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<br />EXHIBIT D - Mining Plan <br />The clay mining at the Dawson State Lease started at the north <br />end of the affected area and is progressing in a southern direction. <br />One to two acre acreas are mined at a time in strips 200-300 feet long <br />running in an east-west direction. <br />Plature and Occurrence of the Deposit <br />The clay is a light gray plastic variety forming the lower part <br />of a hill and a large part of the plain. The clay is overlain by six to <br />eight feet of coal ash. The coal ash in turn in overlain by a bed of <br />naturally calcined clay from five to sixty feet thick, followed by a layer <br />of thin sandy topsoil a few inches thick at most. The clay is mined from <br />the top of the bed to a distance of fifteen feet in depth. The clay con- <br />tinues below the mined zone to an undetermined depth. However, the <br />character of the clay becomes sandy with depth and at this time is not of <br />use. <br />Mining <br />Mining is carried out by using the open pit stripping method. <br />• Equipment used is a Caterpillar D-8 and a D-21 yard scraper. Overburden <br />is stripped off the clay and placed on the north end where mining has <br />already begun. This builds the mined area back up and also forms a base <br />for loading the trucks for shipment. After exposing the clay, it is <br />pushed into a stockpile of six to eight thousand tons. This stockpiled <br />clay is then trucked to Denver as the demand requires. Past mining <br />records show that stockpiling is repeated every six to nine months. <br /> <br />