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Mineral Property - Investment in Mineral Property (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Total mineral property	$ 14,987us-gaap_PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease	$ 14,660us-gaap_PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease
Mt. Hamilton
Development (United States)	14,968us-gaap_ConstructionAndDevelopmentCosts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_MtHamiltonMember	14,641us-gaap_ConstructionAndDevelopmentCosts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_MtHamiltonMember
La Promesa Peru
Exploration	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_LaPromesaPeruMember	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_LaPromesaPeruMember
Norcan Mexico
Exploration	6XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_NorcanMexicoMember	6XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_NorcanMexicoMember
Aconchi Mexico
Exploration	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_AconchiMexicoMember	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_AconchiMexicoMember
Canta Colorado Peru
Exploration	$ 3XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_CantaColoradoPeruMember	$ 3XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_CantaColoradoPeruMember

X

- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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X

- Definition

Amount of increase (decrease) of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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