Asset Retirement Obligation	3 Months Ended
Mar. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	Asset Retirement Obligation ("ARO")During the three months ended March 31, 2021 and 2020, the Company incurred $0.1 million of Accretion related to the ARO. Additionally, as of March 31, 2021 and December 31, 2020, the Company's ARO liability base was $4.9 million and $4.8 million, respectively. The Company did not incur any reclamation expenditures during the three months ended March 31, 2021 and 2020. As of March 31, 2021, the Company estimates that no significant reclamation expenditures associated with the ARO will be made until 2047 and that reclamation work will be completed by the end of 2065. During the three months ended March 31, 2021, there were no events or changes to the Company's regulatory environment that would require a change to the Company's ARO. As a result, the Company did not record any adjustments to the ARO due to changes in estimates.

Asset Retirement Obligation

3 Months Ended

Mar. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation ("ARO")During the three months ended March 31, 2021 and 2020, the Company incurred $0.1 million of Accretion related to the ARO. Additionally, as of March 31, 2021 and December 31, 2020, the Company's ARO liability base was $4.9 million and $4.8 million, respectively. The Company did not incur any reclamation expenditures during the three months ended March 31, 2021 and 2020. As of March 31, 2021, the Company estimates that no significant reclamation expenditures associated with the ARO will be made until 2047 and that reclamation work will be completed by the end of 2065. During the three months ended March 31, 2021, there were no events or changes to the Company's regulatory environment that would require a change to the Company's ARO. As a result, the Company did not record any adjustments to the ARO due to changes in estimates.