ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Environmental Remediation Obligations [Abstract] | ||
| Total environmental and mine closure obligations | $ 215.3 | $ 170.8 |
| X | ||||||||||
- Definition Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent No definition available.
|
| X | ||||||||||
- References No definition available.
|