Inventories and Ore on Leach Pads - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Capitalized costs	$ 0.5	$ 0.4
Capitalized costs, leach pads, current	$ 0.3	$ 0.6

Capitalized Costs, Inventory, Capitalized Depreciation and Amortization Costs

No definition available.

Name:	hymc_CapitalizedCostsInventoryCapitalizedDepreciationAndAmortizationCosts
Namespace Prefix:	hymc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant