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Figure 3 is a cross-section through the mine workings. As shown here and in Figure 2, ground <br />water expresses itself (- 20 gal/minute) in the Inclined Shaft at the A Groove level, above the <br />Mahogany zone, and is routed down that shaft and into the Crosscut tunnel, from which it <br />follows a shallow channel along the North Drift and out onto the Mine Bench. <br />Shafts approximately <br />12' high, 25' wide <br />Entries - 135' apart <br />center to center <br />Entries extend -225' <br />ZB.n.h Into Mahogany Zone <br />Rub Wat upper and <br />of in dined hfl <br />1-55 <br />0 <br />Mahogany Face hogany) <br />B eak t draedne, <br />- - - ? - nd.n.rt <br />Mine Bench <br />w.arnowlnehaR Inclined Shaft <br />arldna-at and lextends b.-athmine Wnch) <br />bwe A Groow. <br />Lower part of Inclined 9 Dlwrted Into main <br />shaft flattens and appears entry to Batt waklrga <br />to be In mine bench fill -60 g• <br />worth n mreetad ool and I <br />M 00 Ft <br />e to suppo1 <br />Approximately, 241nch wnaia/bn pipe Entry Heights Not to Scale <br />heading toward micro bench sudees. <br />Figure 3. Cross-section view (looking south) of mine entries. <br />ELECTROFRAC" CONSTRUCTION TEST (TR-11) <br />ExxonMobil conducted the ElectrofracTM Construction Test under TR-11 at the Mine Bench site. <br />ExxonMobil built two ElectrofracTM hydraulic fractures: EFI. and EF3. As shown in Figure 4, <br />the borehole for EF 1 penetrates the south mine pillar from the North Drift and the borehole for <br />EF3 penetrates the north mine pillar from the Crosscut tunnel. The EF1 and EF3 boreholes were <br />cased and cemented, except for short open sections at the end of each hole that were used for the <br />fracturing jobs. A slurry of electrically conductive material (calcined coke, Portland cement, and <br />water) was injected into each of the hydraulic fractures. <br />6 <br />#1445022 v1 den