Long-Term Reclamation Liability and Retirement Obligation Asset (Reconciliation of Aggregate Retirement Liability) (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2015 |
Dec. 31, 2014 |
|
| Mine Reclamation and Closing Liability [Roll Forward] | ||
| Long-term reclamation liability — beginning of period | $ 5,908,700 | $ 5,424,410 |
| Additional obligations incurred | 659,295 | 140,573 |
| Accretion of reclamation liability | 130,653 | 343,717 |
| Long-term reclamation liability — end of period | $ 6,698,648 | $ 5,908,700 |