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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
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Copper
Mining Method
  • Block caving
Mine Life12 years (as of Jan 1, 2016)
The Kemess Project is at an advanced stage – it has an approved environmental assessment certificate and all permits required to commence construction. There are currently no mining activities at the Kemess site and on-site activities consist of care and maintenance work.

The property is host to the former Kemess South (“KS”) Mine (operated from 1998 to 2011), the Kemess Underground (“KUG”) deposit, and the Kemess East (“KE”) deposit. The KUG project will use existing infrastructure originally used for the KS Mine which remain at site.

The Kemess Project will continue to be on care and maintenance in 2023.


Owners

Source: p. 63
CompanyInterestOwnership
Centerra Gold Inc. 100 % Indirect
Centerra’s wholly owned subsidiary (directly held), AuRico is the 100% holder of the rights to the Kemess Project.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Porphyry
  • Volcanic hosted
  • Intrusion related


Summary:

The Kemess Property is host to the Kemess South (KS), Kemess Underground (KUG) and Kemess East (KE) Deposits as well as the Kemess Offset Zone (KOZ) prospect. The Kemess Underground property is predominantly underlain by a thick (>1,000 m) succession of andesitic flows (Takla Group). The Takla volcanic rocks host a significant portion of the copper-gold mineralization and display phyllic alteration at Kemess North. On the surface is mostly a distinctive feldspar porphyritic unit (bladed feldpsar porphyry – BFP) with some sections of a distinctive augite phyric unit (augite andesite porphyry – AAP). Mantling the northern and eastern limits of the Kemess Underground area is the Hazelton Group-Toodoggone formation. The structurally controlled phyllic sections of this polylithic fragmental dacite in the southeastern area of the deposit can carry anomalous gold concentrations. The evidence suggests that basement structures and conduits that allowed extrusion of the local Toodoggone volcanic assemblage underlie the Kemess Underground area. The most prominent structure traversing the Kemess Underground area is the Kemess North (KN) Thrust Fault, an east-west trending south dipping reverse fault that truncates the Kemess North pluton and associated mineralization at depth. The KN Fault and the Kemess North pluton seem to be related with the KN Fault creating the pathway for the KUG pluton to intrude. Further movement along the KN Fault subsequently truncated the Kemess North Pluto ........


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
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

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

Operational Metrics:

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

Reserves at December 31, 2022:
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 Silver 1.99 g/t 6,878 koz
Probable 107,381 kt Copper 0.27 % 630 M lbs
Indicated 173,719 kt Gold 0.31 g/t 1,737 koz
Indicated 173,719 kt Silver 1.55 g/t 8,632 koz
Indicated 173,719 kt Copper 0.18 % 697 M lbs
Inferred 47,700 kt Gold 0.34 g/t 529 koz
Inferred 47,700 kt Silver 1.65 g/t 2,530 koz
Inferred 47,700 kt Copper 0.2 % 210 M lbs

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.

Water Supply
Source: Subscription required

- subscription is required.


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 Apr 21, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 1, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Annual Information Form 2022
Form 40-F 2022
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.

Subscription required - Subscription is required.

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