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Costs Incurred (Details) (USD $)	3 Months Ended			9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012	Mar. 31, 2015	Mar. 31, 2014	Nov. 29, 2010 acre
Costs Incurred to acquire and explore mining properties [Line Items]
Acquisition of mineral interests	$ 0ctgo_AcquisitionCostsMiningPropertiesPeriodCost	$ 0ctgo_AcquisitionCostsMiningPropertiesPeriodCost		$ 0ctgo_AcquisitionCostsMiningPropertiesPeriodCost	$ 0ctgo_AcquisitionCostsMiningPropertiesPeriodCost
Exploration costs and claim rentals	318,779ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost	254,174ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost		613,515ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost	6,874,708ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost
Total costs incurred	318,779ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost	254,174ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost		613,515ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost	6,874,708ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost
Percentage of Acreage Available for Renewal	50.00%ctgo_PercentageOfAcreageAvailableForRenewal	50.00%ctgo_PercentageOfAcreageAvailableForRenewal		50.00%ctgo_PercentageOfAcreageAvailableForRenewal	50.00%ctgo_PercentageOfAcreageAvailableForRenewal
Payment by Lessee to Remove Acreage Renewal Restriction			$ 200,000ctgo_PaymentByLesseeToRemoveAcreageRenewalRestriction
Native Village of Tetlin Land [Member]
Costs Incurred to acquire and explore mining properties [Line Items]
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage				10 years
Leasehold Interest Acreage						675,000ctgo_LeaseholdInterestAcreage / us-gaap_StatementGeographicalAxis = ctgo_NativeVillageOfTetlinLandMember

X

- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring mining properties.

+ References

No definition available.

+ Details

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- Definition

The sum of the both capitalized costs incurred and costs expensed during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs for mining properties.

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No definition available.

+ Details

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- Definition

Exploration expenses (including prospecting) and claim rentals related to the mining industry would be included in operating expenses. Exploration costs include costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of mineral reserves.

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No definition available.

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- Definition

Initial & Renewal Terms of Leases and Concessions on Undeveloped Acreage

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- Definition

Leasehold Interest Acreage

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No definition available.

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- Definition

Payment by Lessee to Remove Acreage Renewal Restriction

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No definition available.

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- Definition

Percentage of Acreage Available for Renewal

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No definition available.

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