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Canada
Makwa-Mayville Project

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 Location:
138 NE from Winnipeg, Manitoba, Canada

  Project Contacts:
S18 - 24 Aberdeen Ave.
Box 670
Pinawa
Manitoba, Canada
R0E 1L0
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Copper
  • Nickel
  • Cobalt
  • Palladium
  • Gold
  • Platinum
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life14 years (as of Jan 1, 2014)
Mayville is considered a copper dominant deposit, with lesser contributions of nickel and palladium magmatic segregation. Makwa is a nickel dominant deposit with lesser contributions of copper, palladium, and cobalt.
Latest NewsGrid Provides Manitoba Project Update: Releases High Grade Lithium Drill Intercepts from the Main Dyke Pegmatite; Announces Drilling Plans for Ni-Cu-Co-PGM, Lithium and PGE Projects     September 14, 2021


Owners

Source: p. 8
CompanyInterestOwnership
Grid Metals Corp. 100 % Indirect

Deposit Type

  • Magmatic


Summary:

MAKWA
Four styles of mineralization on the Makwa Property are summarized in Ferreira et al., 1999 and some smaller mineralized showings are discussed in Juhas, 1973:
1. Magmatic nickel-copper mineralization,
2. Sulphide iron formation nickel-copper mineralization,
3. Sulphide iron formation copper mineralization,
4. Chromite mineralization.

The Makwa deposit consists of disseminated pyrrhotite, pentlandite, chalcopyrite, and pyrite in an ultramafic peridotite layer at the base of the BRS (Ferreira et al., 1999; Harper, 2004). The higher grade mineralization near the footwall contact contains approximately 15% disseminated sulphide minerals. About 12% of the sulphides contains nickel.

The Makwa deposit strikes at approximately N60°E to N70°E and dips at -60ºS to -90º. The overall average strike is approximately N68°E, however, shorter segments appear to strike at approximately N62°E. The western part of the deposit, west of section 7+00W (original grid), strikes approximately 280° at surface and the strike progressively changes down to approximately the 500 ft elevation, where the overall deposit strike becomes more linear. The deposit dips at approximately -70°S or less at the northeast and southwest extremities and dips at -80°S or steeper from approximately section 3+00W to section 8+00W (original grid). The deposit is approximately 500 m long by 10 m wide and extends to at least 500 m below surface. The deposit appears to have a moderate plunge to the southwest. Based on surface mapping and diamond drill hole interpolation, several fault offsets have been interpreted in the model.

The chromite occurs as stratigraphic layers up to about three metres thick at the transition from ultramafic to anorthositic gabbro at Makwa. In 1943, Bird River Chromite drilled nine holes totalling 894 m over approximately three kilometres of strike length and intersected grades up to 27% Cr2O3 over one metre. The chromite layers may also have potential for nickel, platinum, and palladium.

MAYVILLE
Nickel-copper sulphide mineralization at the M2 Deposit is hosted at the base of the heterolithic breccia zone, just below the structural hanging wall mafic volcanic rocks of the Lamprey Falls Formation. As noted in the Property Geology section, the sequence is overturned and, therefore, the hanging wall rocks represent the lower contact of the Mayville Intrusion.

RPA interpreted five main mineralized lenses, the Main Zone, Footwall Zone, and East Zone A, B, and C, each with a fairly consistent strike direction of N67°E and variable dips from -60ºN to -90ºN (Figure 7-6). The true thickness of mineralization ranges from slightly less than two metres to more than 100 m. The average true thickness is in the order of 20 m. Mineralization is continuous along strike, down dip, and has been traced by drilling from surface to a depth of at least 550 m. The deepest intersection is 550 m below surface.


Mining Methods

  • Truck & Shovel / Loader


Summary:

A conventional truck and shovel open pit mining method was chosen for Makwa and Mayville. Vegetation and topsoil will be cleared by dozers and graders preceding the mining operation. Suitable growth media material will be stockpiled for future reclamation use. For estimation purposes, it was assumed that a two metre thick layer of growth media is present on the Makwa and Mayville resource areas. When stripping activities are started, the actual thickness of the growth media will be determined, and the appropriate amount set aside. If any overburden needs to be stripped, then front end loaders will load off highway rigid-frame mining trucks, which will haul the overburden to the stockpile. The mineralized material and waste rock will be drilled and blasted, loaded with front end loaders and hauled with the same fleet of rigid frame mining trucks to either a crusher or waste rock pile. Ancillary activities managed by Mustang will include, but not be limited to road maintenance, road dust control, site dewatering, dump and stockpile maintenance, grade control at Makwa and Mayville, and tailings facility heavy equipment support in Mayville (as needed).


