Property, Plant and Equipment, Net - Disposals (Details)					3 Months Ended			9 Months Ended
	Jul. 20, 2020 CAD ($) shares	Jul. 20, 2020 USD ($) shares	Jul. 14, 2020 USD ($)	Apr. 09, 2020 $ / shares shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Property, plant and equipment
Property, plant and equipment, net					$ 5,343,000			$ 5,343,000		$ 6,031,000
Number of properties								2
Gain on sale of assets								25,000	$ 144,000
Other operating (expense) income, net					$ 24,000		$ 45,000	$ (78,000)	$ 225,000
Barrick Earn-In Agreement
Property, plant and equipment
Investment ownership percentage					30.00%			30.00%
Barrick Gold Corporation | Barrick Earn-In Agreement
Property, plant and equipment
Total work expenditure Incur								$ 10,000,000
Period for work expenditure								8 years
Work expenditure incur for year one								$ 500,000
Work expenditure incur for year two								500,000
Work expenditure incur for year three								1,000,000
Work expenditure incur for year four								1,000,000
Work expenditure incur for year five								1,000,000
Work expenditure incur for year six								2,000,000
Work expenditure incur for year seven								2,000,000
Work expenditure incur for year eight								2,000,000
Minimum work expenditures spend to withdraw agreement								$ 1,000,000
Number of Days Notice Required to Withdraw Agreement								30 days
NewCo | Barrick Earn-In Agreement
Property, plant and equipment
Investment ownership percentage					70.00%			70.00%
Sale of Santa Maria Property | Fabled Copper Corp. | Binding Letter of Intent Agreement
Property, plant and equipment
Percentage of interest claims	100.00%	100.00%
Number Of Business Days To Conduct Due Diligence	10 days	10 days
Secure Financing Amount	$ 4,000,000
Cash consideration received			$ 500,000
Consideration Received in Shares | shares | shares	1,000,000	1,000,000
First year anniversary consideration		$ 1,500,000
Second year anniversary consideration		$ 2,000,000
Percentage of royalty return	1.00%	1.00%
El Quevar Project | Barrick Gold Corporation | Barrick Earn-In Agreement
Property, plant and equipment
Investment ownership percentage				70.00%
Abelena Project
Property, plant and equipment
Carrying value of concessions allowed						$ 100,000
Other operating (expense) income, net						$ 100,000
Equipment Leased to Other Party [Member] | Velardena Properties
Property, plant and equipment
Property, plant and equipment, net					$ 500,000			$ 500,000		$ 500,000
Private Placement | Barrick Gold Corporation
Property, plant and equipment
Sale of Stock, Number of Shares Issued in Transaction | shares				4,719,207
Sale of Stock, Price Per Share | $ / shares				$ 0.2119