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Minerals <br />Locatable Minerals <br />• Saleable Minerals <br />Range-Domestic Livestock <br />Visual <br />Floodplains and Wetlands <br />Wilderness and Special Designations <br />Recreation <br />introduction <br />One of the areas of potential impact to other resources is subsidence <br />caused by caving behind the longwall panels in the mine operation. <br />Subsidence may reach the surface with maximum subsidence being projected <br />to be 5 feet. Zn addition to the area directly above their workings sub- <br />siding, Western Fuels-Utah Inc. predicts subsidence impacts to surrounding <br />areas that Lie within a 35 degree angle of draw. <br />Longwell mining will produce the most subsidence, but the subsidence will <br />be (relatively) short-lived, lasting less than 5 years after mining. Room <br />and pillar mining will minimize initial surface subsidence during room <br />advances and Lower the surface an almost undetectable 0.025 feet or less. <br />Ninety-five to 98 percent of the subsidence resulting from longwall mining <br />occurs during active mining. The remaining residual subsidence, 2 to 5 <br />percent of the total, has been monitored for up to 4-1/2 years after ces- <br />sation of mining. <br />• The following resources will be impacted from actions associated with the <br />proposed action: <br />Minerals <br />Coal <br />Approximately 344 acres would be removed from the Prairie Dog Lease <br />Tract. This would decrease the Prairie Dog Tract from 11,517 acres <br />to 11,173 acres. Approximately 2.1 million tons of coal would be <br />removed reducing the estimated coal reserves within the Prairie Dog <br />Tract Erom 44 million tons down to 41.9 million tone. This would be <br />equivalent to approximately 2 years of annual production from the <br />existing mine. <br />In addition to the coal removed from the bypass lease area, an addi- <br />tional .3 million tons of coal reserve in lease C-023703 would also <br />be removed from the buffer area. <br />011 and Gas <br />Oil and gas production could not be impacted by the development of <br />the tract for coal. The granting of a lease for the production of <br />coal deposits shall preclude neither the issuance of prospecting per- <br />. mica or mineral leases for prospecting, development, or production of <br />15 <br />i <br />