Properties, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment, Net

Depreciation is computed using the straight-line method over estimated useful lives as follows:

Building	7 to 15 years
Vehicles and equipment	3 to 7 years
Processing and laboratory	5 to 15 years
Furniture and fixtures	2 to 3 years

Properties, plant and equipment at December 31, 2016 and 2015 consisted of the following:

	2016			2015
Land and building	$	7,827,490		$	11,652,436
Vehicle and equipment	3,299,143			10,531,451
Processing and laboratory	21,049,497			21,049,497
Furniture and fixtures	755,665			901,425
	32,931,795			44,134,809
Less accumulated depreciation	(17,783,228		)	(17,537,950		)
Total properties, plant and equipment	$	15,148,567		$	26,596,859