Laserfiche WebLink
Mayo and Associates, LC <br /> <br />3.3 Genwall -Crandall Canyon Mine (Wasatch Plateau, Utah) <br />In the Genwall Resources Inc. Crandall Canyon # 1 mine coal is extracted from the <br />Hiawatha Seam in the lower Blackhawk Formation (Figure 3). The Hiawatha Seam is <br />separated from the underlying Spring Canyon Member of the Star Point Sandstone by a <br />thin layer (0 -15 feet) of shaley lagoonal deposits (Mayo and Associates, 19976). The <br />Storrs and Panther Members occur 80 and 120 feet below the Spring Canyon Member, <br />respectively. <br />Groundwater enters the Crandall Canyon mine through three pathways (Mayo and <br />Associates, 1997a, b, d): <br />1. roof inflows from sandstone channels in the Blackhawk Formation, <br />d~ <br />IJ <br />~~ <br />~J <br />2, floor seeps, from the Spring Canyon Member of the Star Point Sandstone, and <br />3. fault-related damage zones of the Joes Valley Fault. <br />3.3.1 Sandstone Channel aad Floor Seep Groundwater <br />Most groundwater encountered in the mine issues from sandstone channels in the mine <br />roof, although small quantities of water also issue from the mine floor. Between 1996 <br />and 1998 typical total groundwater inflows were about 500 gpm. Roof dripstypically <br />stop flowing within days to months. Floor water dischazging from the underlying Spring <br />Canyon Member only occurred along [he down dip flank of a gently dipping anticline <br />that is truncated by the Joes Valley Fault system (Figure 10). <br />Evaluation of Potential Groundwater Inflows 37 <br />Associated with E Seam Mining, <br />West Ells Mine, Somerset, Colorado <br />February 24, 2004 <br />