Quarterly report pursuant to Section 13 or 15(d)

10. ASSET RETIREMENT OBLIGATIONS (Tables)

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10. ASSET RETIREMENT OBLIGATIONS (Tables)
9 Months Ended
Sep. 30, 2019
Asset Retirement Obligation [Abstract]  
Asset retirement obligation
Asset retirement obligations – December 31, 2018   $ 14,353  
         
Accretion expense     426  
Estimated liabilities recorded     8,397  
         
Asset retirement obligations – September 30, 2019   $ 23,176