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RELATED PARTY TRANSACTIONS (Details) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2016	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Common stock, shares, outstanding (in shares)					100,735,889	91,445,066
Testing permit and lease option agreement, payments	$ 1,030,000
Testing permit and lease option agreement, accrued liability					$ 360,000
Royalty percentage of minerals recovered sold under minimum price threshold			3.125%
Mineral price per pound, low range			$ 65.00
Royalty percentage of minerals recovered sold between price thresholds			6.25%
Mineral price per pound, upper range			$ 95.00
Royalty percentage of minerals recovered sold above maximum price threshold			7.50%
Payments for royalties					$ 0
Mestena Sellers
Related Party Transaction [Line Items]
Common stock, shares, outstanding (in shares)					4,303,032
Director
Related Party Transaction [Line Items]
Equity method, ownership percentage					81.00%
Proceeds from contributed capital					$ 50,000	$ 0	$ 360,000
Director | Leoncito Project, L.L.C.
Related Party Transaction [Line Items]
Common stock, shares, outstanding (in shares)	168,486	168,486		168,486
Testing permit and lease option agreement, payments		$ 600,000		$ 510,000
Testing permit and lease option agreement, percentage that may be paid in common shares			50.00%
Testing permit and lease option agreement, accrued liability					$ 300,000
Testing Permit and Lease Option Agreement, Payments Made In Common Stock				$ 510,000
Director | Mesteña LLC
Related Party Transaction [Line Items]
Sale of stock, number of shares issued in transaction (in shares)			4,551,284
Director | United Nuclear
Related Party Transaction [Line Items]
Equity method, ownership percentage					19.00%
The Grantors | Leoncito Project, L.L.C.
Related Party Transaction [Line Items]
Common stock, shares, outstanding (in shares)					97,786
Testing Permit and Lease Option Agreement, Payments Made In Common Stock					$ 300,000

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