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Canada
Kemess UG Project

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 Location:
252 km N from Smithers, British Columbia, Canada

  Project Contacts:
299 Victoria St Suite 200
Prince George
British Columbia, Canada
V2L 5R8
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WebsiteWeb
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Block caving
Mine Life12 years (as of Jan 1, 2017)
There are currently no mining activities at the Kemess site and on-site activities consist of care and maintenance work and pre-development activities for the proposed Kemess Underground Project.


Owners

Source: p. 10
CompanyInterestOwnership
Centerra Gold Inc. 100 % Indirect

Contractors

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Deposit Type

  • Porphyry
  • Volcanic hosted
  • Intrusion related


Summary:

The Kemess Underground deposit is a large copper-gold porphyry deposit and is typical of calc-alkaline porphyry copper-gold deposits in the western cordillera. The deposit has a low grade ore zone at a depth of 150 metres below the surface on its western flank and a higher grade zone 300–550 metres below surface on the eastern side, which forms the Kemess Underground Project. The Kemess Underground deposit is hosted by potassic altered Takla Group volcanic rocks and Black Lake plutonic rocks. The deposit is centered on a mineralized porphyritic monzodiorite/diorite pluton and associated WSW trending dykes, which extend to the southwest. Higher-grade copper-gold mineralization is characterized by secondary biotite alteration in volcanic and the eastern plutonic host rocks.

Porphyry style copper-gold mineralization occurs within the Takla volcanic rocks and intermediate intrusive rocks associated with weak to pervasive propyllitic, phyllic, and potassic (biotitic) alteration assemblages. The latter is associated with better copper and gold grades. Alteration of Toodoggone assemblages ranges from fresh to weak propyllitic and is generally barren of significant sulphides and ore grade mineralization.

Gold-copper mineralization forms an inclined tabular zone that is centred on the East Cirque porphyritic monzodiorite, which from structural contours, strikes east-west and dips 20° to the south. The quartz diorite/quartz monzonite intrusive exhibits an irregul ........


Mining Methods

  • Block caving


Summary:

The opportunity to exploit the Kemess Underground (KUG) gold-copper-silver deposit by underground mining methods such as longhole open stoping, sub-level caving, and block cave mining methods, with the block cave approach recommended due to superior economics. As a result, AuRico (then Northgate Minerals) elected to conduct a Feasibility Study (FS) for the Kemess Underground (KUG) deposit based on block caving.

The planned production schedule calls for 107.3 Mt of ore mined at a head grade of 0.27% Cu and 0.54 g/t Au and 1.99 g/t Ag.

Triple declines will be developed from surface comprising access, intake air, and conveyor declines. The access decline will provide access for personnel, equipment, and materials/consumables.

The final design establishes a single extraction level at the 1140 mRL (Figure 5.3) that includes 582 drawpoints (291 drawbells) over a footprint that is approximately 570 m eastwest and 90 m to 300 m north-south. The cave will be initiated in the highest grade ore in the east of the orebody and progress to the southwest over the life of the mine. An 18 m high undercut will be established above the undercut level, with this level at the 1158 mRL and accessed via ramps from the extraction level.

Ore will be recovered on the extraction level using 8.6 m³ (17 t) load-haul-dump (LHD) machines and dumped into one of four 55” x 42” jaw crushers located to the south of the footprint. Transfer conveyors will then transpo ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Metal in ore koz 1,868
Copper Metal in ore M lbs  ......  Subscription required
Silver Metal in ore oz  ......  Subscription required
Gold Metal koz 106
Copper Metal M lbs  ......  Subscription required

Operational Metrics:

Metrics
Waste tonnes, LOM 2,975,734 t *
Ore tonnes mined, LOM 107,381,498 t *
Total tonnes mined, LOM 110,357,232 t *
Daily processing capacity 35,000 t *
Annual processing capacity 12.7 Mt *
* According to 2016 study.

Reserves at December 31, 2021:
The mineral reserves are estimated based on an NSR cut-off of C$17.30 per tonne and takes into consideration metallurgical recoveries, concentrate grades, transportation costs and smelter treatment charges in determining economic viability.
The mineral resources are estimated based on an NSR cut-off of C$15.00 per tonne and takes into consideration metallurgical recoveries, concentrate grades, transportation costs and smelter treatment charges.

CategoryTonnage CommodityGradeContained Metal
Probable 107,381 kt Gold 0.5 g/t 1,868 koz
Probable 107,381 kt Copper 0.27 % 630 M lbs
Probable 107,381 kt Silver 1.99 g/t 6,878 koz
Indicated 173,719 kt Gold 0.31 g/t 1,737 koz
Indicated 173,719 kt Copper 0.18 % 697 M lbs
Indicated 173,719 kt Silver 1.55 g/t 8,632 koz
Inferred 47,700 koz Gold 0.34 g/t 529 koz
Inferred 47,700 koz Copper 0.2 % 210 M lbs
Inferred 47,700 koz Silver 1.65 g/t 2,530 koz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Copper Equivalent USD 1.38 / lb *  
Total cash costs Gold Equivalent USD 663.3 / oz *  
All-in sustaining costs (AISC) Copper Equivalent USD 1.55 / lb *  
All-in sustaining costs (AISC) Gold Equivalent USD 742.1 / oz *  
All-in sustaining costs (AISC) Gold USD 244 / oz *†  
Assumed price Copper USD 2.5 / lb *  
Assumed price Silver USD 16 / oz *  
Assumed price Gold USD 1,200 / oz *  
* According to 2016 study / presentation.
† Net of By-Product.

Operating Costs:

Units2016
UG mining costs ($/t milled) CAD 5.54 *
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 612.8
Site services costs $M CAD 131.4
G&A costs $M CAD 357.8
Total OpEx $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Pipelines
TypeMaterialDiameterLengthDescription


Proposed Heavy Mobile Equipment as of February 29, 2016:
HME TypeModelSizeQuantityLeased or
Contractor
ANFO Loader ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Environmental Assessment 2018
Feasibility Study Report 2017
Feasibility Study Report 2016
Annual Information Form 2015
Subscription required - Subscription is required.

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