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7. Asset Retirement Obligation and Accrued Reclamation Costs | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation and Accrued Reclamation Costs | Changes to the asset retirement obligation balance during 2017 and 2016 are as follows:
Asset Retirement Obligation |  |  |
Balance December 31, 2015 |  | $ | 152,827 |
Accretion during 2016 |  |  | 5,455 |
Balance December 31, 2016 |  |  | 158,282 |
Accretion during 2017 |  |  | 5,790 |
Balance December 31, 2017 |  | $ | 164,072 |
The Company’s total asset retirement obligation and accrued reclamation costs of $271,572 and $265,782, at December 31, 2017 and 2016, respectively, include reclamation obligations for the Idaho and Montana operations of $107,500.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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