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Properties, Plant and Equipment
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Properties, Plant and Equipment
Properties, Plant and Equipment

Properties, plant and equipment consisted of the following:

 
June 30, 2018
 
December 31, 2017
Land and building
$
9,169,605

 
$
9,169,605

Vehicle and equipment
2,357,367

 
2,414,216

Processing and laboratory
21,166,497

 
21,166,497

Furniture and fixtures
755,665

 
755,665

 
33,449,134

 
33,505,983

Less accumulated depreciation
(22,285,143
)
 
(20,724,250
)
 Total properties, plant and equipment
$
11,163,991

 
$
12,781,733



During the three and six-month periods ended June 30, 2018, the Company recognized depreciation expense of $0.8 million and $1.6 million, respectively. During the three and six-month periods ended June 30, 2017, the Company recognized depreciation expense of $1.0 million and $2.1 million, respectively.