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Mineral Properties (Details Narrative) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Annual advance royalty payments due to underlying leaseholder		$ 300us-gaap_PaymentsToAcquireMineralRights
Optional royalty reduction payment		5,000us-gaap_IncreaseDecreaseInRoyaltiesPayable
Loan to affiliate partner				127us-gaap_DueFromAffiliateCurrent
Loan repayment, including interest, from partner			131us-gaap_ProceedsFromCollectionOfLoansReceivable
Company portion of member distribution			200us-gaap_OtherOwnershipInterestsCumulativeCashDistributions
Sale of net smelter royalty	10,000us-gaap_RoyaltyRevenue
Reduction to mineral property from net smelter royalty sale				3,000XPL_ReductionToMineralProperties
Deferred gain recorded as liability on net smelter royalty sale		7,000us-gaap_DeferredGainOnSaleOfProperty	7,000us-gaap_DeferredGainOnSaleOfProperty	7,000us-gaap_DeferredGainOnSaleOfProperty
Advance royalty payment capitalized		300us-gaap_PrepaidMineralRoyaltiesNoncurrent	300us-gaap_PrepaidMineralRoyaltiesNoncurrent
Unrecognized loss in unconsolidated subsidiary related to 49% interest		652us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Net operating loss of Pedra Branca (an unconsolidated subsidiary)		$ 1,643us-gaap_IncomeLossFromSubsidiariesBeforeTax	$ 2,065us-gaap_IncomeLossFromSubsidiariesBeforeTax

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- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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Amount before tax of income (loss) of subsidiary attributable to the parent entity.

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The increase (decrease) during the reporting period in the obligations due for compensation payments related to the use of copyrights, patents, trade names, licenses, technology. Royalty payments are also paid by the lease holders for oil, gas, and mineral extraction.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Aggregate cumulative cash distributions made to the other unit holders in a limited partnership or master limited partnership. Does not include limited or general partners' ownership interests.

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The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.

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Carrying amount as of the balance sheet date of capitalized amounts paid for mineral royalties which will be charged against earnings after one year or beyond the normal operating cycle, if longer.

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The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

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Decrease in value of mineral properties.

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