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AMAK Asset Retirement Obligations
12 Months Ended
Dec. 31, 2020
AMAK  
Schedule of Equity Method Investments [Line Items]  
AMAK Asset Retirement Obligations Asset Retirement Obligations
During 2012, we recorded an ARO for deferred mine closure costs of approximately SR12,843,000. These deferred mine closure costs are being amortized over the estimated life of the mine. Amortization expense was approximately SR362,000, SR541,000, and SR745,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018.
Deferred mine closure costs consisted of the following at:
September 30,December 31,
20202019
Cost12,842,625 12,842,625 
Accumulated amortization(7,993,376)(7,631,120)
4,849,249 5,211,505 
A summary of changes in our provision for mine closure costs is as follows:
September 30,December 31,
202020192018
Balance, beginning of period16,625,347 16,063,136 15,519,938 
Accretion expense405,558 562,211 543,198 
Balance, end of period17,030,905 16,625,347 16,063,136 
ARO costs may increase or decrease significantly in the future as a result of changes in regulations, changes in engineering designs and technology, permit modifications or updates, changes in mine plans, inflation or other factors and as actual reclamation spending occurs.