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Exhibit L Skull Creek Sand Project <br /> All material volume and surface area calculations were performed utilizing Carlson Civil and Mining <br /> software. <br /> Cost data sources include: <br /> • RSMeans Heavy Cost Construction 2018 <br /> • RSMeans Construction Cost Data 2018 <br /> • CostMine Cost Guide 2017 (latest version available) <br /> • CostMine Mine and Mill Equipment Cost Data, 2017 (latest version available) <br /> These sources are applied where appropriate in each of the cost estimates. Each line item in the <br /> estimate lists specifies which source is utilized for cost data. <br /> Cost Estimates <br /> The following is a brief summary of the information and methods used to calculate the costs for each <br /> category.The overall cost estimates below include total escalated costs applicable for all three phases of <br /> reclamation (where appropriate): <br /> Point of Maximum Reclamation Liability Determination <br /> This section details the polygons, phases and facilities included in the determination of the point in time <br /> where the permit area faces a maximum reclamation liability.This estimate is directly based on the <br /> sequence and mining and reclamation plans described in Exhibit D of this Permit.The maximum liability <br /> amount is $2,682,314. <br /> Bond Polygon Cost Estimates <br /> This section tabulates the direct, indirect, and escalated reclamation costs for each polygon shown on <br /> Map E-2.These costs are also grouped by phase.The area totals shown at the bottom of these sheets <br /> are for illustrative purposes only and do not reflect actual liability. Instead, total liability is a function of <br /> the point of maximum liability discussed above. <br /> Production Model and Cost Assumptions <br /> Caterpillar's Fleet Production and Cost analysis software was utilized to establish a baseline cost model <br /> with inputs from the appropriate cost guides.This model provided unit costs on a $/BCY and $/LCY <br /> basis. <br /> The following documentation provides the details for each section of this bond estimate <br /> 2 <br /> 12/23/2019 <br />