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Commitments and Contingencies - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2018
Loss Contingencies [Line Items] |
Percentage of royalty obligations, majority are less than | 3.00%
Minimum |
Loss Contingencies [Line Items] |
Percentage of royalty obligations | 0.50%
Maximum |
Loss Contingencies [Line Items] |
Percentage of royalty obligations | 5.00%

X
- Definition Net Smelter Return Royalty, Percentage + References No definition available. + Details
Name: | lode_NetSmelterReturnRoyaltyPercentage
Namespace Prefix: | lode_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Net Smelter Return Royalty. + References No definition available. + Details
Name: | lode_PercentageNetSmelterReturnRoyalty
Namespace Prefix: | lode_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |