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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Segment Information Three Months
(in thousands)  Three months ended September 30, 2012
    Mt Hamilton    Exploration    Corporate and Other    Consolidated 
Exploration expense  $(6)  $513   $—     $507 
Interest expense   41    —      64    105 
Other   16    (8)   1,194    1,202 
Pre-tax income (loss)  $51   $505   $1,258   $1,814 
Segment Information Nine Months
(in thousands)  Nine months ended September 30, 2012
    Mt Hamilton    Exploration    Corporate and Other    Consolidated 
Exploration expense  $308   $1,277   $—     $1,585 
Interest expense   143    —      103    246 
Other (1)   43    692    566    1,301 
Pre-tax income (loss)  $494   $1,969   $669   $3,132 
Total assets (2)(3)  $14,216   $1,768   $8,415   $24,399 
Capital Expenditures  $2,589   $3   $51   $2,643