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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 869,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,092,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments in marketable equity securities, at fair value 2,308,000us-gaap_AvailableForSaleSecuritiesCurrent 1,577,000us-gaap_AvailableForSaleSecuritiesCurrent
Prepaid expenses and other 40,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 115,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 3,217,000us-gaap_AssetsCurrent 3,784,000us-gaap_AssetsCurrent
Mineral properties 14,660,000us-gaap_MineralPropertiesNet 12,098,000us-gaap_MineralPropertiesNet
Investments in marketable equity securities, at fair value    2,396,000us-gaap_AvailableForSaleSecurities
Equity method investment    153,000us-gaap_EquityMethodInvestments
Other assets 1,163,000us-gaap_OtherAssetsNoncurrent 1,069,000us-gaap_OtherAssetsNoncurrent
Total assets 19,040,000us-gaap_Assets 19,500,000us-gaap_Assets
Current liabilities:    
Accounts payable 343,000us-gaap_AccountsPayableCurrent 367,000us-gaap_AccountsPayableCurrent
Current portion long-term debt, net of discount 4,861,000us-gaap_LongTermDebtCurrent   
Short-term margin loan    802,000us-gaap_ShortTermNonBankLoansAndNotesPayable
Other    84,000us-gaap_OtherLiabilitiesCurrent
Total current liabilities 5,204,000us-gaap_LiabilitiesCurrent 1,253,000us-gaap_LiabilitiesCurrent
Long-term debt, net of discount    3,144,000us-gaap_LongTermDebtNoncurrent
Deferred gain on sale of mineral property 7,000,000us-gaap_DeferredGainOnSaleOfProperty 7,000,000us-gaap_DeferredGainOnSaleOfProperty
Warrant liability 55,000us-gaap_DerivativeLiabilities 140,000us-gaap_DerivativeLiabilities
Preferred stock, $0.01 par value, authorized 10,000,000 shares (none issued and outstanding at December 31, 2014 and 2013)      
Common stock, $0.01 par value, authorized, 100,000,000 shares (39,247,689 and 37,512,127 , respectively, shares issued and outstanding at December 31, 2014 and 2013) 393,000us-gaap_CommonStockValue 375,000us-gaap_CommonStockValue
Additional paid-in capital 54,512,000us-gaap_AdditionalPaidInCapital 51,963,000us-gaap_AdditionalPaidInCapital
Accumulated deficit (46,563,000)us-gaap_RetainedEarningsAccumulatedDeficit (44,730,000)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive (loss) income (1,120,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 460,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Solitario shareholders’ equity 7,222,000us-gaap_StockholdersEquity 8,068,000us-gaap_StockholdersEquity
Noncontrolling interest (441,000)us-gaap_MinorityInterest (105,000)us-gaap_MinorityInterest
Total shareholders' equity 6,781,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 7,963,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and shareholders' equity $ 19,040,000us-gaap_LiabilitiesAndStockholdersEquity $ 19,500,000us-gaap_LiabilitiesAndStockholdersEquity