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2019 Reclamation Cost Estimate Update—Henderson Mine& Mill ' <br /> 1 General Reclamation Update <br /> The Henderson Mine and Mill (Henderson) have been in operation for over 40 years, and facilities are <br /> near anticipated life of mine (LOM) buildout. This reclamation cost estimate update for Henderson <br /> continues to utilize all existing and anticipated new disturbances through the life of mine (LOM) as its <br /> basis, and includes water management and treatment. <br /> The Henderson reclamation cost estimate includes the following key elements which have been <br /> evaluated for this update: <br /> • LOM site conditions. <br /> • Repurposed facilities, as approved previously by DRMS, remain unchanged as listed in Section <br /> 3.2. <br /> • Current reclamation approaches have changed little for several facilities including access roads <br /> and reservoirs, utilities and utility corridors, yards and storage areas, and the demolition of <br /> buildings and superstructures. <br /> • Significant updates have been applied to the closure approaches for the Tailing Deposition Area <br /> (TDA) and for long-term water management and treatment in both the underground mine and at <br /> the Mill site. <br /> • Updated unit rates, production calculations and correction factors using past Henderson Mine and <br /> Mill project experience, specific industry quotes, EquipmentWatch (2019), the Caterpillar <br /> Handbook(2018)and RS Means (2019). <br /> 1 Dec 2019 <br />