Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details)

v3.3.0.814
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