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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Shareholders' equity: |  |
Common Shares, par value | $ 0 | $ 0
Common shares issued and outstanding, Ending balance (in shares) | 82,275,217 | 81,563,498
Accumulated deficit during exploration stage | $ 194,813 | $ 135,325

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