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~' EXHIBIT D (Revised 4-28-78) <br />MINING PLAN <br /> <br /> INTkUDUCTIUN <br /> The Cement Division of Ideal Basic Industries, Inc. <br /> operates a cement plant located two miles north of Laporte <br />' in Larimer County, Colorado. The plant started production <br /> <br />' in 1~2FS, utilizing raw materials from the Niobrara limestone <br /> outcrop in the area. <br /> A brief' description of the limestone formation will <br /> provide a better understanding of the mining plan. Tie Niobrara <br /> formation evolved as the bed of an ancient ocean that was <br /> ]a ter tilted upward about 15 degrees from the horizon .al <br /> <br /> toward the west. The limestone layers were then expo:;ed by <br />' erosion to form a prominent north-south trending hogback <br /> ridge. <br />The lower, more dense limestone layer (A-Band) outcrop <br /> form; the highest point of the ridge or hogback. Due to the <br />' <br /> 15 degree dip, the upper limestone an d shale layers outcrop <br />1 en ,:i, of the hogbnek (see the typical cross-section sketch on <br /> the next page). Exhibit B also shows a columnar section of <br />' Pnrmai,ions I'or t]"re gener al area. The several limeston= <br /> layers have been designated as bands A (bottom} througa G <br /> <br /> (top) and total about 300 feet in thickness. The limestone <br /> bands vary in chemical quality, argillaceous materials and <br /> kerogen content which, with the dip, make the mining p"an <br /> quite nom}~le:t. <br />