Asset Retirement Obligation (Details Textual)	6 Months Ended
	Jun. 30, 2017
Maximum [Member]
Asset Retirement Obligation (Textual)
Risk free interest rate	10.00%
Estimated useful lives of mine property	12 years
Minimum [Member]
Asset Retirement Obligation (Textual)
Risk free interest rate	8.00%
Estimated useful lives of mine property	5 years