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v3.26.1

Commitments and contingencies (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2026 USD ($) officer lawsuit
Commitments and Contingencies Disclosure [Abstract] |
Number of class action lawsuits | lawsuit | 3
Number of officers | officer | 2
Proceeds from sale of royalty to Sprott | $ | $ 30.0
Smelter royalty obligation, percentage | 1.50%

X
- Definition Number Of Class Action Lawsuits + References No definition available. + Details
Name: | hymc_NumberOfClassActionLawsuits
Namespace Prefix: | hymc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Officers + References No definition available. + Details
Name: | hymc_NumberOfOfficers
Namespace Prefix: | hymc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with the assumption of a royalty obligation. + References No definition available. + Details
Name: | hymc_ProceedsFromRoyaltyObligation
Namespace Prefix: | hymc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of net smelter royalty payment obligation. + References No definition available. + Details
Name: | hymc_RoyaltyObligationSmelterNetPercent
Namespace Prefix: | hymc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration