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• 2.7 HYDROLOGY <br />The Trapper mine sfte is located on the north-facing sbpe of the Williams Fork Mountains within <br />the Yampa River basin in northwestern Colorado (see Map M52). The Yampa River basin, <br />including the Little Snake River sub-basin, is part of the Green River basin (Figure 2.7-1). The <br />Green River is a tributary of the Colorado River. The crest of the Williams Forts Mountains foetus <br />the drainage divide between the main stem of the Yampa River and a major Yampa River <br />tributary, the Williams Fork River. The tributaries on the north face of the mountains which will be <br />impeded due to mining include Flume, Pyeatt, Johnson, No Name ,Coyote and Buzzarl <br />Gulches. Although mining is not planned south of the mountain crest, parts of the following <br />Williams Fork River tributaries drainage basins lie within the mine plan area: Deal, Horse, Castor <br />and Ute Gulches, and three small gulches known as ,Deer, Elk and Small Gulches. <br />2.7.1 Toaograghv and Geologic Setting <br />The Trapper Mine is located in a complex geological setting. Past depositional processes formed <br />discontinuous lenticular beds with variable lilhology which have been subsequently a8ected by <br />tectonic activity. The geology along with topography of the site determines the ground-water <br />• regime of the area. <br />2-3~t8 <br />__~AY_13 1998__-- <br />