Laserfiche WebLink
EXHIBIT D - Mining Plan <br />a) Mining Schedule <br />It is anticipated that sand and gravel excavation, processing (rock crushing and screening), and stockpiling at the <br />Ashbaugh Expansion site will commence upon receipt of approval from the Colorado Division of Mining and Geology <br />and receipt of other necessary permits. Gravel excavation and processing will be seasonal with stockpiling of gravel for <br />later County uses depending upon the local road repair and construction needs. <br />Generally, the County excavates, crushes, and stockpiles road base materials during each winter on an annual basis for <br />the following summer construction and road maintenance season. Excavation and stockpiling volumes are anticipated to <br />be approximately 100,000 tons or less per year. The Ashbaugh Expansion site likely has only 5 to 7 years of gravel and <br />sand reserves. <br />b) Topsoil thicknesses at the Ashbaugh Expansion site are thin, typically less than 6 (six) inches. Topsoil <br />will be stockpiled at the location shown on the mine plan map (see Exhibit Q. <br />C) The gravel deposits proposed to be mined are stream channel deposits associated with the lower Ogallala <br />Formation found on ridges in the area at the Ashbaugh Expansion site. The gravel deposits are ridge - forming therefore, <br />the thickness of overburden to be removed during gravel extraction is expected to be minimal. Minimal stockpiling of <br />overburden is anticipated. Mined soils unsuitable for construction use will be separated from the mined gravels and may <br />be stockpiled at the site. These soil stockpiles will be utilized for excavation backfill and site reclamation. <br />d) The estimated thickness of gravel- bearing zones varies from between 0 and 25 feet thick at the Ashbaugh <br />Expansion site. No high wall mining is anticipated. <br />e) The enclosed Site Map (Exhibit C) and Mining Plan map (Exhibit D) shows the existing location of the <br />haul road for the old pit. Gravel processing (crusher location), soil and gravel product stockpile areas will be created <br />when the ridge areas are leveled during excavation. <br />f) The dimensions of any significant disturbances are shown on the Mining Plan map as `limit of gravel <br />mining area' and the gravel processing and soil stockpiling areas (see Exhibit D). <br />g) Weld County Road 115 extends north -south along the east edge of the Ashbaugh Expansion site (see <br />Exhibits C and D). The gravel excavation, processing and stockpiling areas will be accessed from that county road. <br />h) There are no irrigation structures or surface water impoundments existing or planned at the Ashbaugh <br />site. Water needs for gravel mining and processing operations are expected to minimal; water for dust control can be <br />obtained and hauled from existing County -owned wells. Water used in mining and crushing operations and for dust <br />control is estimated to not exceed approximately 4000 gallons per month during those operations. <br />i) The existing `old' Ashbaugh gravel pit, located immediately west and adjacent to the Ashbaugh <br />Expansion site does not intersect groundwater; it is anticipated that no groundwater will be encountered at the Ashbaugh <br />Expansion site. When the existing pit does intercept surface water runoff, that runoff eventually infiltrates to the ground <br />water table. <br />The Ashbaugh Expansion site does not lie in a Designated Ground Water basin (per Colorado Division <br />of Water Resources, Office of the State Engineer). <br />MADAVE B\Ashbaugh\DRMS permit\AmendedApplication & Exhibits.doc <br />4/14/2011 <br />