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Premier gold project, Canada – update

23rd October 2020

By: Sheila Barradas

Creamer Media Research Coordinator & Senior Deputy Editor

     

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Name of the Project
Premier gold project (PGP).

Location
The project is located in British Columbia, Canada, adjacent to the border with Alaska, in the US, in the Golden Triangle gold mining district.

Project Owner/s
Ascot Gold.

Project Description
An independent feasibility study has outlined a low capital restart plan for the PGP, based on a proven and probable reserve of 6.2-million tonnes grading 5.9 g/t gold and 19.7 g/t gold.

The study is based on four underground mining operations – Silver Coin, Big Missouri, Premier and Red Mountain – feeding a centralised 2 500 t/d processing facility at PGP. The mining operations will be sequenced over eight years to initially produce 1.1-million ounces of gold and three-million ounces of silver.

Mining will start from the Silver Coin and Big Missouri deposits, which will be followed by the Red Mountain deposit in Year 3 and then the Premier deposit.

In the four planned operations, access for production will be through new and existing adits (side hill portal access) using a combination of new ramp development and the refurbishment of existing underground infrastructure.

Mining methods will largely comprise low-cost longhole stoping for most of the ore, with limited use of inclined undercut longhole, room-and-pillar and cut-and-fill mining methods in specific shallow or flat-lying stopes. Ore will be trucked to the processing facility and mining waste will be used underground as a combination of rockfill and cemented rockfill.

The existing processing facility will be refurbished within a construction period of about 40 weeks. The process plant will use conventional crushing, grinding and gravity circuits followed by a stan­dard carbon-in-leach process to produce a gold doré.

The plant refurbishment will comprise a com­bi­na­tion of existing, new and repaired equipment and supporting plant infrastructure. Prior to ore from the Red Mountain project being treated, the plant will add an energy efficient fine grinding mill and an additional preleach thickener to accommodate the processing of the harder ore feed and the finer grind required for recovery purposes.

PGP has an existing tailings storage facility and water treatment plant. The independent feasi­bility study has two key enhancements to the exist­ing infrastructure:

• the tailings dam will be raised using centreline lifts throughout the mine life, with about 1.2-million cubic metres of nonacid-generating rock excavated from a nearby quarry; and

• the water treatment plant will be modified to nearly double the existing capacity to accom­modate additional water treatment from the Big Missouri and Silver Coin operations, and will also include an ammonia treatment plant, a water clarifier and lime high-density sludge system.

Potential Job Creation
Not stated.

Net Present Value/Internal Rate of Return
The project has a base case net present value, at a 5% discount rate, of $516-million and an internal rate of return of 62%.

Capital Expenditure
The project has an initial capital expenditure of $146.6-million, including a 9% contingency, and 22% indirect costs.

Planned Start/End Date
Not stated.

Latest Developments
Ascot Resources has signed an agreement with Montreal-based Farnell-Thompson Applied Technologies for delivery of the semiautogenous grinding (SAG) mill, ball mill and related parts to the Premier mill site.

The order comprises a 22-ft-diameter x 8 ft effective grinding length SAG mill and a 14.5-ft-diameter x 19.5 ft effective grinding length ball mill. Both mills will be driven by 2 000 kW, low-speed synchronous motors at 78% critical speed. The mills will be supported on 90-inch-diameter hydrodynamic trunnion bearings, which will be interchangeable. The mill lube systems will be identical for both mills.

Key Contracts, Suppliers and Consultants
Sacre-Davey Engineering (overall coordination, infrastructure and the economic evaluation in the independent feasibility study); InnovExplo Inc and Mine Paste (mining); Sedgman Canada (metallurgy and processing); Knight Piésold (tailings and water management); SRK Consulting (water treatment plant); Paul Hughes Consulting (site geotechnical); McElhanney (access roads); Prime Engineering (electrical substation); Palmer Environmental Consulting Group (geochemistry, hydrology and water quality modelling); Falkirk Environmental Consultants and EcoLogic Consultants (environmental studies); and Farnell-Thompson Applied Technologies SAG ball mills and related parts).

Contact Details for Project Information
Ascot Resources, tel +1778725 1060 or email info@ascotgold.com.

 

Edited by Creamer Media Reporter

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