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1997-11-13_REVISION - M1977493 (50)
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1997-11-13_REVISION - M1977493 (50)
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Entry Properties
Last modified
6/16/2021 5:41:07 PM
Creation date
3/3/2009 1:49:11 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
REVISION
Doc Date
11/13/1997
Doc Name
Eagle Park reservoir- Final Reclamation Report and Analytical Summary
From
Climax Molyb
To
DMG
Type & Sequence
SR2
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Woodward-Clyde <br /> Mr. Bryce Romig <br /> Climax Molybdenum Company <br /> October 14, 1997 <br /> Page 2 <br /> Bedrock in the reservoir rim area consists primarily of the Minturn Formation and regional <br /> bedding generally dips about 20 degrees to the east northeast. There are several short traces <br /> of faults in the area. The fault trends are east-northeast to easterly. Bedrock along the <br /> reservoir rim is comprised primarily of sandstone and conglomerate, with lesser amounts of <br /> hard shale,which is in some places interbedded with the sandstone, and dolomite. The <br /> sandstone is moderately strong to very strong and slightly to highly weathered. It is <br /> generally less strong and more weathered when interbedded with conglomerate, as it is where <br /> the recent shallow landsliding occurred. <br /> The general orientation of the slope is east-west and the average slope is between 1:1 to 2:1 <br /> (h:v). Measurement of bedding joints at the site indicate a bedding dip direction bearing <br /> between 30 and 150 degrees, with most values between 48 and 100 degrees, and a bedding <br /> dip angle of 13 to 41 degrees, with most values between 15 and 25 degrees. An exception to <br /> this is in the area where the recent shallow sliding occurred, as discussed below. <br /> Stereonet interpretation of the joint measurements suggests that there is a major joint set, a <br /> minor joint set, and some randomly oriented joints. Joints of the major joint set have a dip <br /> direction bearing between 330 and 360 degrees and dip angles between 40 and 81 degrees. <br /> This joint set forms the face of the outcrop and generally defines the south reservoir rim <br /> slope. The minor joint set is near vertical. Joints of this set have a dip of 80 to 90 degrees, <br /> bearing 46 to 90 degrees (northeast), and a dip of 67 to 90 degrees bearing 243 to 270 degrees <br /> (southwest). The random joints have dip angles greater than 65 degrees and dip northward. <br /> The prominent sandstone face at the west end of the study area is a striated shear surface <br /> which has an orientation constant with the major joint set. <br /> Shallow Landslidin, <br /> The recent landsliding appears to have consisted of a thin veneer 1 to 5 feet thick, of <br /> colluvium sliding on the steeply dipping bedrock surface. The bedrock in the area is <br /> moderately to highly weathered sandstone and conglomerate. Measurement of <br /> discontinuities in this area were made from a distance because of access limitations and they <br /> suggest that the bedding in the slide area is consistent with the major joint set and not with <br /> the regional bedding. The high degree of weathering and different bedding orientation <br /> implies that the rock in this area has undergone some local deformation. <br /> Further sliding of shallow colluvium on this slope is possible. The colluvium depth, as <br /> exposed in the recent landslide scarps and adjacent gullies, is generally less than 3 feet and, <br /> consequently,the volume of any future colluvium slides is expected to be small, and <br /> 24435-3936/1E2.000 7/23197(1:50 PM)IRPT <br />
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