Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue	$ 21,938	$ 47,441
Cost of sales	(16,430)	(36,361)
Gross profit	5,508	11,080
Operating Income (Expenses):
Other operating income	0	1,505
Exploration expenses	(3,758)	(1,802)
Administrative expense	(6,962)	(5,852)
Depreciation expense	(300)	(165)
Impairment of mineral properties	(1,996)	0
Share-based payments expense	(127)	(190)
Interest expense	(2,131)	(1,665)
Total operating expense	(15,274)	(8,169)
Other Income/(Expenses)
Interest income	191	142
Gain/(loss) on foreign exchange	377	(12,761)
Accretion expense	(179)	(578)
Total other income/(expenses)	389	(13,197)
Income (loss) - before income taxes	(9,377)	(10,286)
Income tax benefit (expense)	(298)	2,440
Net income (loss)	(9,675)	(7,846)
Lomada Project
Revenue	4,750	0
Cost of sales	(3,879)	0
Gross profit	871	0
Operating Income (Expenses):
Other operating income		0
Exploration expenses	0	0
Administrative expense	0	0
Depreciation expense	0	0
Impairment of mineral properties	0	0
Share-based payments expense	0	0
Interest expense	0	0
Total operating expense	0	0
Other Income/(Expenses)
Interest income	0	0
Gain/(loss) on foreign exchange	0	0
Accretion expense	(46)	0
Total other income/(expenses)	(46)	0
Income (loss) - before income taxes	825	0
Income tax benefit (expense)	0	0
Net income (loss)	825	0
Cap-Oeste Project
Revenue	14,903	47,441
Cost of sales	(11,006)	(36,361)
Gross profit	3,897	11,080
Operating Income (Expenses):
Other operating income		0
Exploration expenses	(227)	0
Administrative expense	0	0
Depreciation expense	0	0
Impairment of mineral properties	0	0
Share-based payments expense	0	0
Interest expense	0	0
Total operating expense	(227)	0
Other Income/(Expenses)
Interest income	0	0
Gain/(loss) on foreign exchange	0	0
Accretion expense	(39)	0
Total other income/(expenses)	(39)	0
Income (loss) - before income taxes	3,631	11,080
Income tax benefit (expense)	0	0
Net income (loss)	3,631	11,080
Calcatreu Project
Revenue	0	0
Cost of sales	0	0
Gross profit	0	0
Operating Income (Expenses):
Other operating income		0
Exploration expenses	(1,300)	(1,720)
Administrative expense	(279)	(61)
Depreciation expense	(18)	(105)
Impairment of mineral properties	0	0
Share-based payments expense	0	0
Interest expense	0	0
Total operating expense	(1,597)	(1,886)
Other Income/(Expenses)
Interest income	34	0
Gain/(loss) on foreign exchange	(11)	(71)
Accretion expense	0	0
Total other income/(expenses)	23	(71)
Income (loss) - before income taxes	(1,574)	(1,957)
Income tax benefit (expense)	(193)	0
Net income (loss)	(1,767)	(1,957)
Martha and La Josefina Projects
Revenue	2,285
Cost of sales	(1,545)
Gross profit	740
Operating Income (Expenses):
Exploration expenses	(300)
Administrative expense	(871)
Depreciation expense	(115)
Impairment of mineral properties	0
Share-based payments expense	0
Interest expense	0
Total operating expense	(1,286)
Other Income/(Expenses)
Interest income	0
Gain/(loss) on foreign exchange	(152)
Accretion expense	(94)
Total other income/(expenses)	(246)
Income (loss) - before income taxes	(792)
Income tax benefit (expense)	(866)
Net income (loss)	(1,658)
COSE Project
Revenue		0
Cost of sales		0
Gross profit		0
Operating Income (Expenses):
Other operating income		1,505
Exploration expenses		0
Administrative expense		0
Depreciation expense		0
Impairment of mineral properties		0
Share-based payments expense		0
Interest expense		0
Total operating expense		1,505
Other Income/(Expenses)
Interest income		0
Gain/(loss) on foreign exchange		0
Accretion expense		0
Total other income/(expenses)		0
Income (loss) - before income taxes		1,505
Income tax benefit (expense)		0
Net income (loss)		1,505
Argentina, Uruguay and Chile
Revenue	0	0
Cost of sales	0	0
Gross profit	0	0
Operating Income (Expenses):
Other operating income		0
Exploration expenses	(1,931)	(82)
Administrative expense	(4,072)	(4,706)
Depreciation expense	(67)	(60)
Impairment of mineral properties	0	0
Share-based payments expense	0	0
Interest expense	(765)	(1,275)
Total operating expense	(6,835)	(6,123)
Other Income/(Expenses)
Interest income	157	142
Gain/(loss) on foreign exchange	628	(12,252)
Accretion expense	0	(578)
Total other income/(expenses)	785	(12,688)
Income (loss) - before income taxes	(6,050)	(18,811)
Income tax benefit (expense)	761	2,440
Net income (loss)	(5,289)	(16,371)
UK
Revenue	0	0
Cost of sales	0	0
Gross profit	0	0
Operating Income (Expenses):
Other operating income		0
Exploration expenses	0	0
Administrative expense	(1,433)	(1,005)
Depreciation expense	(100)	0
Impairment of mineral properties	(1,996)	0
Share-based payments expense	(40)	(190)
Interest expense	(782)	(390)
Total operating expense	(4,351)	(1,585)
Other Income/(Expenses)
Interest income	0	0
Gain/(loss) on foreign exchange	(440)	1,026
Accretion expense	0	0
Total other income/(expenses)	(440)	1,026
Income (loss) - before income taxes	(4,791)	(559)
Income tax benefit (expense)	0	0
Net income (loss)	(4,791)	(559)
North America
Revenue	0	0
Cost of sales	0	0
Gross profit	0	0
Operating Income (Expenses):
Other operating income		0
Exploration expenses	0	0
Administrative expense	(307)	(80)
Depreciation expense	0	0
Impairment of mineral properties	0	0
Share-based payments expense	(87)	0
Interest expense	(584)	0
Total operating expense	(978)	(80)
Other Income/(Expenses)
Interest income	0	0
Gain/(loss) on foreign exchange	352	(1,464)
Accretion expense	0	0
Total other income/(expenses)	352	(1,464)
Income (loss) - before income taxes	(626)	(1,544)
Income tax benefit (expense)	0	0
Net income (loss)	$ (626)	$ (1,544)