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Valco T Pit Las Animas County Valco Inc. Exhibit D • Mining Plan The Process Area, north of the Pit Area, has been mined many years ago and now exists as a relatively flat surface at the 6000' contour. Processing operations with material stockpiles will be maintained in this area. Mining is proposed to be conducted in a single phase. Mining will begin at north end and proceed south to completion of extraction. The Pit Area will be mined by removing the top of the plateau down to approximately the 6020' contour leaving a berm along the western boundary of the Pit Area connecting with a berm across the southern boundary of the Pit Area. The deposit ranges from 10' to 30" in depth capped with 0" to 10" of overburden and topsoil. Projected business demand suggests that approximately 1'/x acres per year will be mined. Topsoil and overburden will be removed in increments large enough to allow for 2 to 3 years mining. The topsoil and overburden will be segregated and preserved for reclamation. Overburden will be used in conjunction with the rejected fine material from the crushing and screening operation to shape the berms to at least a 2 tot slope, approximating the natural western slope of the Pit Area. At the conclusion of mining, remaining rejected fines and excess overburden, if any, will spread evenly over the surface of the Pit Area as an underlayment to the topsoil which will then be spread in an even layer • over the entire disturbed area, which will then be be revegetated. Aggregate will be extracted from the Pit Area by wheel loader, excavator, or similar equipment and transported for processing, in the Process Area. In this area, the material will be crushed, screened, and stockpiled. The screening will be dry or possibly wet utilizing a closed circuit sealed system and hauled water from Trinidad. Rejected fines will be stockpiled for use in reclamation. Silt fences of 24" or greater will maintained around the Pit Area and Process Area on the east side according to the Stormwater Discharge Plan which will contain any accumulation of Stormwater on the top of this plateau, forcing percolation and filtering of silt. Haul will utilize an existing ranch road so no roads will be built. The Fugitive Dust control plan calls for inert chemicals, possibly magnesium chloride, to be applied to this road as required to suppress dust from the hauling process. No dewatering is projected so no NPDES permit is required. The pit does not affect wetlands so no 404 Corps of Engineers Permit is required. The proposed timetable is based on the best estimate of business projections at this time. Increased or decreased demand could result in a substantial change to • this timetable.