Makwa-Mayville Project

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Mine TypeOpen Pit
StagePreliminary Economic Assessment
  • Copper
  • Nickel
  • Cobalt
  • Palladium
  • Gold
  • Platinum
Mining Method
  • Truck & Shovel / Loader
Mine Life... Lock
SnapshotMayville 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.


Grid Metals Corp. 100 % Indirect
The Makwa Mayville Ni-Cu-PGM-Co property is located 145 kilometers northeast of Winnipeg Manitoba. The property consists of several blocks of mining claims and a mineral lease. The Company owns 100% of the mineral rights of the property subject to a NSR and a minority interest in part of the Mayville block of claims.



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Deposit type

  • Magmatic
  • Iron formation hosted


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.

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. 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.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



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CommodityProductUnitsAvg. AnnualLOM
Nickel Payable metal kt 47
Cobalt Payable metal kt 0.2
Palladium Payable metal oz 124,122
Gold Payable metal oz 21,628
Platinum Payable metal oz 19,659
Copper Metal in concentrate M lbs 19
Nickel Metal in concentrate kt 3.6
Cobalt Metal in concentrate kt 0.013
Palladium Metal in concentrate oz 9,300

Production Costs

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

Operating Costs

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

Project Costs

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Heavy Mobile Equipment


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Mine Management

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Total WorkforceYear
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