Doré
Unrefined gold and silver bullion bars usually consisting of approximately
90% precious metals that will be further refined to almost pure metal.
Drift
A horizontal passageway in an underground mine that follows a vein of ore
or rock formation.
Dump
The site for disposal of waste rock from the mine that may be extremely
low grade.
EIS
Environmental impact study.
Flotation
The process of mixing powdered ore with water and chemical reagents to
separate the metallic particles from the waste rock; the metallic particles are
collected and dried and this concentrate is sent to the smelter for refining.
Gangue
The undesired materials or valueless mineral particles associated with ore
that must be rejected or discarded.
Geophysical
survey
A method of prospecting that measures and maps the physical properties
of rock formations by analyzing magnetic anomalies, assessing rock density
with gravity surveys, and measuring electrical conductivity anomalies and
radioactivity.
Grade
The amount of metal in each ton or tonne of ore, expressed as troy ounces
per ton or grams per tonne for precious metals and as a percentage for
other metals. A term such as cut-off grade refers to the minimum metal
grade at which an ore body can be economically mined.
Grizzly
A steel grate or mesh placed over a chute that restricts the size of ore or
rock that passes through.
Head grade
The average grade of ore fed into a mill.
Heap leaching
The process of extracting valuable metals (usually gold and silver) from
crushed ore by applying leaching solutions, which percolate through the
stacked ore (or heap) and are collected by a sloping, impermeable liner
below the heap.
Indicated Mineral
Resource*
That part of a Mineral Resource for which quantity, grade or quality,
densities, shape and physical characteristics, can be estimated with a level
of confidence sufficient to allow the appropriate application of technical
and economic parameters, to support mine planning and evaluation of the
economic viability of the deposit. The estimate is based on detailed and
reliable exploration and testing information gathered through appropriate
techniques from locations such as outcrops, trenches, pits, workings and drill
holes that are spaced closely enough for geological and grade continuity to
be reasonably assumed.
Industrial mineralsNon-metallic minerals used in the chemical and manufacturing industries.
Inferred Mineral
Resource*
That part of a Mineral Resource for which quantity and grade or quality can
be estimated on the basis of geological evidence and limited sampling and
reasonably assumed, but not verified, geological and grade continuity. The
estimate is based on limited information and sampling gathered through
appropriate techniques from locations such as outcrops, trenches, pits,
workings and drill holes.
© 2013 KPMG LLP, a Canadian limited liability partnership and a member firm of the KPMG network of independent member firms
affiliated with KPMG International Cooperative (“KPMG International”), a Swiss entity. All rights reserved.
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A Guide to Canadian Mining Taxation