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Asset retirement obligations (Tables)
12 Months Ended
Dec. 31, 2018
Asset Retirement Obligations  
Schedule of asset retirement obligations
    For the year ended December 31, 2018  
       
Asset retirement obligations, beginning of period   $ 0  
Liabilities assumed in acquisitions     228,721  
Accretion expense     1,929  
Asset retirement obligation, end of period   $ 230,650