Crushing and Grinding
Flow Sheet: Source


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Based on metallurgical testwork and the prospect of mining Makwa, followed by Mayville, the Makwa Mayville concentrator is designed to process mineralized material from both projects in sequence or batching. Further testwork should be completed to determine if the Makwa and Mayville mineralized material can be blended. The concentrator location is proposed to be at the Mayville site, with associated tailings management facilities (TMF) located there. Mineralized material will be trucked from Makwa to the Mayville concentrator.

The proposed design throughput is 8,600 tpd based on 96% availability. This equates to three million tonnes mineralized material per calendar year throughput.

Makwa mineralized material will produce a single concentrate comprising mainly nickel (10% Ni) containing also copper, gold, and PGMs.

Mayville mineralized material will produce two concentrates, nickel and copper.

The concentrator will be designed to provide addi ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Head Grade, % 0.37
Nickel Head Grade, % 0.25
Cobalt Head Grade, % 0.003
Palladium Head Grade, g/t 0.18
Gold Head Grade, g/t 0.04
Platinum Head Grade, g/t 0.06

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal M lbs 274
Nickel Payable metal kt  ......  Subscription required
Cobalt Payable metal kt  ......  Subscription required
Palladium Payable metal oz  ......  Subscription required
Gold Payable metal oz  ......  Subscription required
Platinum Payable metal oz  ......  Subscription required
Copper Metal in concentrate M lbs 19
Nickel Metal in concentrate kt  ......  Subscription required
Cobalt Metal in concentrate kt  ......  Subscription required
Palladium Metal in concentrate oz  ......  Subscription required
Platinum Metal oz  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 6.34 *
Waste tonnes, LOM 247,893 kt *
Ore tonnes mined, LOM 39,073 kt *
Total tonnes mined, LOM 286,966 kt *
Daily processing capacity 8,600 t *
Daily processing rate 8,300 t *
Annual processing rate 3 Mt *
* According to 2014 study.

Reserves at April 30, 2014:

CategoryTonnage CommodityGrade
Indicated 33.8 Mt Copper 0.37 %
Indicated 33.8 Mt Nickel 0.27 %
Indicated 33.8 Mt Palladium 0.19 g/t
Indicated 33.8 Mt Platinum 0.06 g/t
Inferred 5.8 Mt Copper 0.43 %
Inferred 5.8 Mt Nickel 0.19 %
Inferred 5.8 Mt Palladium 0.15 g/t
Inferred 5.8 Mt Platinum 0.06 g/t

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Palladium CAD 889 / oz *
Assumed price Platinum CAD 2,000 / oz *
Assumed price Cobalt CAD 15.6 / lb *
Assumed price Nickel CAD 9.44 / lb *
Assumed price Copper CAD 3.78 / lb *
Assumed price Gold CAD 1,833 / oz *
* According to 2014 study / presentation.

Operating Costs:

Units2014
Total operating costs ($/t milled) CAD 10.5 *
* According to 2014 study.

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
Total OpEx $M CAD  ......  Subscription required
Royalty payments $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Net revenue (LOM) $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 @ 10% $M CAD  ......  Subscription required
Pre-tax NPV @ 7.5% $M CAD  ......  Subscription required
After-tax NPV @ 0% $M CAD  ......  Subscription required
After-tax NPV @ 10% $M CAD  ......  Subscription required
After-tax NPV @ 7.5% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of April 30, 2014:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Preliminary Economic Assessment 2014
Subscription required - Subscription is required.

News:

NewsDate
Grid Provides Manitoba Project Update: Releases High Grade Lithium Drill Intercepts from the Main Dyke Pegmatite; Announces Drilling Plans for Ni-Cu-Co-PGM, Lithium and PGE Projects September 14, 2021

Aerial view:

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