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Segment Reporting - Segment Reporting (Details) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mt. Hamilton    
(1) (4) Interest cost and depreciation capitalized to Mt. Hamilton mineral properties $ 171XPL_InterestCostAndDepreciationCapitalized
/ us-gaap_StatementBusinessSegmentsAxis
= XPL_MtHamiltonMember		 $ 161XPL_InterestCostAndDepreciationCapitalized
/ us-gaap_StatementBusinessSegmentsAxis
= XPL_MtHamiltonMember
Exploration    
(3)(5)Includes investment in unconsolidated subsidiary   153XPL_InvestmentInUnconsolidatedSubsidiaryIncludedInSegmentReporting
/ us-gaap_StatementBusinessSegmentsAxis
= XPL_ExplorationMember
Corporate and Other    
(2)(6) Includes investment in marketable securities $ 1,710XPL_InvestmentInMarketableSecuritiesIncludedInSegmentReporting
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 4,210XPL_InvestmentInMarketableSecuritiesIncludedInSegmentReporting
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember