7. Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2017

Property and equipment:

Property and equipment

	June 30,			December 31,
	2017			2016
Property and equipment	$	128,155		$	140,547
Less: Accumulated depreciation and amortization		(112,344	)		(112,128	)
Total property and equipment, net	$	15,811		$	28,419

Depreciation, depletion, and amortization expense

	Six Months Ended
	June 30,
	2017		2016
Depletion of costs for evaluated oil and gas properties (1)	$	–	$	3,114,347
Depreciation and amortization of other property and equipment		5,734		7,364
Total depreciation, amortization and depletion	$	5,734	$	3,121,711

⁽¹⁾Presented as a component of loss from discontinued operations, net of income taxes.