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I I I I I I I I I I I I I I I I I I I tXnlOll; Inree - l:l"UIUY'~L KefJU"C November 15, 1979 Nicholas Larnpiris, Ph.D. CONSULTING GEOLOGIST PO BOX 10935 ASPEN, COLORADO 81611 (303) 925,6020 Mr, David Burke Project Pl anneI' Professional Design Services, Inc, 1024 Eighth Street Greeley, CO 30631 Dear David: At your request, I have visited the three sites generally south and east of the town of Leadville, Colorado (see accompanying map), which required a geologic evaluation. It is my understanding, that a land use plan will be developed for the gulch areas and a solid waste plan will be developed fOr the site approximately two miles south of the town of Leadville, The larger tract for land use planning encloses the Evans Gulch area from just east of Leadville to about foul' miles east of Leadville, The smaller land use planning tract is southeast of Lead- ville, approximately four miles, and includes the upper reaches of Iowa Gultch, The three tracts lie near the four COrner boundary of the following seven and half minute topographic quadrangle: Leadville North, Leadville South, Climax and 110unt Sherman. The approach will be to discuss each tract separately, beginning vlith the largest tract east of Leadville, for which land use planning is necessa ry, and end i ng with the area contempl ated for soli d waste use south of leadville. The points which you indicated in you letter of October 4, 1979, will be answered as completely as possible; in addition, any geologic hazards which may affect the use of any of the three parcels will be delineated and possible mitigation techniques described. In addition, a small list of perti- nent references which you may Or may not be familiar with will accompany this report. The general geologic setting of the vicinity consists of Paleozoic-age rocks I'a ngi ng from Cambro-Ord i vi ci an 1 imestones and dolomites up through the Mi ssi s- sippiane~n age Leadville Limestone in the eastern portion of the area grading into somewhat younger Paleozoic units such as the Minturn Formation and the Belden Shale. These units have been intruded by Laramide-age igneous rocks consisting of quartz monzonites, granodiorites and quartz diorites, These are dominantly in the fonn of stocks, although dikes and sills do occur, Faulting o~curred nearly contemporaneously with the implacement of the igneous rock and rnineral-heal'ing solutions accolllpanied this event leading to the rich mineral deposits of the Leadville District, In more recent geologic histot',Y <)lacial activity and then fluvial activity has modified the surficial morphology and resulted in unconsolidated deposits such as sand and gravel outwash plains and alluyial plains adjacent to present drain- ages. These will be discussed more specifically when each of the three tracts is treated. In addition, there ~re also several landslide and rock fall areas t hat wi 11 be descri bed 1 ateI'. A-8 .