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Loans Payable - Note 5 - SMOM - Additional Information (Detail) - Note 5 - SMOM [Member] - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
May 03, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 20, 2018
Debt Instrument [Line Items] |  |  |  |
Aggregate amount issuable | $ 3,000,000 |  |  | $ 3,500,000
Interest rate, stated percentage | 10.00% |  |  |
Annual Principal Payment | $ 500,000 |  |  |
Loan balance |  | $ 3,500,000 |  |
Debt, interest expense |  | $ 80,411 | $ 44,795 |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible debt | $ 2,000,000 |  |  |
Neptune Minerals, Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accounts receivable assigned for loan | 50.00% |  |  |
Accounts receivable, gross | $ 0 |  |  |
Aldama Mining Company, S.de R.L. de C.V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of equity interest | 10.00% |  |  |
Value of equity interest | $ 1,000,000 |  |  |
Aldama Mining Company, S.de R.L. de C.V [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of equity interest | 50.00% |  |  |

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