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2019 Reclamation Cost Estimate Update—Henderson Mine& Mill <br /> reclaimed. The corridor for the overland conveyor will be revegetated by the hydroseed method and <br /> plants and trees will be planted across more than 60 acres. <br /> 2.18 Water Management and Treatment <br /> Water management and site-wide water treatment will continue at Henderson after the cessation of <br /> production operations. This cost for water treatment has been updated using a concept for constructing a <br /> long-term downstream water treatment facility in the vicinity of the Ute Park Pump House at the Mill site. <br /> The water treatment facility is anticipated to incorporate a 2-stage high density sludge (HDS) operation, <br /> designed for an inflow rate of approximately 1,200 gpm. Similar to the base assumption for the approved <br /> closure cost for water treatment at URAD, the Henderson Mill treatment basis also covers a 10-year O&M <br /> period for all treatment and pumping systems. The URAD treatment plant O&M costs are associated with <br /> the active Henderson mining operations as well as the pre-1977 mining activities at the historic URAD <br /> mine operation, which account for approximately 40% of average annual flows through the treatment <br /> plant. The estimate also includes capital costs to construct the Mill site water treatment plant, <br /> underground pumping systems to pump from the 7025-7500 Levels and from the 7500-8100 Levels, and <br /> structural bulkheads at two locations (at the West (conveyor) Portal and at the bottom of#4 (Vent) Shaft). <br /> 2.19 Mobilize-Demobilize <br /> Prior reclamation cost estimates included a minimal total cost for total project equipment mobilization and <br /> demobilization. For this cost estimate update, we have assumed annual mobilization and demobilization <br /> lump sum costs based on historic Henderson reclamation projects for a period of 3 years. <br /> 5 Dec 2019 <br />