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Canada
Gahcho Kué Mine

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 Location:
284 km NE from Yellowknife, Northwest Territories, Canada

  Regional Office:
300 - 5120 49th Street
Yellowknife
Northwest Territories, Canada
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Diamond
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2030
Gahcho Kué is an open pit operation, mining three kimberlite pipes in sequence: 5034, Hearne and Tuzo.


Owners

Source: p. 5
CompanyInterestOwnership
Anglo American plc. 43.4 % Indirect
Mountain Province Diamonds Inc. 49 % Indirect
De Beers Canada Inc. (operator) 51 % Indirect
Mountain Province Diamonds Inc, through its wholly owned subsidiaries 2435572 Ontario Inc. and 2435386 Ontario Inc., holds a 49% interest in the Gahcho Kué diamond mine, located in the Northwest Territories of Canada. De Beers Canada Inc. (“De Beers” or the “Operator”) holds the remaining 51%.

Anglo American owns 85% of De Beers.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Kimberlite


Summary:

The main Gahcho Kué kimberlite cluster comprises four kimberlite bodies: Hearne, 5034, Tuzo, and Tesla. Hearne, most of the 5034 Pipe, and the Tuzo and Tesla occur under Kennady Lake, which has an average depth of 8 m. The Tesla kimberlite body is not part of the current declared resources or reserves.

Gahcho Kué kimberlites are overlain by varying thickness of glacial boulder outwash and lake sediments (averaging 10 m thick), and have a combined water and sediment cover as much as 25 m thick.

Drill information suggests that Tuzo and 5034 are located on an inclined feeder dyke system, the GK dyke, which dips roughly 25 degrees NNE. A vertical feeder dyke, as it is common for most maar-diatreme volcanoes, was not identified. Hearne is located on another feeder dyke system which dips to the North. The feeder dyke systems were repeatedly active during emplacement, resulting in a complex facies architecture of the kimberlite bodies rising from the feeder dykes.

The kimberlite bodies are steep-sided comprising of several texturally distinct phases of kimberlite in which the textures vary from hypabyssal kimberlite (HK) to diatreme facies tuffisitic kimberlite (TK). TK displays many diagnostic features including abundant unaltered country rock xenoliths, pelletal lapilli, serpentinized olivine and a matrix composed of microlitic phlogopite and serpentine without carbonate. HK contains common fresh olivine set in a groundmass composed of monticell ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Gahcho Kué Mine employs conventional open pit truck/shovel mining methods. Waste and ore are blasted and loaded using a fleet of diesel-powered trucks, shovels, drills and ancillary equipment. Waste rock will be stored in two surface mine rock piles as well as in two of the excavated pits at later stages of the mine life. Kimberlite ore is hauled to a run-of-mine storage pad where the ore is stockpiled and loaded into the primary crusher via a front-end loader. Kimberlite processing creates two additional waste streams of coarse and fine processed kimberlite. Coarse processed kimberlite (CPK) is loaded into haul trucks and stacked in a pile north of the plant, while the fine processed kimberlite (FPK) is deposited via slurry into a settlement pond known as Area 2. Non-acid generating (NAG) and potentiallyacid generating (PAG) waste rock is differentiated using an on-site sampling system of blast hole cuttings. PAG rock is encapsulated within the surface mine rock piles and eventually below the restored final lake elevation of Kennady Lake during period of pit backfill.

The mine design and consequent mine plan considers conventional truck / shovel mining utilizing 29 m3 bucket diesel hydraulic front shovels, a 17 m3 front-end loader and 218 t class haul trucks to mine kimberlite and waste. This large fleet is augmented by 12 m3 bucket front-end loaders, scaling excavators and five 90 t haul trucks. Production drill and blast activities are supported by a fleet ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityUnits2023202220212020201920182017
Diamond k carats  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required6,9375,934
All production numbers are expressed as mineral. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required43,225 kt41,444 kt36,513 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,247 kt2,908 kt3,513 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required3,581 kt3,194 kt2,775 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required39,978 kt38,536 kt33,000 kt
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required9,811 t8,751 t7,603 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Reserves at December 31, 2022:
Mineral Reserves are reported at a bottom cut-off of 1.1 mm
Mineral Resources are reported at a bottom cut-off of 1.0 mm. Incidental diamonds are not incorporated in grade calculations.

CategoryOreTypeTonnage CommodityGradeContained carats
Probable Stockpiles 1.98 Mt Diamond 1.63 carats/t 3.22 M carats
Probable In-Situ (OP) 24 Mt Diamond 1.45 carats/t 34.7 M carats
Probable Total 26 Mt Diamond 1.46 carats/t 38 M carats
Indicated In-Situ (OP) 2.5 Mt Diamond 1.4 carats/t 3.5 M carats
Inferred In-Situ (OP) 13.5 Mt Diamond 1.75 carats/t 23.6 M carats

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs Diamond CAD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 47 / carat   33 / carat  
^ Guidance / Forecast.
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Operating Costs:

Units202220212020201920182017
Total operating costs ($/t milled) CAD 12211010310310173

Financials:

Units20232022202120202019
Capital expenditures (planned) M CAD  ......  Subscription required
Revenue M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Income M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Drill ....................... Subscription required 251 mm ....................... Subscription required
Drill ....................... Subscription required 171 mm ....................... Subscription required
Loader (FEL) ....................... Subscription required 17 cu. m ....................... Subscription required
Loader (FEL) 12 cu. m
Shovel ....................... Subscription required 29 cu. m ....................... Subscription required
Truck (haul) ....................... Subscription required 218 t ....................... Subscription required
Truck (haul) 90 t
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
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....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Financial Review 2022
Integrated Report 2022
Management Discussion & Analysis 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Technical Report 2018
Management Discussion & Analysis 2017
Press Release 2017
Year-end Mineral Reserves 2016
Feasibility Study Report 2014
Subscription required - Subscription is required.

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