Concentration of Credit Risk	6 Months Ended
Concentration of Credit Risk	Jun. 30, 2013
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk TCM is exposed to counterparty risk from its cash and cash equivalent balances and its reclamation deposits held by financial institutions and governmental entities. TCM monitors its positions with, and the credit quality of, the financial institutions and companies in which it invests its cash and cash equivalents and that hold its reclamation deposits. Counterparties to cash balances and its reclamation deposits, other than balances maintained in various bank operating accounts, are US and Canadian institutions and the US and Canadian governments. TCM manages its credit risk from its accounts receivable through its collection activities. As of June 30, 2013, TCM had five customers who owed TCM more than $3.0 million and accounted for approximately 41.9% of total accounts and other receivables outstanding. Another eight customers had balances greater than $1.0 million but less than $3.0 million that accounted for approximately 17.0% of total accounts and other receivables. All of these customers were compliant with credit terms and scheduled payment dates. TCM's maximum counterparty and credit risk exposure is the carrying value of its cash and cash equivalents and accounts receivable. The carrying amounts of accounts receivable, accounts payable, accrued liabilities and fixed-rate debt, excluding the 2017 Notes, 2018 Notes, 2019 Notes and tMEDS, as discussed in Notes 8 and 10, approximated fair value as of June 30, 2013.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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