Laserfiche WebLink
SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> 2.0 Physiographic and Climatic Information <br /> 3.0 Historical Mining <br /> 4.0 Geology <br /> 5.0 Surface Water Hydrology <br /> 6.0 Water Use <br /> 7.0 Hydrogeology <br /> 8.0 SMC Hydrogeology <br /> 9.0 Monitoring Well Program <br /> 10.0 Groundwater Monitoring <br /> 11.0 Interpretation <br /> 12.0 Hydrogeologic Conceptual Model <br /> 13.0 Summary and Conclusions <br /> Appendices A through G present figures, tables, graphs and plots, Denison figures, monitoring <br /> well information, slug test results, and lab reports, respectively. <br /> 2.0 PHYSIOGRAPHIC AND CLIMATIC INFORMATION <br /> The SMC is located in the semiarid Dolores River Basin which lies within the Canyon Lands <br /> division of the Colorado Plateaus physiographic province (Cater, 1955). The Canyon Lands <br /> division is characterized by the prevalence of heavily dissected plateaus forming many canyons. <br /> Some upwarping has occurred as well as isolated igneous mountain ranges. <br /> The mines of the SMC lie along the northeast side of the northwest trending cuesta ridge that <br /> separates Big Gypsum Valley to the northeast from Disappointment Valley to the southwest. A <br /> similar parallel ridge separates Big Gypsum Valley to the southwest from Dry Creek Basin to the <br /> northeast. The valleys and separating ridges in this region are fault controlled. The cuesta ridge <br /> that hosts the mines is made up of sedimentary rock units dipping to the west-southwest. The <br /> ridge attains elevations up to 6,300 ft whereas valley floors are approximately 5,600 to 5,700 ft <br /> above mean sea level (amsl). Both Big Gypsum Valley and Disappointment Valley form <br /> ephemeral drainages that are tributary to the Dolores River; Big Gypsum Creek drains gently to <br /> the west-northwest to where it intersects the Dolores River, and Disappointment Creek joins the <br /> Dolores River. The Dolores River is the only perennial stream in the area and receives most of <br /> its flow from the western slopes of the La Plata and Rico Mountains, located approximately 60 <br /> miles to the southeast (Weir, 1983). The underground workings of the mines extend south into <br /> the ridge that separates Big Gypsum Valley from Disappointment Valley. South of the ridgeline, <br /> Western Water& Land, Inc. 3 <br />