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<br />glass, chemicals, pulp and paper, soaps, detergents, water treatment products, cleaning <br />preparations, and other products (Lewis 1992). <br />D.10.2 Other Commodities Present <br />Through January 1990, a total of 204,410 barrels of oil and 235,865,770 MCF of natural <br />gas were produced within the Piceance Creek Basin. Gas production is generally from <br />small subparallel northwest trending folds, the most prominent of which is the Piceance <br />Creek anticline. The federal government has leased 100 percent of the oil and gas <br />mineral estate underlying American Soda's sodium lease tracts. With the exception of <br />Duck Creek Fed 1603, which produces a high paraffin crude during the summer months <br />only, no producing oil or gas wells exist on American Soda's lease block. Coal bed <br />methane reserves in the Piceance Creek Basin approach 84,000 million cubic feet (MCF). <br />The Piceance Creek Basin contains rich deposits ofkerogen-bearing dolomitic marlstone <br />(oil shale) of the Eocene Green River Formation. The estimated total reserves of the <br />Piceance Creek Basin amount to approximately 1,200 billion barrels of shale oil (Robson <br />and Sauliner 1980). The Mahogany Zone, which is 100 to 200 feet thick, consists of <br />kerogen-rich strata and is the richest oil shale interval in the basin. The upper 40 to 60 <br />feet of the Mahogany Zone could be suitable for conventional room and pillar oil shale <br />mining. Estimated in place resources within this interval are approximately 94,000 <br />barrels per acre of shale oil. The Parachute Creek Member contains most of the oil shale <br />and ranges in thickness from 900 to 1,200 feet on the southern and western margins of <br />the basin to nearly 1,900 feet in the depositional center. Estimated in-place resources <br />within the Saline Zone of the Parachute Creek Member are approximately 1,500,000 <br />barrels per acre of shale oil (BLM 1986). The Upper Garden Gulch Member also <br />contains some kerogen-bearing rock. <br />Limited amounts of salable minerals are available within the Piceance Site. These <br />include sand, gravel, and sandstone. The sand and gravel are found in Quaternary <br />alluvial deposits, and the sandstone is from the Tertiary Uinta Formation. This material <br />is used for road construction and maintenance in this region. There are no known <br />leases for sand and gravel or sandstone at the Piceance Site. <br />D.11 Incidental Products to be Mined <br />No incidental products are planned to be mined in the Yankee Gulch Project. Some <br />methane gas may be produced and is anticipated to be vented at each well head. <br />D-18 <br />