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State of Colorado Department of Natural Resources October 12, 1976 Page Two (2-c) Owner of Sub-surface Rights: State of Colorado State Board of Land Commissioners Lessee: DFC Ceramics, Inc. (2-d) Map of Location and Area: Attached. The 10-acre mining area is entirely within the 148-acre quarter section leased by DFC Ceramics, Inc. fron the State of Colorado. (2-e) Approximate Size of Affected Land: A total of 10 acres, with actual mining to be done on only a small portion of this, probably 2 or 3 acres. (2-f) Type of Mining Operations: The principal operation is the extraction of about 250 tons per year of a siliceous clay lying about 2 to 3 feet behind (west) of the steeply sloping hard sandstone faces now exposed on the east side of the Golden Hogback. The outer rock face is blasted and pushed away, and the clay behind is then blasted to a depth of 3 to 5 feet and loaded out with a front-end loader. The depth of mining is set by the thickness of the clay over a second hard sandstone layer behind it. Actual operations take a few weeks each year or two and the area mined is about 600 to 800 square feet of face per year. No new land is being stripped as the faces being mined have been exposed for 30 to 40 years. An additional very small operation has been carried on to extract a thin (about 3 to 4 feet thick) bed of plastic clay lying about 20 to 30 feet east of the exposed sandstone faces, and having the same steep dip of these faces. Only about 20 to 30 tons per year of this clay is being mined. Extraction is done by opening a short horizontal tunnel about 15 to 20 feet long at a point about 100 feet below the exp~~sed sandstone faces. This tunnel intersects the plastic clay rein, and a shrinkage stope is then driven upward toward the surface, finally reaching the surface at a point on the edge of the bench in front of the old exposed sandstone faces. When extraction is