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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Operating activities: |  |
Net loss | $ (2,005) | $ (3,598)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
(Gain) loss on derivative instruments | (90) | 30
Depreciation and amortization | 26 | 61
Gain on early termination of debt | (313) |
Loss on equity method investment | 1,012 | 488
Property abandonment and impairment | 13 | 31
Employee stock option expense | 420 | 732
Deferred income taxes | (176) | (648)
(Gain) loss on warrant liability | (998) | 488
Amortization of interest on debt discounts |  | 332
Gain on asset and equity security sales | (153) | (1,536)
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | 78 | 200
Accounts payable and other current liabilities | (51) | (84)
Net cash used in operating activities | (2,237) | (3,504)
Investing activities: |  |
Additions to mineral properties | (2,173) | (3,457)
Additions to other assets | (318) | (397)
Sale of derivative instrument, net | 90 | 51
Proceeds from sale of mineral property | 4,000 | 6,000
Proceeds from sale of marketable equity securities | 838 | 1,664
Proceeds from sale of other assets | 80 | 9
Net cash provided by investing activities | 2,517 | 3,870
Financing activities: |  |
Short-term borrowing | 2,300 | 2,665
Repayment of short-term borrowing | (2,998) | (3,165)
Repayment of long-term debt | (2,050) | (750)
Proceeds from issuance of debt, net | 2,000 | 912
Proceeds from issuance of common stock , net | 2,060 | 275
Proceeds from exercise of options | 184 |
Payment to noncontrolling interest | (550) | (300)
Noncontrolling interest contribution, net | 250 | 181
Net cash provided by (used in) financing activities | 1,196 | (182)
Net increase (decrease) in cash and cash equivalents | 1,476 | 184
Cash and cash equivalents, beginning of year | 616 | 432
Cash and cash equivalents, end of year | 2,092 | 616
Cash paid for interest, capitalized to mineral property | 186 | 87
Capitalized non-cash interest | 540 |
Capitalized depreciation | 30 |
Issuance of stock for mineral property | 41 |
Issuance of stock to non-controlling interest | 381 | 71
Shares of Ely marketable equity securities received upon payment of Augusta debt | 1,800 |
Royalty sale receivable |  | 4,000
Transfer of contra-noncontrolling interest to noncontrolling interest upon earn-in |  | 531
Disproportionate share entry from noncontrolling interest to additional paid in capital upon earn-in |  | 2,983
Debt financing costs |  | $ 588

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Name: | XPL_PaymentsMadeForAdditionsToMineralProperties
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_ProceedsFromLongTermDebt
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_ProceedsFromMineralPropertySaleReceivable
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_TransferOfContraNonControllingInterestToNonControllingInterestUponEarnIn
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_ValueOfMarketableEquitySecuritiesEly
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration