2019-06-28_REVISION - M1977004 (9)

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Homestake Mining Company May 10,2019 Regular(112d)Operation Reclamation Permit Application Package layer of most areas to be seeded, drill seeding will likely not be widely employed.) Seeding rates with these methods of application are shown on Tables 4-1. Slopes at 3H:1 V or steeper will be hydroseeded or broadcast at the appropriate rates, as shown on Table 4-1. Table 4-1. Alpine seed mix. Variety Common name Scientific name PLS Ibslac Slender wheatgrass Elymus trachycaulus 7.5 Smooth brome Bromus inermis 3.0 Western wheatgrass Pascopyrum smithii 2.2 Cicer milkvetch* Astragalus cicer 1.1 Potomac Orchardgrass Dactylis glomerate 0.7 Timothy Phleum pretense 0.5 Total Pounds Pis/Acre 15.0 Notes: 1. Seeding rates given above are for pounds of pure live seed per acre,applied by drilling. 2. Seeding rates for broadcasting are twice(2x)the rates shown above. 3. Seeding rates for hydroseeding are four times(4x)the rates shown above. 4. *These legume seeds will be inoculated with proper strain of Rhizobium. Species in the seed mixes are high-alpine, cool-season species. Given the seasonal precipitation pattern and short growing season, HMC plans to apply seed in the fall, before the ground is frozen but late enough that germination will not occur before winter. All seeded areas will be fertilized at or before the time of seeding. Supplemental nitrogen fertilizer will be applied as a top dressing at a rate of 30 to 60 elemental pounds per acres, around one to three years after initial establishment if plants appear to be nitrogen deficient. (Note that legume species are included in both seed mixes, which are valuable for fixing nitrogen in the root zone.) Fertilizers with specifications of 20-20-10, 18-25-12, and 18-46-0 of nitrogen, phosphorus, and potassium (NPK) have been used successfully at the site, at application rates of 200 to 300 bulk pounds per acre. Site-specific analyses of growth media may indicate the need for applications of the fertilizer formulations shown above, or other formulations and/or rates. Ongoing fertilizer applications of single areas are not beneficial in this type of setting and are not proposed. Areas seeded to grass will be mulched to minimize erosion and add organic matter to aid in plant establishment. Steeper slopes which are hydroseeded will be hydromulched (typically a wood fiber or straw material) at a rate of 1,400 to 2,000 pounds per acre. Tackifiers may be used as deemed necessary by site-specific conditions. Flatter areas that can be traversed by equipment and were seeded by broadcasting or drilling will be mulched with 1 to 2 tons of straw per acre and crimped or disced into the soil. Where it is impractical to crimp or disc the mulch that has been spread, a tackifier may be used. The seed areas will be monitoring and reseeded as necessary to provide timely and adequate revegetation. Revegetation will generally be carried out on all areas not consisting of roadways, EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 65 HOMESTAKE MINING COMPANY