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GENERAL45351
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Last modified
8/24/2016 8:14:26 PM
Creation date
11/23/2007 1:43:35 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
4/10/1998
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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Local temperature is inversely related to elevation. Mean annual temperatures along the mountain <br />peaks are much colder than the mean annual temperatures of adjacent valleys. The mean annual <br />temperature of Paonia, Colorado is approximately 50°F. Temperature extremes recorded at <br />Paonia are -28°F (January 1913) and 100°F (June 1927; July and August 1934). <br />Precipitation is directly related to elevation. The valley in which Paonia and Somerset aze situated <br />is semi-arid with average annual precipitation of 15 inches. Mean annual precipitation increases <br />with elevation, approaching 40 inches per year on the summit of Mt. Gunnison. Annual snowfall <br />on mountain peaks south of Somerset, Colorado, is greater than 300 inches. Average annual <br />snowfall at Paonia, Colorado, is approximately 58 inches. The May to September precipitation <br />is five inches for the lowlands, and 13 inches for the nearby mountain peaks. The remaining <br />majority of precipitation occurs during the months of October to April. <br />Average annual precipitation at Somerset, Colorado, is twenty-five inches (Figure 2). Information <br />from the West Elk Mine permit application indicates that approximately two-thirds of the annual <br />precipitation occurs between October and April of each year. The remainder of the precipitation <br />occurs between the months of May and September. The Wilcox Ranch Station, located near <br />Bowie, Colorado, is the closest weather station to the Bear Mine. Data collected at this station <br />indicate that a similar precipitation pattern has been present for seventy years (Figure 3). <br />The Wilcox Ranch Station is at a lower elevation than Somerset; therefore, the location exhibits <br />less precipitation. Wind direction at the mine site is generally west-northwest and east-southeast. <br />The wind direction is controlled by the east-west orientation of the North Fork of the Gunnison <br />River canyon. Diurnal heating and cooling of the land surface produce typical mountain-valley <br />wind patterns. Winds from the west occur during most of the day while weaker winds from the <br />east occur at night. <br />Geology -Rules 2.04.5 and 2.04.6(2) <br />Information describing the geology of the permit area is presented in Sections 2.04.5 and 2.04.6 <br />of the Bear No. 1 and 2 permit application, and Sections 2.04.5 and 2.04.6 of the Bear No. 3 <br />permit revision application. Additional geological information is presented on the Regional <br />Geology Map (Map 5), Geology Hydrology Map (Map 6), the Geologic Cross Section (Map 7), <br />and Drill Hole Logs (Exhibit 8) of the Bear No. 3 permit revision application. <br />The mine is within the Paonia Coal Field. The rocks exposed in the Paonia Coal Field consist of <br />the Mancos Shale and the coal-bearing Mesaverde Formation of Upper Cretaceous Age, the Ohio <br />Creek Conglomerate, the Wasatch Formation of Early Tertiary Age, and a quartz monzonite <br />porphyry of Tertiary Age. (Figure 4) The Mesaverde Formation is of Late Cretaceous Age and <br />conformably overlies the Mancos shale. This formation consists of approximately 2,500 feet of <br />marine and terrestrial sedimentary rocks. The Mesaverde Formation is the coal-bearing formation <br />in the region and is divided into four members. The members in order of decreasing age are the <br />Rollins Sandstone, the Lower Coal Bearing (Bowie) member, the Upper Coal Bearing (Paonia) <br />member, and the Barren (Undifferentiated) member. <br />6 <br />
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