The Company estimates its asset retirement obligations and related accrued reclamation costs using an expected cash flow approach, in which multiple cash flow scenarios are used to reflect a range of possible outcomes. During 2010, the Company completed an updated review of its reclamation plan and the related estimated costs of reclamation. As a result, as of December 31, 2010, the Company estimated the aggregate undiscounted obligation to be approximately $13,000,000 for the Johnson Camp Mine. However, as of March 31, 2011, the Company determined that certain aspects of the reclamation plan could be revised thus decreasing the estimated costs to reclaim the Johnson Camp Mine to approximately $9,100,000 (based on 2011 dollars). This estimate was subsequently refined during the quarter ended June 30, 2011 to $10,100,000.

To calculate the estimated fair value of this obligation, the projected cash flows, which were further adjusted for an estimated inflation rate of 2.5% per annum, were discounted at the Company’s estimated annual credit–adjusted risk free interest rate of 12.53% at April 1, 2011. The estimated remaining life of the Johnson Camp Mine as of March 31, 2013 is approximately twelve years. Accordingly, the cash expenditures for reclamation and closure activities are expected to occur at the conclusion of production, currently anticipated to be in 2024 – 2025. As 100% of the cash flows are projected to occur in 2024-2025, 100% of the accrued reclamation costs are classified as long-term within the condensed consolidated balance sheets. A reconciliation of the beginning and ending carrying amounts of the Company’s asset retirement obligation as of March 31, 2013 and December 31, 2012, respectively, are as follows:

		March 31,		December 31,
		2013		2012
		(unaudited)
Accrued reclamation costs, beginning of period	$	3,597,968	$	3,195,497
Accretion expense		111,674		402,471

Accrued reclamation costs, end of period	$	3,709,642	$	3,597,968