Area of non core property under repurchase option.

No definition available.

Name:	reemf_AreaOfNonCoreRealPropertyUnderRepurchaseOption
Namespace Prefix:	reemf_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of payments for repurchase option extension.

+ References

No definition available.

+ Details

Name:	reemf_PaymentsForRepurchaseOptionExtension
Namespace Prefix:	reemf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the percentage of the total estimated cost for the project covered by outside funding.

+ References

No definition available.

+ Details

Name:	reemf_PercentageOfTotalEstimatedCostForProjectCoveredByFunding
Namespace Prefix:	reemf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price of repurchase option under the asset purchase agreement.

+ References

No definition available.

+ Details

Name:	reemf_RepurchaseOptionExercisePrice
Namespace Prefix:	reemf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of repurchase option extension payment per annum.

+ References

No definition available.

+ Details

Name:	reemf_RepurchaseOptionExtensionPaymentPerAnnum
Namespace Prefix:	reemf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Extension term of repurchase option of asset purchase agreement.

+ References

No definition available.

+ Details

Name:	reemf_RepurchaseOptionExtensionTerm
Namespace Prefix:	reemf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AssetAcquisitionAxis=reemf_AmendmentToWhitelawCreekAssetPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands		1 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Oct. 25, 2021 USD ($) a	Oct. 31, 2022 USD ($)	Mar. 31, 2023	Oct. 01, 2021
Commitments and Contingencies
Percentage of total estimated cost for the project covered by DoE funding			50.00%	50.00%
Amendment to Whitelaw Creek Asset Purchase Agreement
Commitments and Contingencies
Area of non core property \| a	640
Repurchase of option extension term	3 years
Repurchase of option extension payment per annum	$ 25
Exercise price of repurchase option	1,000
Payments for repurchase option extension		$ 25
Amendment to Whitelaw Creek Asset Purchase Agreement \| Maximum
Commitments and Contingencies
Exercise price of repurchase option	1,850
Amendment to Whitelaw Creek Asset Purchase Agreement \| Minimum
Commitments and Contingencies
Exercise price of repurchase option	$ 1,200