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Long-Term Reclamation Liability (Tables) | 3 Months Ended
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Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of the Aggregate Reclamation Liability | Following is a reconciliation of the aggregate reclamation liability associated with our reclamation plan for our mining projects:
| Three Months Ended |  | Twelve Months Ended
| March 31, 2019 |  | December 31, 2018
Long-term reclamation liability — beginning of period | $ | 7,441,091 |  |  | $ | 7,417,680 |
Additional obligations incurred | — |  |  | — |
Accretion of reclamation liability | 5,710 |  |  | 23,411 |
Long-term reclamation liability — end of period | $ | 7,446,801 |  |  | $ | 7,441,091 |

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