disclosure requirements. ASU 2011-04 provides clarification for the following: The amendments in this update became effective for interim and annual periods beginning after December 15, 2011. Adoption of this guidance did  not have a material impact on our consolidated financial statements. In December of 2011, the FASB issued ASU 2011-11, Disclosures about Offsetting Assets and Liabilities, which enhances disclosure requirements  regarding an entity’s financial instruments and derivative instruments that are offset or subject to a master netting arrangement. This information about  offsetting and related netting arrangements will enable users of financial statements to understand the effect of those arrangements on the entity’s  financial position, including the effect of rights of setoff. The amendments are required for annual reporting periods beginning after January 1, 2013,  and interim periods within those annual periods. We are evaluating the impact of this guidance, but do not anticipate it will have a material impact on  our consolidated financial statements. Our cash is maintained in various financial institutions, with a large majority of our cash balances at December 31, 2012 invested in either U.S.  government paper (treasury or agency) or U.S. government or treasury money market funds which are not insured by the Federal Deposit Insurance  Corporation (“FDIC”). A small portion of our cash balances are held in bank accounts insured by the FDIC for up to $250,000 per institution . On  December 31, 2012, the unlimited insurance coverage for noninterest-bearing accounts provided under the Dodd-Frank Wall Street Reform and  Consumer Protection Act expired. Deposits that were previously insured for unlimited amounts are now aggregated with our interest bearing accounts  and insured up to $250,000. We have not experienced losses on cash balances exceeding the federally insured limits, but there can be no assurance  that we will not experience such losses in the future. At December 31, 2012 and 2011, the fair value of our non-current investments was $9.6 million and $3.9 million, respectively. Marketable equity  securities are carried at fair market value, as they are classified as “available-for-sale.” The basis of our non-current investments, representing equity  securities, was approximately $8.1 million and $3.5 million, respectively, at December 31, 2012 and 2011. During the fourth quarters of 2012 and 2011,  we recognized $1.2 million and $0.1 million losses, respectively, in current earnings on impairments of equity shares, as we determined the impairments  to be other-than-temporary. In 2012, we acquired common stock in other mining companies for a total cost of $5.8 million. In February 2011 we sold  stock having a cost basis of approximately $0.8 million for proceeds of $1.4 million, resulting in a pre-tax gain of approximately $0.6 million. At December 31, 2012, total unrealized gains of $1.6 million for investments held having a net gain position and total unrealized losses of $137,000  for non-current investments held having a net loss position were included in accumulated other comprehensive income (loss).  Various laws and permits require that financial assurances be in place for certain environmental and reclamation obligations and other potential  liabilities. Restricted investments primarily represent investments in money market funds and certificates of deposit. These investments (which included  current and non-current balances) are restricted primarily for reclamation funding or surety bonds and were $0.9 million at December 31, 2012, and  $0.9 million at December 31, 2011.  Our major components of properties, plants, equipment, and mineral interests are (in thousands): During 2012, we incurred total capital expenditures, excluding additions acquired under capital leases and adjustments to asset retirement  obligations, of approximately $116.8 million, which included $54.7 million at the Lucky Friday unit, and $50.4 million at the Greens Creek unit. During  2011 we had capital expenditures of $33.8 million related to the acquisition of the remaining 30% interest in the San Juan Silver project (see  Note 16  for  more information) . NoTE 3: propErTIES, plANTS, EquIpMENT AND MINErAl INTErESTS, AND lEASE CoMMITMENTS Properties, Plants, Equipment and Mineral Interests Restricted Cash and Investments Investments NoTE 2. CASh, INvESTMENTS, AND rESTrICTED CASh Cash 1. the application of the highest and best use of valuation premise concepts; 2. measuring the fair value of an instrument classified in shareholders’ equity; and 3. disclosures about fair value measurements. December 31, 2012 2011 Mining properties, including asset retirement obligations  $  294,573  $  286,873  Development costs 151,504 123,772 Plants and equipment 419,377 383,045 Land  15,788 11,188 Mineral interests 375,028 383,491 Construction in progress 176,925  125,045  1,433,195 1,313,414 Less accumulated depreciation, depletion and amortization  436,536  390,202  Net carrying value  $ 996,659  $ 923,212  [ HL:10-K ] F-11