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REP41127
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REP41127
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Entry Properties
Last modified
8/25/2016 12:43:01 AM
Creation date
11/27/2007 8:56:32 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Report
Doc Date
10/2/1995
Doc Name
EDNA MINE C-80-001 MOFFAT AREA STABILITY
From
DMG
To
PITTSBURG & MIDWAY COAL MINING CO
Permit Index Doc Type
STABILITY REPORT
Media Type
D
Archive
No
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:= <br /> <br /> <br />STATE iii iuiiliillluiu <br />999 <br />OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />I } 13 Sherman 51., Room 215 Jra <br /> <br />Denver, Color. rio 80203 ~~ <br /> <br />Phone: 13031 866-7 567 III <br />FA%: 13031 A12-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br />October 2, 1995 <br /> Roy Romer <br /> Governor <br />David L. Beverlin wmess.LO~nneaa <br />Edna Mine Execufve Director <br /> <br />The Pittsburg & Midway Coal Mining Company Michael B Long <br />Dn-islon Duec iui <br />P.O. Box 176 <br />Oak Creek, Colorado 80467 <br />Brian D. Gontarek <br />The Pittsburgg & Midway Coal Mining Company <br />6400 South Fiddleis Green Circle <br />Englewood, Colorado 80111-4991 <br />RE: Edna Mine (C-80-001) <br />Moffat Area Stability <br />Dear Mr. Beverlin and Mr. Gontarek: <br />The purpose of this letter is to provide documentation for a number of conversations between <br />various individuals on the P&M and Division staffs, and a brief chronology of events contributing <br />to the Division's concern for stability of the Moffat Pit area at the Edna Mine. <br />Kent Gorham of the Division became concerned with the possibility of instability in the Moffat <br />pit when, in the course of a routine site inspection, he observed the absence of a low wall. Mr. <br />Gorham communicated those concerns in a memo to Jim Pendleton of the Division. <br />Dr. Pendleton reviewed the original pit stability demonstrations for the Moffat mining area, and <br />compared those conditions to the current pit configuration as observed by Mr. Gorham. Dr. <br />Pendleton wrote a memo and subsequent addendum, to me, outlining proposed mitigative <br />measures to be implemented to ensure stability in the reclaimed pit area. Among those <br />measures were the ripping of the parting between the Wadge and Lower Wade seams to create <br />drainage windows; and the installation of toe drains at the low end of the pit. <br />Larry Routten inspected the site on September 12, 1995, and documented additional <br />observations of the pit area in his site inspection report. Mr. Routten noted that the final pit <br />highwall had been reduced to large boulders. Mr. Routten also noted that P&M representatives <br />had informed him that the parting was 20 to 30 feet thick and had been fractured in the vicinity <br />of the spoil spring, and that the spoil spring south of the current pit had dried out in the last two <br />weeks. Mr. Routten was also told that the final pit was updip of the spoil spring and therefore <br />would drain to the spring. Dr. Pendleton then reviewed the report, and has since modified his <br />recommendations. The current recommendations follow. <br />P&M should install three stability monitoring pins on the reclaimed spoil. The <br />pins should be placed 100' out (south) from the highwall edge, on the spoil. Two <br />of the pins should be on the reclaimed pit, running east/west, and one ptn along <br />the same line on undisturbed ground just west (downgradient) of the pit. <br />
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