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Properties, Plant and Equipment, Net
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Properties, Plant and Equipment, Net
Properties, Plant and Equipment, Net
 
Properties, plant and equipment at December 31, 2017 and 2016 consisted of the following:
 
 
2017
 
2016
Land and building
$
9,169,605

 
$
7,827,490

Vehicle and equipment
2,414,216

 
3,299,143

Processing and laboratory
21,166,497

 
21,049,497

Furniture and fixtures
755,665

 
755,665

 
33,505,983

 
32,931,795

Less accumulated depreciation
(20,724,250
)
 
(17,783,228
)
 Total properties, plant and equipment
$
12,781,733

 
$
15,148,567


 
For the years ended December 31, 2017, 2016 and 2015, the Company recognized depreciation expense of $3.9 million, $5.1 million, and $6.4 million, respectively.

For the years ended December 31, 2017, 2016 and 2015, the Company sold land and equipment with total proceeds of $1.1 million, $3.3 million, and $0.8 million, respectively and recorded a gain on the sale of that land and equipment totaling $0.3 million, $0.4 million, and $0.2 million, respectively.

Assets Held For Sale

The Company committed to a plan to sell certain land and buildings. As of December 31, 2017, the Company had assets with a net book value of $5.4 million that met the criteria to be classified as assets held for sale. Those criteria specify that the asset must be available for immediate sale in its present condition (subject only to terms that are usual and customary for sales of such assets), the sale of the asset must be probable, and its transfer expected to qualify for recognition as a completed sale generally within one year. Proceeds from the sale of these assets are required to be used to satisfy obligations due under the terms of the debenture with GF Comstock 2 LP as described in Note 9.