Commitments and Contingencies - Additional Information (Details)	9 Months Ended
Mar. 31, 2020 USD ($) a MiningClaim
Commitments And Contingencies [Line Items]
Net rental expense	$ 38,288
Annual lease payment, year two	$ 10,575
Grassy Mountain Project
Commitments And Contingencies [Line Items]
Number of mining fields \| MiningClaim	44
Area covered by mining claims \| a	589
Annual lease payment, year one	$ 40,000
Annual lease payment, year two	40,000
Annual lease payment, thereafter	60,000
Option to purchase mining claims, price	$ 560,000
Term of the agreement	25 years
Grassy Mountain Project \| Minimum
Commitments And Contingencies [Line Items]
Royalty rate	2.00%
Grassy Mountain Project \| Maximum
Commitments And Contingencies [Line Items]
Royalty rate	4.00%
Frost Project \| Nevada
Commitments And Contingencies [Line Items]
Number of mining fields \| MiningClaim	40
Percentage of mining claim rights acquired	100.00%
Total consideration payable	$ 250,000
Percentage of Net Smelter Royalty	2.00%
Rate of right to reduce net smelter royalty by parent	1.00%
Payment to reduce NSR by parent	$ 1,000,000

Area of mining fields.

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Commitments and contingencies.

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Option to purchase mining claims price.

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Percentage of mining claim rights acquired.

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Percentage of net smelter royalty.

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Percentage of royalty.

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Rate of right to reduce net smelter royalty by parent.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of businesses acquired by the entity during the period.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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.

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