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Properties, Plant and Equipment
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Properties, Plant and Equipment
Properties, Plant and Equipment

Properties, plant and equipment consisted of the following:
 
March 31, 2019
 
December 31, 2018
Land and building
$
9,140,805

 
$
9,169,605

Vehicle and equipment
2,335,360

 
2,319,290

Processing and laboratory
21,113,178

 
21,129,248

Furniture and fixtures
549,860

 
648,309

Construction in progress
35,190

 
35,190

 
33,174,393

 
33,301,642

Less accumulated depreciation
(24,026,306
)
 
(23,559,522
)
 Total properties, plant and equipment
$
9,148,087

 
$
9,742,120



During the three-month periods ended March 31, 2019, and March 31, 2018, the Company recognized depreciation expense of $0.5 million and $0.8 million, respectively.