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Commitments and Contingencies (Tables)
6 Months Ended
Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Royalty Payable

FOB Mine Value per Ton   Percentage Royalty  
$00.00 to $50.00     5 %
$50.01 to $100.00     7 %
$100.01 to $150.00     9 %
$150.01 and up     10 %

Schedule of Future Minimum Lease Payments

The future minimum lease payments under these mining leases are as follows:

 

2018   $ 2,240  
2019     2,240  
2020     2,240  
2021     2,240  
2022     2,240  
Thereafter     3,200  
    $ 14,400