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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Asset retirement obligation	$ 13,038	$ 18,972	$ 19,104
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	343
Canyon Project
Other Commitments [Line Items]
Loss contingency, estimate of possible loss	20,820	20,080
Asset retirement obligation	41,950	$ 41,750
Mining Properties and Mineral Rights
Other Commitments [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 1,490

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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+ References

No definition available.

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