Laserfiche WebLink
Chavers Mining Resource <br /> DRMS Permit No.M-2015-030 <br /> Amendment No.2(AM-02) <br /> January 2024 <br /> Page 4 <br /> ■ Industrial Well: In addition to sand and gravel pit mining, a concrete production plant is <br /> located at the Site. The concrete production plant utilizes groundwater from the on-site <br /> industrial alluvial well (Well Permit No. 80120-F) located near the southeast corner of <br /> the Site. <br /> ASCI maintains replacement water lease(s) and approved Substitute Water Supply Plan (SWSP) <br /> through the Division of Water Resources(DWR)annually to account for out-of-priority depletions <br /> resulting from the water diversions and impoundments. <br /> 6.4.4 (D) SIZE OF AREA(S) TO BE WORKED ON AT ANY ONE TIME <br /> The maximum size of pit areas to be worked on at any one-time is approximately 20 acres. The <br /> average depth of the pit across the Site is approximately 28—32 feet below ground surface. <br /> 6.4.4 (E) APPROXIMATE TIMETABLE FOR MINING OPERATION <br /> Approximately 75 of the 87 acres of affected area at the Chavers Mining Resource are mineable. <br /> Of the 75 mineable acres, approximately 50 acres have been or is currently being mined. The <br /> mining operation is estimated to last for another 6 to 8 years; however,this could vary depending <br /> upon market conditions. Up to 20 acres may be exposed at one-time for concurrent mining and <br /> backfilling operations. As shown on Exhibit C-2, current mining excavations within 400 feet of <br /> the South Platte River will be backfilled to pre-mining elevation within one (1) year of approval <br /> of AM-02. Future mining excavations within 400 feet of the South Platte River will be backfilled <br /> to pre-mining elevations within one (1)year of excavation. <br /> 6.4.4 (F) STRATIGRAPHY <br /> 6.4.4 (F)(1) Nature of Deposit <br /> The average overburden thickness is approximately 3.5 to 4.0 ft. The topsoil portion of the <br /> overburden typically ranges from 12 to 24-inches in depth. The sand and gravel deposit varies in <br /> thickness,but the average thickness is approximately 28 feet. It varies from sandy lean clay in the <br /> upper zones,to coarse clayey sand and sand with gravel nearer the bedrock. The gravel typically <br /> found in this area has a history for being processed into high-quality aggregate construction <br /> materials including concrete and asphalt. <br /> 6.4.4 (F)(ii) Nature of Stratum beneath Deposit <br /> The strata underlying the sand and gravel deposit is a claystone bedrock. <br /> 6.4.4 (G) COMMODITIES MINEDIEXTRACTED AND INTENDED USE <br /> The primary commodity is sand and gravel to be used for the construction industry. <br />