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Canada
Macmillan Pass Project

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 Location:
177 km NE from Ross River, Yukon, Canada

  Project Contacts:
Suite 1020, 800 Pender Street
Vancouver
British Columbia, Canada
V6C 2V6
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit & Underground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Alimak
  • Longhole stoping
  • Transverse stoping
  • Sub-level Retreat
  • Vertical Crater Retreat
  • Cemented backfill
Mine Life18 years (as of Jan 1, 2018)
Macmillan Pass is one of the largest undeveloped Zinc deposits in the world.
Latest NewsFireweed Drills 12.5 m of 11.17% Zinc including 6.2 m of 15.84% Zinc at Boundary Main     January 31, 2023


Owners

Source: p. 2
CompanyInterestOwnership
Fireweed Metals Corp. 100 % Direct

Contractors

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Deposit Type

  • SEDEX


Summary:

The Tom and Jason deposits are examples of stratiform, strata-bound sediment-hosted, exhalative (“SEDEX”) zinc-lead-silver-barite deposits (Goodfellow et al., 1993; Leach et al., 2005; Goodfellow et al., 2007; Goodfellow, 2007).

Zinc-lead-silver-barite mineralisation at the Tom deposit varies from well laminated and stratiform (parallel to sedimentary layering) to a brecciated stockwork zone adjacent to the Tom normal fault. The Tom West and Tom East zones, both of which are exposed at surface, are interpreted to have formed one continuous strata-bound controlled lens prior to folding and faulting of the Tom Sequence, whereas the Southeast Zone is interpreted to have formed in a separate sub-basin to the main graben structure hosting the Tom West and Tom East zones (Goodfellow, 1991). All three zones have been affected by folding, with evidence for the possible development of a crenulation cleavage as opposed to the chaotic folding of laminae due to soft-sediment deformation. Ferroan carbonate alteration and quartz veining are common in footwall conglomerates near vent facies at Tom West.

The Tom West Zone dips 60° to the southwest, has a strike extent of approximately 1 km and extends up to 400 m down dip. It is about 40 m thick at its widest point and breaks into two discrete layers in the centre at depth. Contacts vary from transition over <1 m or are faulted and abrupt. The highest-grade portion of the Tom West Zone occurs along the southern and nea ........


Mining Methods

  • Truck & Shovel / Loader
  • Alimak
  • Longhole stoping
  • Transverse stoping
  • Sub-level Retreat
  • Vertical Crater Retreat
  • Cemented backfill


Summary:

Given the outcropping nature and deep vertical extension of both Tom and Jason deposits, several zones were reviewed for both open pit and underground potential.

Initial material will be recovered at a rate of about 5,000 tonnes per day by conventional truck and shovel surface mining from both the Tom and Jason deposits. During the third year, production will transition to underground mining. Stopes will be filled with a combination of waste rock and paste and cemented rock fill.

Open pit mining accounts for 13% or 4.2M tonnes of the total 32.7M tonnes of material mined and processed. VCR and LH methods account for 75% of the material mined and processed by underground methods.

Mining recovery and dilution factors were applied by mining method. Average open pit mining recovery and dilution were 95% and 10% respectively. Average underground mining recovery and dilution were 92% and 21% respectively.

Existing surface roads and underground development will be rehabilitated and utilized as part of the mine plan. Mine access portals at multiple elevations are planned to maximize natural ventilation and dewatering of underground operations. Open pits have been designed to maintain safe working distance from all major water ways.

Diesel powered mobile equipment would be used to conduct all open pit and underground mining activities. Underground crushing and conveying would provide low cost mineral transport from the Tom deposit, ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Zinc Metal in concentrate M lbs 1873,395
Zinc Concentrate kt 1472,638
Zinc Payable metal M lbs 1592,887
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate 4,900 t *
Stripping / waste ratio 5 *
Daily milling capacity 5,000 t *
Daily ore mining rate 4,900 t *
Waste tonnes, LOM 24,680 kt *
Ore tonnes mined, LOM 32,656 kt *
Total tonnes mined, LOM 53,590 kt *
Tonnes milled, LOM 32,656 kt *
* According to 2018 study.

Reserves at January 10, 2018:
The Mineral Resource has been reported above an NSR cut-off grade of C$65 and has an effective date of 10 January 2018.

CategoryTonnage CommodityGradeContained Metal
Indicated 11,207,000 t Zinc 6.59 % 1.63 B lbs
Indicated 11,207,000 t Lead 2.48 % 0.61 B lbs
Indicated 11,207,000 t Silver 21.33 g/t 7.69 M oz
Indicated 11,207,000 t Zinc Equivalent 9.61 %
Inferred 39,465,000 t Zinc 5.84 % 5.08 B lbs
Inferred 39,465,000 t Lead 3.14 % 2.73 B lbs
Inferred 39,465,000 t Silver 38.15 g/t 48.41 M oz
Inferred 39,465,000 t Zinc Equivalent 10 %

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Lead USD 0.98 / lb *  
Pre-tax break-even price Zinc USD 0.8 / lb *  
Assumed price Zinc USD 1.21 / lb *  
Assumed price Silver USD 16.8 / oz *  
* According to 2018 study / presentation.

Operating Costs:

Units2018
OP mining costs ($/t mined) CAD 4.45 *
UG mining costs ($/t mined) CAD  ......  Subscription required
OP mining costs ($/t milled) CAD  ......  Subscription required
UG mining costs ($/t milled) CAD  ......  Subscription required
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2018 study.
Subscription required - Subscription is required.

2018 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
OP OpEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 748.5
G&A costs $M CAD 338.6
Total OpEx $M CAD  ......  Subscription required
Mining Taxes $M CAD  ......  Subscription required
Income Taxes $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 0% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 0% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Water Supply

Fresh water will be supplied from nearby streams and/or the underground mines. The water will be stored in the firewater tank with the top portion flowing by gravity into the plant for gland services, reagent mixing and spray water.

The source of process water will be reclaimed tailings pond water and concentrate thickener overflows. This will be used as make-up water throughout the plant.

Water samples will be tested to Yukon Water Board requirements prior to discharge into the surrounding streams. Two main tests will be performed, water quality and acid rock drainage (ARD) potential. Water samples will be analyzed for sulphates, ammonia, nitrates, nitrites, cyanide, thiocyanide, pH, and hardness.

One sample will be collected for ADR testing bi-weekly. Samples will also be prepared to be sent for analysis by third party laboratories that meet regulatory standards.


Proposed Heavy Mobile Equipment as of August 6, 2018:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Dec 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2022
....................... Subscription required ....................... Subscription required Subscription required May 23, 2018
....................... Subscription required ....................... Subscription required Subscription required May 23, 2018
....................... Subscription required ....................... Subscription required Subscription required Dec 15, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Press Release 2022
Corporate Presentation 2018
Preliminary Economic Assessment 2018
Press Release 2018
Technical Report 2018
Subscription required - Subscription is required.

News:

NewsDate
Fireweed Drills 12.5 m of 11.17% Zinc including 6.2 m of 15.84% Zinc at Boundary Main January 31, 2023

Subscription required - Subscription is required.

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