13. Income Taxes (Details 2) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred tax asset:
Foreign exploration costs	$ 15,372	$ 47,011
Foreign net operating loss carryforward	1,537,420	1,309,445
Federal and state net operating loss carry forward	443,100	465,145
Other	1,455	0
Deferred tax asset	1,997,347	1,821,601
Valuation allowance (foreign)	(1,537,420)	(1,309,445)
Valuation allowance (federal)	(316,793)	(299,522)
Total deferred tax asset	143,134	212,634
Deferred tax liability:
Property, plant, and equipment	(143,134)	(210,912)
Other	0	(1,722)
Total deferred tax liability	(143,134)	(212,664)
Net deferred tax assets	$ 0	$ 0