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Permit M-1977-493—Climax Mine Technical Revision 37 (TR-37) <br /> E-6.1.4 Temporary Reclamation Cover Stockpiles <br /> In limited situations, reclamation cover materials may be temporarily stockpiled or windrowed near active <br /> operations rather than placed in permanent stockpiles. These situations would occur when the salvaged <br /> reclamation cover is needed for current reclamation, but the area is not immediately ready for soil to be respread. <br /> Temporary reclamation cover stockpiles will be seeded with the temporary seed mix as soon as possible after <br /> stockpile construction and clearly identified with appropriate signs. <br /> E-6.2 Reclamation Cover Placement <br /> There will be a nominal depth of 24 inches of reclamation cover material placed on areas designated for final <br /> reclamation. For approximately 3% of the TSF reclaimed surfaced offset 200 feet from the dam crests, the cover <br /> material thickness will be 48 inches to promote tree growth. Placed reclamation cover material may be ripped to <br /> reduce compaction prior to revegetation. Seeding will follow the application of soil during the first appropriate <br /> season. Detailed discussion of OSF and TSF reclamation is included in Section E-11. <br /> E-6.3 Soil Amendments <br /> Climax has applied biosolids to previously reclaimed areas under a permit issued by the United States <br /> Environmental Protection Agency (USEPA) and the Colorado Department of Public Health and Environment <br /> (CDPHE). Although the use of biosolids has successfully enhanced revegetation, Climax will no longer be using <br /> biosolids due to concerns with potential fluorinated compounds in the sources and will be officially discontinuing <br /> their use in 2024. Soil amendments other than, or in addition to, reclamation cover are sometimes required for <br /> successful reclamation at Climax. The need for other amendments will be determined from soil analyses and/or <br /> reclamation site characteristics on a site-by-site basis. <br /> E-6.3.1 Soil Analysis <br /> Prior to application of reclamation cover, materials may be sampled and analyzed. Cover materials that could be <br /> tested include pit overburden and salvaged reclamation cover soils. Soil analyses may include, but are not limited <br /> to, acid potential, neutralization potential, organic matter, nutrients (nitrogen, phosphorous and potassium), and <br /> texture. These analyses will be used to determine the need for lime and/or fertilizer additions. <br /> E-6.3.2 Fertilizer <br /> Fertilizer is generally not necessary and could be detrimental on areas reclaimed with reclamation cover. <br /> However, areas that are not reclaimed with topsoil may require an application of fertilizer for revegetation <br /> success. Products that contain organic matter as well as nutrients are preferable to chemical fertilizers. In <br /> addition, depending upon the time of year that the area will be reclaimed, a slow-release nitrogen product may be <br /> used for better revegetation success. The fertilizers can be applied with a spreader or hydromulcher. When <br /> applied without water, the fertilizer may be incorporated to avoid chemically burning the vegetation. After the <br /> application and incorporation of fertilizer, seeding will closely follow. For cost estimation, all areas will receive <br /> fertilizer except bonded and released areas. <br /> E-7 Revegetation <br /> Revegetation at Climax has included seeding with various seed mixtures, as well as direct transplanting of trees, <br /> shrubs, and herbaceous vegetation. The following sections detail the different revegetation techniques. <br /> E-7.1 Seeding <br /> Reclamation areas, with the exception of talus, will generally be seeded as a part of revegetation efforts. One of <br /> several seed mixtures will be used depending on the characteristics of the reclamation area: <br /> ■ Reclamation areas that will be disturbed within five years of initial seeding may be stabilized with a temporary <br /> seed mixture (Section E-7.1.1). <br /> ■ Reclamation areas above the tree line will be seeded with an alpine seed mixture (Section E-7.1.3). <br /> ■ Reclamation areas with potential hydric soils or saturated soil conditions may be seeded with a hydric seed <br /> mixture (Section E-7.1.4). <br /> Exhibit E E-5 March 2024 <br />