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Retirement Obligation Asset (Tables) | 6 Months Ended
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Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of the Aggregate Retirement Obligation Asset | Following is a reconciliation of the aggregate retirement obligation asset associated with our reclamation plan for our mining projects:
| Six Months Ended |  | Twelve Months Ended
| June 30, 2018 |  | December 31, 2017
Retirement obligation asset — beginning of period | $ | 282,745 |  |  | $ | 617,126 |
Additional obligations incurred | — |  |  | — |
Amortization of retirement obligation asset | (36,435 | ) |  | (334,381 | )
Retirement obligation asset — end of period | $ | 246,310 |  |  | $ | 282,745 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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