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Commitments and Contingencies Claim Rentals (Details) (USD $)	9 Months Ended
	Mar. 31, 2015
Tetlin Lease [Member]
Claim Rentals [Line Items]
Contractual Annual Exploration Costs	350,000ctgo_ContractualAnnualExplorationCosts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ctgo_TetlinLeaseMember
Gold Properties [Member]
Claim Rentals [Line Items]
Annual claim rentals	94,815ctgo_AnnualClaimRentals / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ctgo_GoldPropertiesMember
Native Village of Tetlin Land [Member]
Claim Rentals [Line Items]
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage	10 years

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- Definition

Annual Claim Rentals

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- Definition

Contractual Annual Exploration Costs

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- Definition

Initial & Renewal Terms of Leases and Concessions on Undeveloped Acreage

+ References

No definition available.

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- Details

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