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Commitments and Contingencies - PT Newmont Nusa Tenggara (Details) - plaintiff
1 Months Ended 12 Months Ended 48 Months Ended 51 Months Ended 60 Months Ended
Apr. 08, 2015
May. 06, 2011
Dec. 17, 2010
Feb. 28, 2010
Dec. 31, 2006
Dec. 31, 2010
Mar. 31, 2010
Dec. 31, 2010
Sep. 30, 2015
Mar. 31, 2009
Mar. 31, 2008
Mar. 31, 2007
Mar. 31, 2006
Newmont Mining Corporation | PTNNT - Batu Hijau                          
Loss contingencies                          
Newmont equity interest ownership (as a percent)                 31.50%        
Newmont Mining Corporation | PTNNT - Batu Hijau | Batu Hijau | Required divestiture                          
Loss contingencies                          
Interest to be offered (as a percent)         3.00% 7.00%              
Aggregate interest to be offered               31.00%          
Newmont Mining Corporation | PTNNT - Batu Hijau | Batu Hijau | Required divestiture | Minimum                          
Loss contingencies                          
Percentage of ownership shares by the Indonesian government or Indonesian nationals in PTNNT             51.00%     44.00%     23.00%
Newmont Mining Corporation | PTNNT - Batu Hijau | Batu Hijau | Required divestiture | Ministry of Energy and Mineral Resources                          
Loss contingencies                          
Sale and transfer of shares of interest percent     7.00%                    
Newmont Mining Corporation | PTNNT - Batu Hijau | Batu Hijau | Required divestiture | PIP                          
Loss contingencies                          
Sale and transfer of shares of interest percent   7.00%                      
PTNNT - Batu Hijau | Jakarta State Administrative Court                          
Loss contingencies                          
Loss contingency number of plaintiffs 2                        
PTNNT - Batu Hijau | PTNNT - Batu Hijau | Batu Hijau | Required divestiture | Minimum                          
Loss contingencies                          
Percentage of ownership shares by the Indonesian government or Indonesian nationals in PTNNT                     37.00% 30.00%  
PTPI | PTNNT - Batu Hijau                          
Loss contingencies                          
Other company ownership percentage in affiliate             20.00%            
PTMDB | PTNNT - Batu Hijau | Batu Hijau | Required divestiture                          
Loss contingencies                          
PTMDB's ownership in PTNNT       24.00%