Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Jun. 30, 2021 USD ($) a MiningClaim
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
Annual lease payment made	$ 60,000
Grassy Mountain Project | Minimum [Member]
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
Total consideration paid	$ 10,000
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