Keltepe Deposit. The distribution of the alteration assemblages and the gold grades at the Keltepe Deposit are strongly zoned, with a central massive silica breccia having the highest gold grade. This core is surrounded by quartz-alunite altered volcanic rocks, and as the alteration intensity diminishes outwardly, the gold grade decreases.

The Keltepe Deposit has been oxidized to depth, up to 400 m below the surface. The original copper content of the deposit has been completely leached out of the current resources, however, zones of oxide copper enrichment are found deeper within the deposit, below the planned open pit. An irregular zone of supergene enrichment exists below the oxide zone, with some high grade sulphide copper intersections. It is surmised that the oxidation of the deposit has liberated the gold allowing heap leaching at a relatively coarse crush size.

The nearby Güneytepe Deposit is significantly smaller based on the drilling information collected to the end of 2014 and does not show the more straightforward zonation and continuity of alteration and gold grades as observed on the Keltepe Deposit. Silicification is intense, however, the host rocks are much less porous, and, as a result, oxidation is restricted to the upper 50 m to 75 m of this deposit.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Öksüt Project is planned as a conventional truck and shovel open pit mine. Material will be drilled and blasted, before being loaded and hauled to the waste dump, crusher, or the various ore stockpiles depending on the most profitable way to process the material. At the Öksüt Project, two pits have been planned to be mined simultaneously, the main Keltepe pit and the small satellite Güneytepe pit.

It is planned to use a mining contractor to do all mining using small excavators and 36 tonne trucks. The use of this equipment among mining contractors is common in Turkey. The mining contractor will provide and maintain all equipment, and will perform drill, blast, load, haul, and road and dump maintenance on a unit cost basis. Centerra will provide oversight of the mining operations, grade control, survey control, mine planning, and other required technical services.

The Keltepe pit will be developed in three cutbacks in order to smooth stripping requirements and mine higher grade material earlier in the mine life. Due to its small size, the Güneytepe pit will be developed in a single cutback. Lower grade material will be stockpiled throughout the Project for processing at the end of the mine life. This allows higher grade material to be processed earlier, increasing the Project net present value (NPV).


Crushing and Grinding


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The flowsheet is based on an 11,000 tpd heap leach operation. It includes primary crushing, screening and secondary crushing, heap stacking and cyanide leaching, carbon adsorption, carbon stripping and regeneration, electrowinning, and refining. The concepts and data presented in this section are taken from the Process Flowsheets and Process Design Criteria developed for the Project.

PRIMARY CRUSHING
Run-of-mine ore will be delivered by 36-tonne haul trucks to the primary crusher. The ore will be dumped on the stationary grizzly installed over the 80-tonne truck dump hopper. Oversize rocks will be handled by a rock breaker. The ore will be withdrawn from the dump hopper via a 2.0 m wide x 4.0 m long grizzly feeder. The grizzly oversize will feed the 1.6 m x 2.0 m jaw crusher that will reduce the rock size to minus 150 mm prior to being conveyed by a 1.4 m wide x 95.5 m long belt conveyor to the secondary crushing circuit, along with the grizzly feeder undersize. A sel ........

CommodityParameter
Subscription required - Subscription is required.

Production:

CommodityUnits2020LOM (Projected)
Gold koz  ......  Subscription required ^895
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.


Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1,041 kt Gold 0.68 g/t 23 koz
Probable 28,321 kt Gold 1.37 g/t 1,251 koz
Proven & Probable 29,362 kt Gold 1.35 g/t 1,274 koz
Measured 3,819 kt Gold 0.61 g/t 74 koz
Indicated 6,551 kt Gold 0.65 g/t 138 koz
Measured & Indicated 10,370 kt Gold 0.64 g/t 212 koz
Inferred 615 kt Gold 0.77 g/t 15 koz

Commodity Production Costs:

CommodityUnits2020
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2020
Capital expenditures (planned) M USD  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of June 30, 2015:
HME TypeSize
Drill 171 mm
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Technical Report 2015
Subscription required - Subscription is required.

News:

NewsDate
Centerra Gold Announces Commercial Production at Öksüt June 2, 2020
Centerra Gold Announces First Gold Pour at the Öksüt Mine January 31, 2020

Subscription required - Subscription is required.

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