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REP37162
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REP37162
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Entry Properties
Last modified
8/25/2016 12:15:52 AM
Creation date
11/27/2007 7:42:05 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Report
Doc Date
1/19/1995
Doc Name
ANNUAL SUBSIDENCE REPORT FN C-81-041
From
POWDERHORN COAL CO
To
DMG
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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• Surface Inspections <br />One spot inspection and two regular inspections were made during 1994. <br />These inspections consisted of walking the surface above the present and recently <br />abandoned panels, taking photographs of the immediate area and marking the routes <br />traversed on a map. <br />The spot inspection was conducted by Larry Reschke and Dick Reisinger of <br />PHCC, and Erica Crosby and Paul Krabacher of DMG on January 25, 1994. The <br />Inspection started by the reclaimed portal of the abandoned Go Boy Mine and <br />progressed over the abandoned mine workings to the edge of the furthest penetration <br />of Powderhorn's 5th West Panel. Cracks were found over the 5th West Panel and <br />were recorded on the enclosed map as position 1. These cracks were up to 12 inches <br />wide, 300 ft. long and 20' deep. They were located on a steep hillside covered with <br />alluvial material and slump blocks from the cliffs above. The cracks were over an <br />area of secondary mining and may be related to subsidence or may be related to <br />normal landslide activity. <br />The first regular inspection was started by Larry Reschke on May 10, 1994. <br />This inspection started were Cottonwood Creek crosses the No. 3 South Mains and <br />progressed west across the east end of 10 West Panel, then south across 11 West and <br />• 12 West, then easterly around a ridge, then north to the point of beginning. <br />Photographs were taken at the locations marked on the map and aze numbered to <br />correspond with those enclosed in Appendix I. No subsidence related features were <br />located, mapped or photographed during this inspection. <br />The first regulaz inspection continued on May 13, 1994 and was conducted by <br />Larry Reschke and Andrew Liffi-ing. The purpose of the second day was to cover the <br />area not inspected by the inspection on the first day. This inspection covered the <br />area from the No. 2 West Portals east across 10 West, then south across 11 and 12 <br />West, then West to the 3 South Bleeder, then north to the point of beginning. This <br />inspection also revealed no subsidence related features. <br />The second inspection was conducted by Andrew Lif&ing on September 14, <br />1994. This inspection proceeded from the No. 2 West Portals east to the top of the <br />ridge seperating the Cottonwood Creek and the Colorado River drainage, then south <br />along the ridge to the southern most edge of the 12th West Panel, then back to the <br />point of beginning following nearly the same route. Cracks were found and <br />photographed at position 2 on the enclosed map. These cracks were approximately <br />3 inches wide, 100 ft long and 5 ft deep. They are located on the top of the ridge in <br />a gray shale or silty sandstone. The cracks are over an area of secondary mining in <br />10 West and could be related to subsidence in the area. <br />n <br />U <br />Page 3 <br />
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