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GENERAL42468
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Last modified
8/24/2016 8:11:03 PM
Creation date
11/23/2007 11:47:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
8/26/1985
Doc Name
Proposed Decision & Findings of Compliance for PR1
From
Addition of 1,630 Acres
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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_11_ <br />and the area is probably an alluvial valley floor. However, a formal <br />determination for either of these two areas will not be made at this ~.; <br />time. When the applicant submits an application that proposes mining •- <br />activities within either the surface watershed or ground water system <br />for these areas, the Division will make the required alluvial valley <br />floor determinations. <br />A third area iS located along Sylvester Gulch. As identified in the <br />Mt. Gunnison application, this area is approximately 20 acres in size. <br />Examination of the Division's aerial photography suggests that the area <br />of possible fill may be considerably smaller. The applicant notes <br />(2-34a) that the "alluvial origin of the valley deposits at this <br />location is'doubtful". The non-alluvial origin of this fill is <br />confirmed by geologic mapping by the Colorado Geological Survey (lunge, <br />1918, see attached map) which identifies the fill material as <br />colluvial-wedge deposits formed by gravity-dominated processes (Qcw). <br />On the basis of this information, this area is found not to meet the <br />geomorphic criteria for an alluvial valley floor. <br />The fourth area identified as having alluvial deposits is located along <br />the North Fork of the Gunnison River. Deposits located upstream of the <br />proposed operations are not apart of the hydrologic system that could <br />be affected, and no determination will be made at this time. The <br />first area of unconsolidated streamlaid deposits adjacent to the permit <br />area is found at the mouth of Sylvester Gulch. This area is identified <br />incorrectly by the applicant as being an alluvial fan and excluded by <br />the applicant from alluvial valley floor consideration because it is an <br />upland area by definition (page 2-343d). The Division re'ects this <br />argument. The definition of upland areas (Rule 1.04 (147) only <br />excludes landforms, such as alluvial fans, when they are located <br />outside the flood plain and terrace complex. The area in question is <br />clearly located within the valley bottom landform. However, this area <br />is found not to be an alluvial valley floor based on its current size. <br />The Colorado Department of Highways has relocated State Highway 133 to <br />bisect the site under consideration. As a result, the area is now too <br />small a unit to be practically formed and therefore is. excluded from <br />further consideration. <br />Between Sylvester Gulch and the town of Somerset, several smaller <br />bodies of alluvium lie along the course of the river. Two of these <br />areas are occupied by the Bear Mine Portal and Bear loadout. None of <br />these areas meet the size criteria of the state (10 acres), and these <br />areas are found not be alluvial valley floors. <br />Downstream from the town of Somerset, the valley opens up and the <br />applicant has identified a much larger body of.alluvium. Areas within <br />Sections 13 and 14 have been identified as currently supporting <br />agriculture. No specific information has been provided concerning <br />flood irrigation (existing or potential) or subirrigation. On the <br />basis of the information provided, the North Fork of the Gunnison and <br />its associated alluvium in Section 18 (T135, R90W), and Sections 13 <br />and 14 (T13S, R90W) are found to meet the criteria of alluvial valley <br /> <br />
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