2019-08-29_PERMIT FILE - M2019028 (3)

Home Browse Search

Affected Acreage Mining Plan Area acres Mined Area 189.60 Access Roads 21.56 Disturbed Land 16.36 TOTAL 227.52 Various setbacks from adjacent roads, adjacent structures, and oil and gas infrastructure will be maintained as mining occurs. All setbacks specified in the surface use agreements with the oil/gas companies will be followed. The final executed agreements are expected to be obtained in the near future and will be forwarded to the Division when they are available. A minimum 200 foot setback from any existing oil/gas facility will be maintained until that time. See Exhibit C, Mining Plan Map, and the Slope Stability Report for the mining limit configuration and information on setbacks and their locations. Products Sand and gravel will be the primary product produced from the DPG Mining site. The principal intended use for the sand and gravel is for road base and construction aggregates. Subsurface drilling and testing have verified that the DPG Mining site property contains a significant commercial deposit of sand and gravel. The depth of interbedded sandy clays and clayey to silty sands at the surface range from 3 to 12 feet. The thickness of the aggregate material ranges from 67 to 102 feet where bedrock contact occurs. Mining Methods The deposit will be dry mined and a slurry wall will be constructed around the perimeter of the mining area for Phase 1. Phase 2, 3, 4, and 5 will not be opened until the slurry wall is constructed around each phase prior to mining each phase. Design specifications for the slurry wall and quality control procedures used during construction will ensure that the reclaimed reservoir meets State Engineer's Office (SEO) performance standards. Dewatering trenches will be excavated around the perimeter of each mining area in Phases 1 — 5 prior to mining operations commencing. The depth of the ditches will vary as the mining progresses deeper into the alluvium in order to maintain the groundwater level below the active mining bottom surface, and therefore minimize the exposed groundwater surface area. The dewatering ditches will flow to a collection pond, from which the water will be pumped into a ditch, which traverses the mining phases and eventually discharged into the Cache La Poudre River. The equipment and facilities may include, but are not limited to the following: Processing Equipment Screens, crusher, conveyors, stackers, and other miscellaneous processing equipment. Earth Moving Equipment Dozers, loaders, scrapers, excavators, and compactors will be used for mining and earth moving operations. • JET Consulting,Inc. J-2 Contracting Company �' DPG Mining Site DRMS 112 Permit Application