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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 | $ 0 ctgo_AcquisitionCostsMiningPropertiesPeriodCost | $ 0 ctgo_AcquisitionCostsMiningPropertiesPeriodCost |  | $ 0 ctgo_AcquisitionCostsMiningPropertiesPeriodCost | $ 0 ctgo_AcquisitionCostsMiningPropertiesPeriodCost |
Exploration costs and claim rentals | 318,779 ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost | 254,174 ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost |  | 613,515 ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost | 6,874,708 ctgo_ExplorationCostsAndClaimRentalsMiningPropertiesPeriodCost |
Total costs incurred | 318,779 ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost | 254,174 ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost |  | 613,515 ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost | 6,874,708 ctgo_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 |  |  | $ 200,000 ctgo_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 |  |  |  |  |  | 675,000 ctgo_LeaseholdInterestAcreage / us-gaap_StatementGeographicalAxis = ctgo_NativeVillageOfTetlinLandMember

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- 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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- 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. + References No definition available. + Details
Name: | ctgo_CostsOfUnprovedPropertiesExcludedFromAmortizationMiningPropertiesPeriodCost
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
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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. + References No definition available. + Details
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Namespace Prefix: | ctgo_
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- Definition Initial & Renewal Terms of Leases and Concessions on Undeveloped Acreage + References No definition available. + Details
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- Definition Leasehold Interest Acreage + References No definition available. + Details
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- Definition Payment by Lessee to Remove Acreage Renewal Restriction + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Percentage of Acreage Available for Renewal + References No definition available. + Details
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- Details
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