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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
 3 Months Ended
Mar. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations and Restricted Cash ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
The following table summarizes the Company’s asset retirement obligations:
 March 31, 2022December 31, 2021
Asset retirement obligation, beginning of period$13,687 $13,038 
 Revision of estimate96 (235)
 Disposal of non-core obligations— (269)
 Accretion of liabilities394 1,284 
 Settlements— (131)
Asset retirement obligation, end of period$14,177 $13,687 
Asset retirement obligation:  
 Current$220 $27 
 Non-current13,957 13,660 
Asset retirement obligation, end of period$14,177 $13,687 
The asset retirement obligations of the Company are subject to legal and regulatory requirements. Estimates of the costs of reclamation are reviewed periodically by the Company and the applicable regulatory authorities. The above provision represents the Company’s best estimate of the present value of future reclamation costs, discounted using credit adjusted risk-free interest rates ranging from 9.50% to 11.67% and inflation rates ranging from 2.00% to 2.41%. The total undiscounted decommissioning liability at March 31, 2022 is $42.75 million (December 31, 2021 - $41.34 million).
The following table summarizes the Company’s restricted cash:
 March 31, 2022December 31, 2021
Restricted cash, beginning of period$20,305 $20,817 
Additional collateral posted11 48 
Refunds of collateral— (560)
Restricted cash, end of period$20,316 $20,305 
The Company has cash, cash equivalents and fixed income securities as collateral for various bonds posted in favor of the applicable state regulatory agencies in Arizona, Colorado, New Mexico, Texas, Utah and Wyoming, and the U.S. Bureau of Land Management (“BLM”) and U.S. Forest Service (“USFS”) for estimated reclamation costs associated with the Mill, Nichols Ranch, Alta Mesa and other mining properties. Cash equivalents are short-term highly liquid investments with original maturities of three months or less. The restricted cash will be released when the Company has reclaimed a mineral property or restructured the surety and collateral arrangements. See Note 13 for a discussion of the Company’s surety bond commitments.