Reclamation and Environmental Obligation - Schedule of Variables of Weighted Average (Details)	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Environmental Remediation Obligations [Abstract]
Weighted average credit adjusted risk free rate	9.89%	9.76%
Weighted-average inflation rate	2.31%	1.60%

This element represents the weighted average risk free rate used to discount the claim liability related to financial guarantee insurance contracts.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 9
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=99382878&loc=SL5749324-161292

Name:	us-gaap_FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration