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GENERAL40890
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GENERAL40890
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Entry Properties
Last modified
8/24/2016 7:59:59 PM
Creation date
11/23/2007 10:54:48 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
12/4/2006
Doc Name
K-Order Modifications; 10/8/06 Landslide
From
MSHA
To
DRMS
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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Mr. Billy Owens <br />Page 2 <br />activities relative to the slide area requires that additional safety measures be utilized as <br />necessary in order to ensure that the safety and well being of the miners involved in these <br />assignments is asswed. <br />The following discussions provide additional detail regarding each task and the particular <br />safety measwes proposed to be utilized for each. A map indicating the locations where <br />the proposed tasks will occur is included for your reference (see enclosed mao entitled: <br />Trapper Mining Inc.. MSHA Work Plan Tasks 1 - 4, G-pit Slide Area). <br />Task 1: Trapper Mine will be removing the thick oak brush vegetative cover in the <br />area to the immediate south of the southern boundary of the slide zone. This task is <br />necessary to improve visibility in the area to the south of the slide so that more effective <br />visual monitoring and inspection can take place here as other work in the slide zone <br />progesses. This work will be done with bulldozers knocking the vegetation down and <br />pushing debris into piles at the mazgins of the areas to be so cleared <br />Trapper is working with the Colorado Division of Reclamation, Ivfining and Safety to this <br />purpose to allow a corridor of 150 feet on the west half of the slide and 250 feet on the <br />east half of the slide to be brushed so that the development of new cracks can be observed <br />and the monitoring of the tension cracks behind the south face can continue. <br />This work will be done during daylight hows only using experienced dozer hands <br />familiar with the hazazds associated with working around highwalls. This work area will <br />be inspected twice per shift while the work is ongoing. Two paths of egess will be <br />maintained at al] times, and positive communication will also be maintained. Equipment <br />operators will be informed of the presence of any known cracks in the vicinity of their <br />assigned work area and will maintain a safe distance from these features during brushing <br />operations. If significant cracks are noticed to be developing during inspections or while <br />work is ongoing, operators will be instructed to immediately withdraw from the area. <br />This task will be completed before other work as described below is initiated. <br />Task 2: Trapper Mine plans to seal up the tension cracks and smooth and seal <br />some of the south slide face area on the west half of the slide in order to reduce moisture <br />infiltration into the slide zone and minimize the opportunity for slide reactivation. <br />Specifically, along the west side of the slide (the portion that trends mostly north/south <br />between Northing 403,700 and 401,250 and between Fasting 1,435,300 and 1,436,600) <br />the existing south slide face and corresponding tension cracks look to be at shallow depth. <br />It is currently thought that the slide occurred on a Tonstein clay layer above the ML Seam <br />and the area described above looks to have broken at the 20 to 30 foot cover line to this <br />seam. Inspections of this area indicate that the cracking occurred at shallow depth; the <br />area is well rubblized with no significant scarp faces present. The sealing work will be <br />done during daylight hours only using experienced dozer hands familiar with the hazazds <br />S:\MSNACOMPIK Order Mod Regoesc Hl.dac <br />
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