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Mineral Properties (Details Narrative) (Parenthetical)	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Solitario percentage interest in Pedra Branca do Mineracao, Brazil, an unconsolidated subsidiary	49.00%XPL_InterestInUnconsolidatedSubsidiary

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- Details

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- Definition

Percent of interest owned in unconsolidated subsidiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	XPL_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant