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Mineral Properties - Investment in Mineral Property (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mt. Hamilton 2014
Development (United States)	$ 14,641us-gaap_ConstructionAndDevelopmentCosts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_MtHamilton2014Member	$ 12,059us-gaap_ConstructionAndDevelopmentCosts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_MtHamilton2014Member
Total Mineral Property 2014
Total	14,660us-gaap_PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_TotalMineralProperty2014Member	12,098us-gaap_PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_TotalMineralProperty2014Member
La Promesa Peru 2014
Exploration	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_LaPromesaPeru2014Member	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_LaPromesaPeru2014Member
Total Exploration 2014
Exploration	19XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_TotalExploration2014Member	39XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_TotalExploration2014Member
Norcan (Mexico) 2013
Exploration	6XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_NorcanMexico2013Member	6XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_NorcanMexico2013Member
Pachuca (Mexico) 2014
Exploration		20XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_PachucaMexico2014Member
Aconchi (Mexico) 2013
Exploration	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_AconchiMexico2013Member	5XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_AconchiMexico2013Member
Canta Colorado (Mexico) 2014
Exploration	$ 3XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_CantaColoradoMexico2014Member	$ 3XPL_ExplorationExpenseMineralProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = XPL_CantaColoradoMexico2014Member

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

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- 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.

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- Definition

No authoritative reference available.

+ References

No definition available.

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