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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2012
Segment Reporting [Abstract]  
Segment Reporting Three Months
(in thousands)  Three months ended June 30, 2012
    Exploration expense    Interest expense    Other    Pre-tax loss 
Mt. Hamilton development and
Operations		  $145   $49   $15   $209 
Exploration   409    —      388    797 
Corporate and other (1)   —      24    (683)   (659)
Consolidated  $554   $73   $(280)  $347 
Segment Reporting Six Months
(in thousands)  Six months ended June 30, 2012
    Exploration expense    Interest expense    Other    Pre-tax loss    Total assets    Capital expenditures 
Mt. Hamilton development and
operations		  $314   $102   $27   $443   $14,028   $1,044 
Exploration (1)   764    —      700    1,464    1,687    3 
Corporate and other (2)   —      39    (628)   (589)   8,917    9 
Consolidated  $1,078   $141   $99   $1,318   $24,632   $1,056