Nature of Operations (Details) - Mt Todd, Australia oz in Millions	9 Months Ended
Sep. 30, 2020 oz
Property, Plant and Equipment [Line Items]
Percentage of ownership in project	100.00%
Proved Undeveloped Mine Reserve, Mass	5.3
Property, Plant and Equipment, Useful Life	13 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration