Laserfiche WebLink
5.0 EXHIBIT D- MINING PLAN <br /> 5.1 General <br /> The amended Morton Lakes Sand and Gravel pit is anticipated to affect approximately 312 <br /> acres of land . <br /> The aggregate deposit consists of alluvial sand and gravel overlain by topsoil and <br /> overburden. The topsoil layer and overburden layer will range from three to five feet in <br /> thickness, while the sand and gravel deposit is 25 to 30 feet thick. The deposit is underlain by <br /> bedrock shale. The maximum depth of excavation will be approximately 35 feet. <br /> The alluvial groundwater level are approximately 3 to 5 feet below natural ground level. <br /> The deposit is therefore classified as a wet alluvial deposit. However, the sand and gravel deposit <br /> will be mined dry once the each mining stage has been de-watered. The sand and gravel deposit <br /> is cataloged in the report Sand, Gravel and Quarry Resources, Colorado Front Range Counties <br /> (Colorado Geologic Survey, 1974). <br /> An estimate of overburden and sand and gravel reserves for the combined properties is as <br /> follows: (gravel calculated at 62,500 tons per acre) <br /> Mining Stages Acres Sand and Gravel Overburden <br /> Stage 1 16.9 1,000,000 tons 85,000 yds <br /> Stage 2 19.2 1,200,000 tons 105,000 yds <br /> Stage 3 17.0 1,070,000 tons 110,000 yds <br /> Stage 4 69.0 4,300,000 tons 400,000 yds <br /> Stage 5 60.0 3,750,000 tons 350,000 yds <br /> Stage 6 83.0 5,200,000 tons 500,000 yds <br /> Stage 7 40.0 2,300,000 tons 210,000 yds <br /> 5.2 Mining Method <br /> Dry mining techniques will be used. Initially, a dewatering ditch will be excavated around <br /> the perimeter of each mining stage and groundwater recovered in the dewatering ditch will be <br /> 4 <br />