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- Borehole is 8' diameter <br /> - Headframe with a concrete pad of 14'x 19' (minus the 8' diameter borehole plus two 2' x <br /> 2' footers) <br /> - Hoist building has no concrete foundation—it is comprised of two 20' x 8' Connex <br /> containers <br /> - There is a 10'x 10' concrete pad that used to house a winch <br /> - The refuge chamber is comprised of two buried 40' x 8' Connex containers <br /> - There is approximately 50 feet of 8' diameter corrugated steel used to access the buried <br /> refuge chamber. <br /> - Avalanche berm to protect the refuge chamber. <br /> The current permit boundary around the Monongahela/Hubb Reed Raise is 100' x 100'. As part <br /> of this Amendment 02, OSMI is proposing to increase the permit boundary in this area by <br /> approximately 1.16 acres to accommodate the refuge chamber and other surface features that <br /> were inadvertently constructed outside the permit boundary. <br /> The locations of the three ventilation raises are shown on Map C-IA and C-1B. See Map C-1B <br /> for the proposed permit boundary for the Monongahela/Hubb Reed Raise area. The raises will <br /> be installed from within the mine using the same methods as other raises or by raise bore. <br /> Stripping topsoil from these raise areas prior to construction will not be practical as there is very <br /> little topsoil in the area. Should topsoil be encountered at the top of the raises, it will be stored in <br /> a berm around the raise exit to reduce surface water inflows into the mine. A pad will be <br /> constructed at the top of each raise. This pad will be concrete, 10' x 10' square and 12 inches <br /> thick. The raise openings will be up to six feet in diameter. The holes will be cased and grouted <br /> as necessary to prevent water from potential upper fracture systems from entering the mine <br /> workings. <br /> None of the three shafts are located within a debris flow area. The only shaft that is located <br /> within an avalanche path is the 960 Shaft, however, it is located near the top of an avalanche path <br /> and as such we do not anticipate buildup of snow in the area. The 6 feet diameter openings may <br /> capture some snow and rain , however, the amount of meteoric water entering the mine through <br /> these locations is expected to be minimal. <br /> Air is usually supplied to working areas of the mine to provide an adequate volume of fresh air <br /> or to dilute or remove noxious gasses from blasting. This is done using electric powered fans that <br /> bring fresh air from the surface and distribute it using ventilation tubing. Most of the existing and <br /> future entries at the Revenue Mine are in some cases naturally ventilated but as described above, <br /> air currently exits the mine through the existing Monongahela/Hubb Reed raise bore and <br /> eventually will exit at the Yellow Rose Shafts, if constructed. Fugitive emissions venting from <br /> the mine are included in the mine's Air Pollution Emission Notice, which was submitted to the <br /> Air Quality Control Division during the fourth quarter 2021. <br /> Revenue Mine <br /> Amendment 02 D-7 <br /> Updated August 2022 <br />