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STATEMENT OF COMPLIANCE AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
 12 Months Ended
Dec. 31, 2017
Statement [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Property and equipment is recorded at cost. Buildings are depreciated using a 5 year straightline method. Equipment is depreciated over its estimated useful life using the declining balance method at a rate of 20% per annum. Depreciation on equipment used directly on exploration projects is included in exploration expenditures for that mineral property.
Description of reasons why presumption investor has significant influence is overcome when its interest in investee is more than twenty per cent If an investor holds 20% or more of the voting power of the investee, it is presumed that the investor has significant influence, unless it can be clearly demonstrated that this is not the case. Conversely, if the investor holds less than 20% of the voting power of the investee, it is presumed that the investor does not have significant influence, unless such influence can be clearly demonstrated.