My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2008-10-10_GENERAL DOCUMENTS - C1980007
DRMS
>
Day Forward
>
General Documents
>
Coal
>
C1980007
>
2008-10-10_GENERAL DOCUMENTS - C1980007
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
5/26/2020 2:15:47 PM
Creation date
10/16/2008 3:44:39 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
GENERAL DOCUMENTS
Doc Date
10/10/2008
Doc Name
Proposed Decision & Findings of Compliance for PR14
From
Proposes 152 Methane Drainge Wells in Panels E-2 to E-12 next 12 years
Permit Index Doc Type
Findings
Email Name
TAK
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.
/
80
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
initial surge of water which then either decreases or ceases completely <br />with time. <br />Locally, water flow through fractures probably occurs more rapidly, as <br />suggested by the seasonal fluctuation in discharge rates of some springs <br />in the mine plan area. Mine inflow studies conducted as recently as 1985 <br />have shown that the primary source of inflows are from fractures in areas <br />of low overburden. <br />As previously described in this document, MCC encountered a large <br />inflow of water while mining through a fault/fracture system in the <br />B East Mains. As of the date of this findings document, MCC continues <br />to experience mine inflow in the Sylvester Gulch area of the mine. <br />Groundwater in the area can be expected to flow generally in a downdip <br />(northward) direction, parallel to bedding, toward the deeper part of the <br />Piceance Basin. Data from monitoring wells generally indicate downdip <br />flow, although some closely spaced wells in the Barren Member have <br />highly variable water levels. Some wells are dry, indicating no <br />groundwater flow. Dry wells and variable water levels may result from <br />areal variation in permeability. Generally, springs in the permit area seem <br />to act independently of the bedrock water zones and appear to be surface <br />features related to weathered and fractured bedrock. Springs tend to <br />exhibit highly seasonal flow and discharge only during spring snow melt. <br />Springs recharge and discharge in relatively small areas. <br />Inflows into underground mine workings from faults and fractures <br />located outside stream valleys generally dry up with time or flow <br />intermittently at discrete points along the fault or fracture. Those which <br />continue to flow have flow rates which diminish to a trickle. Such mine <br />inflows from faults and fractures may represent the dewatering of <br />lenticular sandstone units with limited recharge areas, or may represent <br />flows through fracture zones extending to the surface which have narrow <br />recharge zones on steep slopes. The large initial flow rates are much <br />larger than what would be expected from intergranular porosity in low- <br />permeability sandstone (Darcy-type flow), indicating flow probably is <br />from fractures or faults. <br />Discharge of groundwater occurs through numerous seeps and springs <br />indentified in the life-of-mine area. The locations of these springs are <br />shown on Map 37 and 37A, Springs and Stock Ponds. <br />C. Surface Water <br />The North Fork of the Gunnison River is the principal drainage in the <br />mine area. Smaller streams in or adjacent to the life-of-mine areas are <br />tributary to the North Fork. The North Fork has an average annual <br />30
The URL can be used to link to this page
Your browser does not support the video tag.