Other Assets	9 Months Ended
Mar. 31, 2013
Other Assets [Abstract]
Other Assets	Other Assets If the Tetlin Lease is placed into commercial production, the Company would be obligated to pay a production royalty to the Tetlin Village Council, which varies from 2.0% to 5.0%, depending on the type of metal produced and the year of production. In June 2011, the Company paid the Tetlin Village Council $75,000 in exchange for reducing the production royalty payable to them by 0.25%. In July 2011, the Company paid the Tetlin Village Council $150,000 in exchange for further reducing the production royalty by 0.50%. These payments lowered the production royalty payable to a range of 1.25% to 4.25%, depending on the type of metal produced and the year of production. On or before July 15, 2020, the Tetlin Village Council has the option to increase their production royalty by (i) 0.25% by payment to CORE of $150,000, or (ii) 0.50% by payment to CORE of $300,000, or (iii) 0.75% by payment to CORE of $450,000. The Company has classified these payments as “Other Assets” in the financial statements of the Company.

Other Assets

If the Tetlin Lease is placed into commercial production, the Company would be obligated to pay a production royalty to the Tetlin Village Council, which varies from 2.0% to 5.0%, depending on the type of metal produced and the year of production. In June 2011, the Company paid the Tetlin Village Council $75,000 in exchange for reducing the production royalty payable to them by 0.25%. In July 2011, the Company paid the Tetlin Village Council $150,000 in exchange for further reducing the production royalty by 0.50%. These payments lowered the production royalty payable to a range of 1.25% to 4.25%, depending on the type of metal produced and the year of production. On or before July 15, 2020, the Tetlin Village Council has the option to increase their production royalty by (i) 0.25% by payment to CORE of $150,000, or (ii) 0.50% by payment to CORE of $300,000, or (iii) 0.75% by payment to CORE of $450,000. The Company has classified these payments as “Other Assets” in the financial statements of the Company.