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3. Explosives and Blasting <br />Various types of explosives have been used at the Revenue Mine and depending on the location <br />can consist of dynamite (stick power), Anfo (ammonium nitrate), or some combination of the <br />two. Detonators are fuse primers, nonels, or electric blasting caps. All explosives will be stored <br />underground at two locations in the Yellow Rose drift, as shown on Map C -5. All explosives will <br />be stored and handled according to MSHA regulations. <br />4. Ore Processing Mill <br />The raw ore produced by mining at the Revenue will be processed in a 100% underground <br />milling facility designed by CH2M Hill. The details of the design can be found in Appendix 7. <br />Exhibit T also focuses on the environmental protections to be employed in the mill process. Raw <br />ore will be hauled underground to the storage bins shown in the mill design, and then run <br />through a primary crushing circuit. From there it will be conveyed to the secondary crushing <br />circuit by a conveyor belt, and from there to a fine ore storage feeder for the ball mill. A ball mill <br />will reduce the ore to very fine size for separation in the flotation circuit. The flotation circuit <br />uses a number of chemicals and frothers to selectively float various sulfide minerals, which will <br />be skimmed from the surface of the cells and rinsed and dewatered. This concentrate will then be <br />bagged in super sacs for transportation off site for sale. This concentrate will contain primarily <br />all sulfides from the ore, producing a concentrate that is —2-10% of the original ore feed mass. <br />The concentrate will be fed to highway haul trucks via the mill portal. <br />Filters will be used to extract water from the tailings, and this water will be recycled in the mill. <br />The tailings will be delivered outside by a 24" wide or smaller rubber conveyor that will be <br />covered from the mill portal as shown on Maps C -2, C -3 and C -4 to a steel building of <br />dimensions 20 feet x 30 feet x 20 feet high. It will have a 6" thick steel reinforced concrete <br />foundation. The tailings material size is approximately 200 mesh and due to the water filter <br />recycling, the water content of the tailings will be approximately 13 -16 %. This building will <br />have a large garage door on the north side. From this opening, a backhoe or other machine will <br />Revenue Mine August 2012 D - <br />