Inventories and Ore on Leach Pads - Schedule of inventory, Ore on leach pads (Details) $ in Thousands	Mar. 31, 2022 USD ($) oz	Dec. 31, 2021 USD ($) oz
Amount
Ore on leach pads \| $	$ 3,680	$ 10,106
Total \| $	$ 3,680	$ 10,106
Gold Ounces
Ore on leach pads \| oz	2,693	7,130
Total \| oz	2,693	7,130

Amount before valuation reserves of gold ore material contained on a leach pad.

No definition available.

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