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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
  • Sub-level Retreat
  • Vertical Crater Retreat
  • Cemented backfill
Processing
  • Flotation
Mine Life18 years (as of Jan 1, 2018)
Latest NewsFireweed Intersects 4.76% Zinc, 0.43% Lead and 18.9 g/t Silver over 43.7 m in upper sequence and 2.08% Zinc over 225 m in lower sequence at Boundary West     February 25, 2021


Owners

 
CompanyInterestOwnership
Fireweed Zinc Ltd. 100 % Direct

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 near surface portion of the zone where Pb+Zn grades exceed 10% with elevated silver. The Tom West Zone hosts the bulk of the resource at the Tom deposit.

The Tom West Zone can be divided into a series of mineralization facies (after Goodfellow, 1991; 2007) consisting of:
• Vent facies – Stockwork of pyrite, pyrrhotite, galena, sphalerite, with minor chalcopyrite, arsenopyrite and tetrahedrite with a gangue of ferroan carbonates, quartz and barite subdivided into five types, including an upper high-grade zone with 15–30% Pb+Zn, Ag between 150 g/t and 200 g/t and a low Zn/(Zn+Pb) ratio.
• Pink facies – Interbedded barite, chert, cream-coloured sphalerite, fine grained pyrite and black Bacarbonate, overprinted by pink and yellow sphalerite resulting in locally high grades in the range of 10–30% combined Pb and Zn.
• Gray facies – Interbedded pink sphalerite, fine grained galena and pyrite, white to pale gray barite, pale grey chert and grey to white Ba-carbonate/Ba-feldspar, typically with grades in the range of 4–5% Pb+Zn with negligible Ag.
• Black facies – Black mudstone and chert interbedded with barite, witherite (Ba-carbonate) and finegrained sphalerite, galena and pyrite, typically with grades in the 4–10% Pb+Zn range and a high Zn/(Pb+Zn) ratio.

The Tom East Zone occurs near the hinge of the anticline that has folded the originally planar deposit, and which plunges northward in this area. It consists of interbedded high-grade sphalerite, galena, barite and chert thought to have formed within the same stratigraphic interval as Tom West (McClay and Bidwell, 1986).

The Tom Southeast Zone is not exposed at surface, and consists of a tabular, stratiform body 0.5 m to 6 m thick with a strike length of approximately 400 m and a down-dip extension of at least 350 m dipping 60–70° to the east. It is located near the nose of the southeast-plunging Tom anticline on its eastern limb. Mineralisation consists of finely laminated sphalerite, galena, pyrite and black cherty mudstone (Goodfellow, 1991).

The Jason Main Zone is located on the northern limb of the east-plunging Jason syncline, while the Jason South Zone occurs on the southern limb. The South Zone consists of two separate horizons whereas the Main zone is defined by a single horizon. These two separate zones are likely connected through the hinge of a syncline, but this has yet to be demonstrated through drilling. These horizons can be divided into several distinct mineralisation facies (zones), including (after Turner, 1991):
• Pb-Zn-Fe sulphide facies – Massive, banded sphalerite-galena and galena-pyrite overlain by debris flow deposits containing clasts of earlier deposited massive sulphides.
• Barite-sulphide facies – Interbedded fine-grained sphalerite, galena, barite, chert and ferroan carbonate forming the bulk of the mineralisation at Jason.
• Quartz-sulphide facies – Interbedded sphalerite, pyrite, quartz and carbonaceous chert with quartzcelsian (barium feldspar) bands in the lower lens.
• Massive pyrite facies – Massive pyrite beds interbedded with sphalerite, galena, chalcopyrite, pyrrhotite and quartz located near the Jason Fault.
• Ferroan carbonate facies – Massive beds of siderite and ankerite up to several metres across with irregularly distributed galena, sphalerite, pyrrhotite, pyrite, quartz, muscovite and pyrobitumen; spatially associated with a breccia pipe.


Mining Methods

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


Summary:

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 using Avoca-style sub-level retreat longhole (LH) stoping, vertical crater retreat (VCR) and alimak stoping. 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, while the Jason mine being further from the mill site would utilize truck transport.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 42" x 48" 160 kW 1
Jaw crusher 25" x 40" 90 kW 1
SAG mill 6.4m x 3.7m 1865 kW 1
Ball mill 5.5m x 9.3m 4476 kW 1

Summary:

Crushing
Two crushing circuits will operate to process the mined material from the Tom and Jason deposits. The crushing plants for Tom will be located underground and will include a 42” x 48” jaw crusher with an installed power of 160 kW. Jason material will be stockpiled near the above ground jaw crusher or direct dumped through an 800 mm static grizzly into a dump pocket. Stockpiled ROM material will be re-handled by a front-end loader and fed into the crusher. The material will discharge through the static grizzly into a feed hopper. Oversize material from the static grizzly will be removed for later size reduction using a rock breaker. The Jason jaw crusher 636 mm x 1,016 mm (25” x 40”) with an installed power of 90 kW, will process 150 t/h. The crusher, with a closed side setting (CSS) of 125 mm, will produce a final product P80 of approximately 110 mm.

Product from the two crushers will be conveyed to the 5,000 tonne or 24 hour live crushed material stockpile.Two belt feeders, located in a corrugated tunnel under the stockpile, will be installed with variable frequency drives (VFD) to control the reclaim rate feeding the grinding circuit. Each belt feeder will be capable of providing the total throughput of 226 t/h.

Grinding
The grinding circuit will consist of a primary SAG mill followed by a secondary ball mill. The primary SAG mill will operate in open circuit, while the secondary ball mill will operate in reverse closed circuit with a cluster of hydrocyclones. The grinding circuit will be able to process a nominal throughput of 226 t/h (fresh feed), and produce a final product P80 of 50 µm.

Product from the crushing circuits will be conveyed to a 6.4 m diameter by 3.7 m long SAG mill with an installed power of 1,865 kW motor. A belt-scale on the feed conveyor will monitor feed rate. Water will be added to the SAG mill to maintain the slurry charge in the mill at a constant density of 70%. Slurry will overflow from the SAG mill onto a screen. The screen oversize will discharge onto a series of three recycle conveyors and returned to the feed end of SAG mill. The screen undersize at a transfer size (T80) of approximately 1,000 µm will flow into the cyclone feed pump box.

Product from the primary SAG mill screen undersize will flow into the cyclone feed pump box and combine with the secondary ball mill discharge before being pumped up to a cluster of ten (eight operating / two standby) 375 mm hydrocyclones for size classification. The coarse underflow will flow by gravity to the secondary ball mill, 5.5 m diameter by 9.3 m long ball mill with an installed power of 4,476 kW, for additional grinding. The fine cyclone overflow, at a final product P80 of 50 µm, will report to the Pb Conditioning Tank. The hydrocyclones have been designed for a 300% circulating load.


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Lead Circuit
Cyclone overflow will flow by gravity to a 19 m3 Pb conditioning tank, which will provide 2 minutes of conditioning time prior to Pb flotation. Frother methyl isobutyl carbinol (MIBC), sulphide collector sodium xanthate (PAX), Zn depressant sodium cyanide (NaCN), pH modifier soda ash, zinc sulphate (ZnSO4) and carbon depressant PE26 will be added to the conditioning tank. The slurry will then gravitate to the rougher flotation circuit, which consists of six 20 m3 flotation tanks cells operating in series.

The Pb rougher concentrate from cells 1 and 2 will be pumped to a 1.5 m diameter x 8.0 m high flotation column. The column concentrate will report to the Pb concentrate thickener for dewatering, while the tailings will be pumped to the Pb regrind circuit.

Pb rougher concentrate from cells 3 through 6 will be collected in a common launder and pumped to the regrind circuit. The rougher concentrate and column tailings will be pumped to a cluster o ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Zinc Recovery Rate, % 89
Zinc Head Grade, % 7.3
Zinc Concentrate Grade, % 58.4
Lead Recovery Rate, % 75
Lead Head Grade, % 3.2
Lead Concentrate Grade, % 61.5
Silver Recovery Rate, % 59
Silver Head Grade, g/t 44

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 M oz  ......  Subscription required
Silver Metal in concentrate M oz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Daily mining capacity  ......  Subscription required
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
* According to 2018 study.
Subscription required - Subscription is required.

Reserves at January 10, 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
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/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
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.

Proposed Heavy Mobile Equipment as of August 6, 2018:
HME TypeModelSizeQuantity
Backhoe 1
....................... Subscription required 3
....................... Subscription required 4
....................... Subscription required 4
....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 10
....................... Subscription required ....................... Subscription required 10
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 30, 2020
....................... Subscription required ....................... Subscription required Subscription required May 23, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2018

Corporate Filings & Presentations:

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

News:

NewsDate
Fireweed Intersects 4.76% Zinc, 0.43% Lead and 18.9 g/t Silver over 43.7 m in upper sequence and 2.08% Zinc over 225 m in lower sequence at Boundary West February 25, 2021
Fireweed Intersects 4.22% Zinc and 25.6 g/t Silver over 76.5 m Including 6.46% Zinc and 47.5 g/t Silver over 24.1 m in First Hole at Boundary West February 3, 2021
Fireweed Intersects 4.42% Zinc over 212.70 m Including 25.58% Zinc over 5.81 m at Boundary Zone January 26, 2021
Fireweed Zinc Closes $2.065 Million Private Placement September 4, 2020
Fireweed Zinc Announces $2.0 Million Private Placement August 26, 2020
Fireweed Zinc Closes $5.2 Million Private Placement August 6, 2020
Fireweed Announces Increase to Previously Announced Offering to $4.9 Million Due to Strong Investor Interest July 20, 2020
Fireweed Zinc Announces Drill Program at Boundary Zone and $3.5 Million Private Placement July 15, 2020
Fireweed Closes $1.1 Million Private Placement April 14, 2020
Fireweed Zinc Announces Private Placement March 31, 2020
Fireweed Zinc Upsizes Private Placement March 31, 2020
Fireweed Zinc Receives Upgraded Permit for Macmillan Pass November 18, 2019
Fireweed Drills 100 m of 7.94% Zinc from Surface at Boundary including 6.4 m of 42.49% Zinc Within 230 m of 4.14% Zinc November 5, 2019
Fireweed Drills 250 m True Width of 3.44% Zinc from Surface at Boundary Including Intersections of 23.31m of 16.35% Zinc and 11.85m of 13.63% Zinc+Lead October 16, 2019
Fireweed Drills Wide Zones at Tom East and Tom North September 10, 2019
Fireweed Drills New Zone at the Macmillan Pass Project Including 22.5 metres of 6.13% Zinc and 0.95% Lead August 20, 2019
Fireweed Zinc Announces Positive Preliminary Economic Assessment with Pre-Tax IRR of 32% and NPV (8%) of C$779M on Macmillan Pass Project Zinc Yukon PEAs & Feasibility Study May 23, 2018

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