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Mineral Properties (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Mineral properties	$ 16,646	$ 16,646
Lik project (Alaska - US) [Member]
Mineral properties	15,611	15,611
Golden Crest (South Dakota - US) [Member]
Mineral properties	$ 1,035	$ 1,035

X

- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 932
-SubTopic 360
-Name Accounting Standards Codification
-Section 25
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482479/932-360-25-7

+ Details

Name:	us-gaap_MineralPropertiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=xpl_LikProjectsAlaskaUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=xpl_GoldenCrestSouthDakotaUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: