Laserfiche WebLink
1 <br />1 <br />1 <br />1 <br />T830161 <br />Once the: quarry reaches its ultimate depth with a floor elevation of 5,860 feet, a <br />permanent pond approximately ten acres in size will be located in the northeast pit <br />corner. 'J/ater pumped from the pond will be used for various purposes in and around <br />the plant. <br />' Geoloev <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br />1 <br /> <br />Material to be mined as feedstock for the lightweight aggregate processing plant is <br />shale of Cretaceous Age contained in the Pierre Shale Formation. This bedded shale <br />formatior.~ dips an average of 56 degrees toward the east at the quarry site and is <br />interspersed with thin beds of limey sandstone and relatively small concretionary <br />calcareous lenses. The Pierre Formation at this location is approximately 8,000 feet <br />thick. As shown in Figure D.6, the quarry in cross section only penetrates a small <br />fraction of the formation. The shale is generally dark greenish-grey to black in color, <br />is well consolidated, quite soft and contains some 10% inherent moisture. Additionally, <br />the material deteriorates rapidly when exposed to the natural elements, precluding any <br />possibility of maintaining more than a few day's surge between mine and plant. <br />Sufficient reserves are available within the permit area to sustain plant operations for <br />in excess of 30 years. <br />Overlying the Pierre Formation at the Hogan property is 5 to 10 feet of bouldery sand <br />and grave:l containing abundant granite and gneiss. Material in this surface feature, <br />called the: second Coal Creek Berm, is of Quaternary Age, and is strongly weathered. <br />The gravel was deposited by the present drainage system when it was flowing at a <br />higher level. <br />Waste Diss~posal <br />Disposal of solid wastes from the processing plant's lime flue gas scrubbing system will <br />-7- <br /> <br />