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Segment Reporting - Segment Information Three Months (Details) (USD $)
 3 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Exploration Expense Mt Hamilton $ (6)
Exploration Expense Exploration 513
Exploration Expense Corporate and Other   
Exploration Expense Consolidated 507
Interest expense Mt Hamilton 41
Interest expense Exploration   
Interest expense Corporate and Other 64
Interest expense Consolidated 105
Other Mt Hamilton 16
Other Exploration (8)
Other Corporate and Other 1,194
Other Consolidated 1,202
Pre-tax income (loss) Mt Hamilton 51
Pre-tax income (loss) Exploration 505
Pre-tax income (loss) Corporate and Other 1,258
Pre-tax income (loss) Consolidated $ 1,814