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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Asset retirement obligation	$ 18,972	$ 19,104	$ 18,280
Canyon Project
Other Commitments [Line Items]
Loss contingency, estimate of possible loss	20,080	19,650
Asset retirement obligation	41,750	$ 41,320
Mining Properties and Mineral Rights
Other Commitments [Line Items]
Leasing costs due in the 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.

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

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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