My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
PERMFILE104696
DRMS
>
Back File Migration
>
Permit File
>
100000
>
PERMFILE104696
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 9:57:51 PM
Creation date
11/24/2007 11:27:27 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
PREDICTED LONGWALL SUBSIDENCE FOR THE SANBORN CREEK MINE ABEL 1997
From
Old Exhibit 2.05-E2 Part 4
Section_Exhibit Name
Exhibit 2.05-E8 Part 3
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
77
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Sanborn Creek Subsidence Page 3 September 2, 1997 <br />- inside the panel group boundaries projected upward to the ground <br />surface. These ridges will approach a maximum height of 1-ft above <br />the subsided ground surface. <br />Panel #1 (Plate 1), the potential single longwall panel with <br />_ its long axis east-west, is the shallowest planned longwall panel, <br />ranging from 480-ft depth at its southeast corner to 1080-ft at its <br />-• northwest corner. The predicted maximum vertical surface <br />subsidence over Panel #1 is 9.72-ft, the predicted maximum <br />horizontal ground surface tensile strain is 12100µe and the <br />'- predicted maximum horizontal surface compressive strain is 10050µe. <br />The maximum predicted tensile strain will probably result in <br />greater than 1-ft wide open fractures at the ground surface. <br />-_ Planned Panel #1 underlies a short, approximately 500-ft long <br />section the old alignment of State Highway 133. Predicted maximum <br />subsidence of State Highway 133 from planned longwall mining of <br />_. Panel #1 will lower the right-of-way approximately 4-ft. The <br />predicted maximum tensile strain and the associated widest surface <br />fractures are predicted to cross State Highway 133. In addition, <br />_ approximately 700-ft of the north-side highway cut slope to the <br />west and 150-ft to the east of the panel will be subjected to less, <br />but still potentially disruptive, vertical subsidence and <br />horizontal tensile strain. The North Fork of the Gunnison River <br />-' should not be subsided or strained by planned longwall mining Panel <br />#1. <br />~~ The central part of the possible landslide area that overlies <br />a portion of Panels #5 - #7 (Plate 9) will be subsided by longwall <br />mining of that group. Typical features of a sliding mass of rock, <br />i.e. a headwall scarp or a hummocky ground surface, were not <br />identified when inspected on July 25, 1997. An approximately 9-ft <br />high toe buttress will result from lowering of the central portion <br />of the possible slide. The present stability of the possible <br />landslide mass should increase as the result of the subsidence <br />accompanying longwall mining of Panels #5 - #7. <br />Some portion of all thirteen planned longwall panels are <br />overlain by abandoned Hawksnest Mine workings, approximately 364-ft <br />overhead. The Hawksnest Mine E Seam workings are present over the <br />`" shallower southern one-third or less of Panel #2 and Panel #3, the <br />extreme northern and southern ends of Panel #4 and most of Panels <br />#5 - #13. The shallowest southernmost 400-ft to 800-ft of Panels <br />-- #9 - #12 are overlain by abandoned Oliver No. 1 Mine D seam <br />workings that are 238-ft overhead. Roughly the northern third and <br />western half of Panel #1 is overlain by Hawksnest Mine workings. <br />~-- Planned longwall mining in the Sanborn Creek Mine should not be <br />adversely impacted by stress concentrations under barrier pillars <br />f in the overlying workings because the stress concentrations should <br />be laterally distributed and dissipated by the thickness of the <br />interburden and the weighted average 568 sandstone in the <br />L 3 <br />
The URL can be used to link to this page
Your browser does not support the video tag.