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Spider's Aggregate May 9, 1985 Page 2 b.) Production of Fines: Curr approximate amount of 15Y gradation of these fines i tally for use as bedding a jects. Currently there is on past experience, it is will not exceed 10,000 to hornblende gneiss, talc-silicate gneiss, and garnetiferous and silli- manitic varieties. Characteristically gray, brownish-gray, or pinkish- tan medium-to-fine-grained well-foliated and well-layered rock. Compositional banding generally is parallel to foliation and ranges in thickness from a fraction of an inch to several tens of feet. Variably migmatitic; salmon-pink to white stringers, veinlets, or small tabular masses of quartz-plagioclase-microcline-biotite pegmatite ~:haracteris- tically cut the gneiss or occur as subconformable layers. The associa- tion of the sillimanite-microcline pair in rocks of appropriate composi- tion indicates that the high-grade metamorphism reached the uppermost part of the amphibolite metamorphic facies. Late poikilob~lastic musco- vite indicates local retrograde metamorphism. Unit interpreted as formed from a sedimentary and volcanic sequence principall~~ containing rhyodacitic to intermediate flows and tuffs, together with sedimentary interlayers containing volcanic detritus mixed with other elastic debris." Compositional banding and stringer planes strike generally North-South, dipping Easterly at approximately 75°. This orientation his allowed numerous naturally occurring rock faces in the immediate area that approximate a 0.25:1 slope. These natural faces are found to be in ex- cess of 80 feet high in some cases. Quarry operations at this site have revealed that 0.25:1 slopes in this material are stable. This amendment proposes that cut-sloEres remain at 0.25:1 and that bench width be increased to 20 feet from the original 10 foot width. Stability of the material, as indicated by ob~;ervation of cut-slopes formed by quarry operations, indicate that the ~~ertical inter- val of benches can be increased from 20 feet to the proposE~d 40 feet with no detrimental effects on general stability. It is fE~lt that the 20 foot width of the proposed benches will allow more room for equipment to operate to construct such benches and will allow additional room for application of the proposed reclamation methods. • ent production methods produce fines in the to 20q of the total material processed. The s 1/2" and smaller. These fines are sold lo- / nd base material for various con~:truction pro- a backlog of orders for this material. Based estimated that stockpile volumes of these fines 20,000 tons. c.) Blasting, Structural Damage: Two structures are presently located 1000 feet of present and proposed blasting operations, 1.) Rencher Concrete Products, a concrete block manufacturing plant (600 feet) 2.) City of Canon City's Domestic Water Treatment Plant 0300 feet) structural damage has been reported by personnel of either of these lities. within and . No faci-