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REP39844
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REP39844
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Entry Properties
Last modified
8/25/2016 12:27:51 AM
Creation date
11/27/2007 8:33:23 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Report
Doc Date
5/10/2004
Doc Name
2003 Annual Subsidence Report
From
J.E. Stover & Associates
To
DMG
Permit Index Doc Type
Subsidence Report
Media Type
D
Archive
No
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• 2002 Production and Geologic Conditions <br />The Bowie No. 1 Mine suspended operations during December,1997 and remained idle <br />throughout the 2003 calendaz yeaz. <br />Operation Unit Descriptions <br />Bowie No. 1 Mine has no operating units to report on during the 2003 calendaz yeaz <br />Subsidence Impacts - 2003 <br />Subsidence survey monitoring of selected wide-spaced monuments in the vicinity of active mine <br />workings was conducted during June and December, 2003. Surveying of these selected stations <br />was conducted in accordance with the projected monitoring addressed in the 2003 Annual <br />Subsidence Report. Selected subsidence monitoring stations established over the Pitkin Mesa <br />pipeline were monitored also in June and December of 2003. <br />Wide-Spaced Monitoring Grid Station Summary <br />Thirteen wide-spaced monitoring grid stations were surveyed for the 2003 reporting yeaz. The <br />station locations aze shown on Map No. 2-5. The following discussions present a station by <br />station assessment of survey results generated for 2003. Monitoring station data sheets aze <br />appended to this report for reference. Please note the change from historical stations to new GPS <br />stations has created a change in all elevation reporting. This summary compazes only November <br />2001 through December 2003 for movement for the seven Pitkin Mesa Pipeline and November <br />• 2001 to June or December 2003 for the wide spaces monitoring grid stations. <br />Station 6 Surveys were initiated in August 1982 and continued biannually through July <br />1984. Surveys were re-initiated in 1987 and conducted annually through 1991 and <br />biannually 1992 - 1994. Station 6 is located on approximately 350 feet of <br />overburden and lies approximately 300 feet north of the 1st North, 2 %z West Panel <br />retreat mined from May through June, 1983. Station 61ies adjacent to the II West <br />Submain development advanced in 1987. The December 2003 survey data <br />indicates no change when compazed to the November 2001 elevation. Station 6 is <br />located within a mapped landslide azea. No mining anticipated to produce <br />subsidence has occurred in the vicinity of Station 6 since 1983. <br />Station 14 Station 14 is located in the Stevens Gulch alluvium protective buffer zone over <br />approximately 750 feet of overburden. The station was initially surveyed in June, <br />1982. Subsequent surveys have been conducted annually since 1988. Panel G was <br />advanced under this station in September, 1988. Retreat mining occurred outside <br />the buffer zone in the vicinity of this site in February, 1989. Panel C was advanced <br />adjacent to this site in December, 1992. An elevation adjustment of -0.55 feet was <br />detected at this site in October 1989 but was perhaps influenced by control station <br />coordinates being redefined. January 1991 data indicated 0.31 feet were <br />subsequently gained but again, new control point coordinates were generated. No <br />mining activity took place in the vicinity of station 14 during 2002. The December <br />• _I_ <br />
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