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~'~~ .. <br />.. . <br />i <br /> III III III IIIIIII III <br /> 999 <br />No. 5 Mine Inflow Report JUL 3 01g~~ <br />~ , i, ` , • ., 5.. . <br />1.1 Introduction ,,: ,,,.., .. ,.:.,.. <br />Permit No. C-044-81 issued October 19, 1983 requires Empire Energy to <br />conduct an annual mine inflow study. TF~is requirement is set forth in <br />stipulation 3 of the above permit. The following is submitted to satisfy <br />this requirement. <br />1.2 Geologic Setting <br />The No. 5 Mine operates in the F seam within the lower coal group of the <br />Williams Fork formation. The nearest important aquifers are the overlying <br />Middle Sandstone and the underlying Trout Creek Sandstone. <br />The Middle Sandstone consists of a complex assemblage of sandstone and <br />sandy shales that exhibit a generally coarsening upward nature. The unit <br />is interpreted as a marginal marine sandstone "barrier and/or distributary <br />mouth sediments". It is underlain by a significant impermeable shale, <br />ranging from 15 to 30 feet thick, which is in turn underlain by <br />irregularly distributed continental deposits such as interdistributary <br />bayfills (ranging from shales to sandstones), fining-upward point bar type <br />sandstones and coals. The Middle Sandstone lies from 60 to 150 feet above <br />the F seam. <br />The Trout Creek Sandstone (Iles formation) underlies the F seam by about <br />350 feet. It averages about 75 feet thick and it too is interpreted as a <br />marginal marine sandstone. The intervening strata consist of coals, <br />shales and sandy shales, with only occasional sandstone. <br />1.3 Prior Studies <br />Prior mine inflow studies have been conducted in 19!33, 1984 and 1985. <br />During the 1983 studies, mining occurred in both the eastern and western <br />portions of the mine. During 1984 the majority of mining occurred in the <br />eastern portion of the mine. During 1985 and 1986, all of the mining <br />activity is contained in the eastern part of the mine, and the primary <br />mining method has changed from room and pillar to longwall. <br />The results of the 1983 inflow study are provided in Table 1. The reader <br />is referred to that study and its associated map for location of the <br />sampling sites. <br />Table 1 - 1983 Mine Inflow Study Results <br />Location Index No. Inflow (gpm) <br />West of Faults 8 8 <br />Fault 6, 4 363 <br />1 Left Panel 3 30 <br />3 South 2 ~~_ <br />Central Works 15 6 <br />-1- <br />