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GENERAL53794
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Last modified
8/24/2016 8:39:14 PM
Creation date
11/23/2007 8:56:15 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
11/7/2003
Doc Name
Memo Regarding Vicinity Underground Mine Fire
From
Steve Renner
To
Joe Dudash
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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As a point of reference, a number of nearby structural remnants can be used to help locate <br />the observed fire features. Two upright steel I-beams painted a blue green color aze <br />situated approximately forty-five feet west of Feature 1. Also, two expanded metal straps <br />are attached to a sandstone outcrop approximately thirty five feet upslope of Feature 1. <br />Feature 2 is a small venting fracture measuring about eighteen inches in length, by about <br />one inch wide. It is located approximately sixty-five feet south east of Feature 1, and <br />about fifteen feet downslope of the same sandstone outcrop that the expanded metal <br />straps aze anchored in. The perimeter of the fracture is noticeably wet. Ground surface <br />temperatures at this feature did not exceed 105°. Likely this feature emits noticeable <br />steam during cold weather. <br />Feature 3 is a lazge, active, triangulaz shaped vent. The vent, which is visible in <br />photographs taken from Highway 133,. is about four feet by two feet; and:is.open-for <br />approximately ten feet, as it slopes downward into the mountain. At about ten feet depth, <br />the feature constricts to a tight vent. Creosote staining is apparent on the rocks within <br />and immediately outside of the opening. Ground surface temperatures of about 200° <br />were measured within the. feature. This feature is located uphill of the sandstone outcrop <br />that the expanded metal straps aze attached to, and is immediately south of Feature 1, but <br />about thirty feet higher in elevation. <br />Many fractures are appazent on the slope between Features 1 and 3. These fractures, <br />which aze pazallel with contour, aze generally located at 38° 55' 35"; 107° 27' 47.1". <br />These fractures are cold, not.exhibiting temperatures above ambient conditions. <br />Feature 4 is a series of parallel fractures approximately twelve to fifteen feet in length. <br />These fractures occur parallel with contour, and generally on-strike between Features 1 <br />and 3. Ground surface temperatures at this area vary between 250° and 450°. Evidence <br />of scorched roots of various grasses and annual weeds was observed in the vicinity of the <br />fractures. Feature 4, located at approximately 38° 55' 35.2"; 1070 27' 47.2", is located <br />on contour, about ten feet east of the expanded metal straps fixed to the sandstone. <br />It is difficult to draw definitive conclusions about an underground fire from observable <br />surface features. However, some fire related chazacteristics maybe inferred from surface <br />observations. Features 1, 3 and 4 all appeaz to align with each other, approximately <br />perpendicular to contour. These features appear to vent the C seam, and appear to be <br />located near the described location of the Bear Number 3 entry. This observation <br />suggests that a relationship between the entry and the fire exists. One way to help <br />ascertain which mine and associated seam aze involved in the fire may be to determine <br />whether this alignment coincides with mapped mine entries. When evaluating the <br />underground maps, care should be taken to determine whether the apparently mined seam <br />is connected to other seams byway of interconnecting rock tunnels. <br />The higher temperatures observed at portions of Feature 1 and at Feature 4 suggest a <br />relatively nearby heat source. A subsidence failure at Feature 1 may serve to confirm this <br />theory. This is not to say that other portions of the mine aze not be burning, however. <br />
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