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Narrative for the Dowe Flats Quarry Year ]0 Interim Review <br />Page 2 of 3 <br />change of ownership of some of the land within the original Dowe Flats Quarry <br />permit boundary. <br />3. Annual mining and reclamation reports submitted to the Colorado Mined Land <br />Reclamation Boazd. <br />4. Cultural Resource Monitoring Reports. <br />S. Wetlands Report. <br />6. On-site Wind Data Monitoring Reports. <br />Background Information <br />The Dowe Flats quarry is an open pit mine covering approximately 385 acres. The <br />quarry is located within an original permit boundary of approximately 1,955 acres. The <br />additional 1,570 acres within the original permit boundary is for buffer and setback from <br />the 385 acre quarry. <br />Within the quarry four different bedrock horizons are tazgeted for mining based upon <br />[heir utilization potential at Cemex's nearby cement plan[. From west to east, the first <br />three pits have some overlap. The fourth pit (nearest County Road 47) is a separate <br />shallow pit. Mining of the respective pits began at the south end of the quarry, and <br />proceeds to the north. Much of the excavated material is "overburden", which is <br />stockpiled for later use, or backfilled in a previously mined portion of the quarry. <br />Overburden includes: <br />1. Topsoil, which is stripped and either stockpiled or used immediately for reclamation. <br />2. Clay, found in beds several feet thick, located between the topsoil horizon and <br />bedrock. Clay is stripped and typically placed in temporary stockpiles and later <br />backfilled prior to final reclamation of a given site. <br />3. Waste rock, blasted and backfilled into open mine pits. <br />Tazgeted materials in the four pits used for cement manufacture aze limestone and shale. <br />This material is hauled to an on-site, covered crusher and transported by conveyor to the <br />cement plant south of Colorado Highway 66. <br />During the opening of the quarry, there was no open mine pit to backfill the waste rock, <br />and a waste rock stockpile was created at [he south end of the quarry north of County <br />Road 47. Much of the this stockpile may be used in the future to backfill mine pits. <br />Equipment typically used for mine operations includes a drill rig (to drill blast holes), <br />front end loaders, and 85 ton haul trucks. Dozers aze used in backfilling and reclamation. <br />Water trucks are used to water quarry roads. <br />