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Mineral Properties - Additional Information (Details) | 9 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Jun. 30, 2018 USD ($) a MiningClaim | Jun. 30, 2017 USD ($)
Mineral Properties [Line Items] |  |  |
Total payment to acquire all rights to the private land | $ |  | $ 2,400,000 |
Gain on sale of non-core mining claims | $ |  |  | $ 100,000
Sleeper Gold Project | Nevada |  |  |
Mineral Properties [Line Items] |  |  |
Unpatented mining claims |  | 2,322 |
Area covered by lode mining claims | a |  | 38,300 |
Grassy Mountain Project | Oregon |  |  |
Mineral Properties [Line Items] |  |  |
Unpatented lode mining claims |  | 418 |
Patented lode mining claims |  | 3 |
Mill site mining claims |  | 9 |
Association placer claims |  | 6 |
Area covered by mining claims | a |  | 9,300 |
Percentage of Net Smelter Royalty | 6.00% | 1.50% |
Total payment to acquire all rights to the private land | $ |  | $ 2,400,000 |

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- Definition Gain loss on sale of mineral property. + References No definition available. + Details
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- Definition Mineral properties. + References No definition available. + Details
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- Definition Area covered under various mining claims that the Entity owns. + References No definition available. + Details
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- Definition Number of association placer mining claims. + References No definition available. + Details
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- Definition Number of mill site mining claims. + References No definition available. + Details
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- Definition Number of patented lode mining claims. + References No definition available. + Details
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- Definition Number of unpatented lode mining claims. + References No definition available. + Details
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- Definition The number of mining claims that the company owns the right to that haven't been patented as of the balance sheet date. + References No definition available. + Details
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- Definition Percentage of net smelter royalty. + References No definition available. + Details
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- Definition Area covered under unpatented lode mining claims that the Entity owns. + References No definition available. + Details
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- Definition The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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