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REVENUE AND COST OF SALES (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue And Cost Of Sales      
Production costs $ 19,417,844 $ 17,263,182 $ 7,538,147
Depreciation and depletion 2,557,286 1,897,618 1,035,053
Cost of sales $ 21,975,130 $ 19,160,800 $ 8,573,200