DESCRIPTION OF BUSINESS - Restructuring Costs and Reserves (Details)								1 Months Ended				12 Months Ended		32 Months Ended
	Dec. 09, 2019 USD ($)	Sep. 30, 2019 USD ($)	Apr. 30, 2019 USD ($)	Oct. 17, 2018 USD ($) shares	Oct. 16, 2017 USD ($) tranche	Apr. 12, 2017 USD ($)	Nov. 02, 2015 USD ($) tranche	Mar. 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Oct. 31, 2018 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Sep. 27, 2019 USD ($)
Class of Stock [Line Items]
POS-Mineral's continued contribution to all other costs of project (as a percent)												20.00%
Net proceeds				$ 2,000,000
Number of units issued during the period | shares				9,151,000
AMER International Group
Class of Stock [Line Items]
Private Placement	$ 4,000,000
Number of tranche investment | tranche							3
Ranchers
Class of Stock [Line Items]
Source from available cash												$ 500,000
Proceeds from private placement used												500,000
First Tranche | AMER International Group
Class of Stock [Line Items]
Private Placement							$ 4,000,000
Second Tranche | AMER International Group
Class of Stock [Line Items]
Private Placement					$ 6,000,000
Number of tranche investment | tranche					3
Third Tranche | AMER International Group
Class of Stock [Line Items]
Private Placement							$ 10,000,000					5,000,000
ATM
Class of Stock [Line Items]
Issue of shares | shares														1,168,300
Net proceeds											$ 1,900,000		$ 486,000	$ 500,000
Number of units issued during the period | shares											9,125,000
Number of shares of common stock in each unit issued | shares											1
Number of warrants in each unit issued | shares											1
Number of shares each unit may purchase | shares											1
Period of time the ATM is suspended (in years)				2 years							2 years
ATM | Maximum
Class of Stock [Line Items]
Net proceeds						$ 20,000,000
Eureka Moly LLC | Ranchers
Class of Stock [Line Items]
Payment to trust												1,000,000
Source from available cash												500,000
Proceeds from private placement used												500,000
Advance from proceeds of ongoing sales of non-critical EMLLC assets and lands												$ 1,000,000		$ 1,000,000
Eureka Moly LLC | Land and Water Rights
Class of Stock [Line Items]
Amount owed to the company															$ 700,000
Reimbursement of debt									$ 200,000	$ 200,000
Eureka Moly LLC | Equipment | Minimum
Class of Stock [Line Items]
Sale of equipment									400,000
Eureka Moly LLC | Land and Water Rights
Class of Stock [Line Items]
Amount owed to the company															$ 700,000
Eureka Moly LLC | Equipment | Minimum | Subsequent event
Class of Stock [Line Items]
Sale of equipment								$ 400,000
LLC Agreement | Land and Water Rights
Class of Stock [Line Items]
Reimbursement of debt		$ 200,000							$ 200,000
LLC Agreement | Land and Water Rights | Subsequent event
Class of Stock [Line Items]
Reimbursement of debt								$ 300,000
Mt. Hope Project | Ranchers
Class of Stock [Line Items]
Settlement payment			$ 1,000,000