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Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	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: