XML 33 R23.htm IDEA: XBRL DOCUMENT v3.10.0.1

Capitalized Investment in Mineral Property - (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Lik Project Alaska [Member]
Exploration	$ 15,611	$ 15,611
La Promesa Project Peru [Member]
Exploration	6	6
Montana Royalty Property U S [Member]
Exploration	40	40
Total Exploration Mineral Property [Member]
Exploration	$ 15,657	$ 15,657

X

- References

No definition available.

+ Details

Name:	XPL_ExplorationExpenseMineralProperties
Namespace Prefix:	XPL_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=XPL_LikProjectAlaskaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=XPL_LaPromesaProjectPeruMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=XPL_MontanaRoyaltyPropertyUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=XPL_TotalExplorationMineralPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: