2021-12-07_REVISION - M2012032 (25)

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Table D-3- Surface Mine Equipment List Surface Equipment Number Compactor Cat CS-433E Vib Single Drum 1 Dozer Cat D5 K2 LG P 1 Compressors Ingersoll Rand EP 200 200HP 1 Ingersoll Rand EPE 250 250HP 1 Ingersoll Rand EPE 300 300HP 1 Notes: (a)Miscellaneous rental and contract equipment will be brought to the mine site as needed.These could include fuel trucks,propane trucks,boom trucks,maintenance vehicles including welders,pipe equipment,electrical man lifts for working on power lines,contract vent hole drilling equipment,exploration drilling equipment,material delivery trucks,and concrete and gravel trucks. 5.2 Waste Rock and Tailings Management The previous waste rock embankment at the Revenue Mine was made from waste rock generated from underground development in the past.No reclamation of this waste rock embankment has taken place. Approximately 25,000 to 35,000 CY of waste rock exists in this pile. See Map C-1 for the location of this area. This rock has some minor vegetation growing from the surface,but it has not been vegetated in over 100 years. Tailings produced by the underground mill are transported to the TSFs via truck from the loadout facility shown on Map C-la. The ore sent to the mill comes from a roughly 1.5 foot thick ore vein(quartz hosting the sulfides)and is processed through a flotation system designed to remove >95 of sulfide minerals. The resulting tailings from this process are - 130 mesh and have a moisture content of between 13%and 18%. The mill process is designed to remove the sulfide minerals from the ore, and therefore will produce tailings that are not expected to be acid generating. To accommodate the new mining at the Revenue Mine,two TSFs will be used over the life of the mine. The first TSF,the Revenue TSF is located on top of the existing waste rock embankment. The second TSF,the Atlas TSF is located to the west of the current mining area and is being constructed on ground that was previously disturbed by the Atlas Mine. Map C-la shows the final maximum extent of the two TSFs. These two embankments have a combined capacity of approximately 1,000,000 tons. This volume is expected to provide approximately 10.0 years of storage under the assumption that waste rock brought to the surface remains on site. If large amounts of waste rock are removed(i.e., shipped offsite as road base and construction materials),the life of the TSFs could be extended beyond 15 years. Approximately 80,000 tons of fine mill tailings and 20,000 tons of waste rock are planned to be produced on an annual basis. It is planned that some,if not all, of the waste rock will be processed by crusher and either be given to Ouray County or sold to customers,as demand for road base dictates. For the purposes of this plan, it is assumed that no waste rock is removed from the site and must be spread out in lifts and compacted in the two TSFs. Waste rock content of the TSFs will be limited to 15%of the material placed in per lift. This will help to ensure sufficient compaction of tailings is achieved. A large portion of the Revenue TSF is located in an active avalanche path. The avalanche path is shown on Map C-la. Due to the avalanche threat,grading and compaction of the lifts on the Revenue TSF is Revenue Mine Amendment 02 D-14 December 2021