- Mishi Geology
- Mishi Exploration
- Reserves and Resources
The Mishi Mine is an open pit mining operation that has been intermittently producing since 2002. Production recommenced in 2012 at a rate of 200 tonnes per day and has since expanded to approximately 400 tonnes per day. Recent investments in milling operations have enabled continuous and increasing production since 2013. This mine will be expanded to 900 tonnes per day over the next couple of years.
Modest surface drilling programs to date have handily increased Mineral Reserves, net of depletion, year over year. Reserves are drilled to a depth of 70 metres and Resources to 110 metres. The mineralized system is completely open to the west and at depth.
At the Mishi Mine, Mineral Reserves have consistently increased, net of depletion, over the last 3 years. The life of mine stripping ratio has decreased to 2.5 tonnes of waste rock per tonne of ore. The currently planned pit bottom is to a depth of 70 metres. Indicated open pit Mineral Resources to a depth of 110 metres are double the existing Mineral Reserves base at like grade. Given the existing modest stripping ratio and conservative pit wall slope angles, it is reasonable to assume geotechnical studies planned in 2016 will provide justification to eventually layback the highwall, deepen the ultimate pit limits and transform a portion of Mineral Resources into Mineral Reserves. Exploration drilling in 2016 is providing a preliminary pass to investigate potential of the mineralized system to extend an additional 3.0 kilometres westwards.
In 2016, Wesdome has launched an exploration drilling program to trace the mineralization to the west and at depth.
Mineralization is hosted in the Mishibishu Deformation Zone which traverses the property over a 14 kilometre length and is interpreted as a major regional thrust fault which follows a volcanic-sedimentary contact. The northern portion of the property is underlain by mafic volcanic rocks and subvolcanic gabbroic sills. These are overlain to the south by shallow water immature arenaceous/arkosic sediments and polymictic conglomerates, followed by deeper water silts and turbidites progressing southward.
The sequence is overturned dipping moderately north, facing south and striking 90-120º. The deformation zone is 0.5 to 1.0 kilometre wide and characterized by strong ankerite alteration and a schistose fabric dominated by phyllosilicate minerals, sericite and chlorite. Because of the intense deformation, systematic recognition of protoliths and subunits within the deformation zone is problematic.
In the Mishi Mine area mineralization is hosted by a series of at least 8 tabular parallel zones consisting of ankerite-sericite ± chlorite alteration zones containing 2-8% fine disseminated and a system of sub conformable, dislocated, smoky grey quartz veinlets and lenses. Veins generally vary from 5-20% of the bulk volume of the zones with individual quartz lenses commonly 5-15 centimetres wide.
MISHI MINE PROVEN & PROBABLE RESERVES
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