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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details)	3 Months Ended
	Mar. 31, 2018
Minimum
Revenue recognition
Percentage of metal production sold under annual or longer-term contracts	80.00%
Maximum
Revenue recognition
Percentage of metal production sold under annual or longer-term contracts	90.00%

X

- Definition

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+ References

No definition available.

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X

- Definition

The percentage of metal production sold under annual or longer-term contracts.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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