REV00196

• Permit No: C1981012
• IBM Index Class Name: Revision
• Doc Date: 6/4/1986
• Doc Name: NEW ELK MINE MID TERM REVIEW SUBJECT AREAS 2.04-5 EXHIBIT 6 PERMIT REVISION 01 SECTION 3 PT 3 GEOLOG
• From: MLRD
• To: JEFF DECKLER
• Type & Sequence: MT1
• Media Type: D
• Archive: No

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H $ DEPARTMENT OF NATURAL RESOURCES
i n ~ ~ * David H. Gefches, Executive Director
'~ MINED LAND RECLAMATION DI\
} ~87G * DAVIDC. SHELTO N, Director
Richartl D. Lamm
Governor
DATE: June 4, 1986
70: Jeff Deckler
FROM: Dale Plume
nn;d-icvrn V.ev~t.
RE: NEW ELK MINE MID-TERM REVIEW, SUBJECT AREAS: 2.04-5, EXHIBIT 6, PERMIT
REVISION O1 SECTION 3, PT 3, GEOLOGY: AND, 2,04-8, 2.05-42, EXHIBITS 6,
8, 9 STIPULATIONS 10-13, 16, 17, PERMIT REVISION O1 SEC. 3, PT 4,
GROUND WATER HYDROLOGY
I. Geology Heading
1. Has recent mining and development work in both mines expanded the
mined area out beyond the original perimeter as defined by CF & I
in the permit document. If so, has mining exposed any new
(previously undiscovered) geologic structures that could affect the
ground water regimen?
Maps and discussion of New Elk Mine inflow points indicate the
possible presence of a NNW trending linear element (shear,
channel, or extension zone?). However, the discussion fails to
reflect on the geologic properties of this potential structure
and the probable implications on ground water flow if this is a
linear geologic structure.
A quote from the permit application document reads as follows:
"sills and dikes associated with Tertiary volcanism intrude the
Vermejo and Raton formations in Picketwire Valley." If
these are present in the permit area or near the mine, please
show these on the geologic maps (Map 6 and cross-sections
Page 7, Exhibit 6), even if these are obscured by overburden
but present at the mine level.
2. If additional exploration holes
laboratory and geophysical data
stratigraphic correlation beyond
application. Information such a
useful in determining ground wat
should be included in the sectio
the Exhibit.
have been drilled recently, all
should be used to extend out the
that of the original permit
s changes in permeability would be
er trends if these exist. Some of this
n entitled "Bedrock Studies" Page 15 of
3. No documentation has been found that adequately addresses the question
of subsidence during longwall mining and how this would affect the
ground water flow above the longwalled area.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. [phone]