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Decommissioning Provision (Details) - CAD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2019
Decommissioning Provision |  |  |
Balance at June 30, 2020 | $ 123,940 | $ 136,280 |
Beginning balance at June 30, 2019 | 126,780 | 123,940 |
Effect of movement in foreign exchange rates | 2,840 | (12,340) |
Beginning balance at June 30, 2019 | $ 126,780 | $ 123,940 |

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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Section D Examples: disclosures -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D__IAS37_IE_D_TI -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_87&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effect of foreign exchange on decommissioning provision. + References No definition available. + Details
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Namespace Prefix: | sli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | sli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration