REP21491

• Permit No: C1981044
• IBM Index Class Name: Report
• Doc Date: 2/17/1984
• Doc Name: MEMO EMPIRE ENERGY CORPS FALL 1983 SUBSIDENCE MONITORING REPORT
• From: MLRD
• To: SANDRA EMRICH
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

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DEPARTMENT OF NATURAL RESOURCES 999
David H. Getches. Executive Director
Richard D. Lamm
Governor
T0:
FROM:
RE:
MINED LAND RECLAMATION DIVISION
DAVID C. SHELTON, Director
M E M O R A N D U M
r 17 February 1984
Sandra Emrich ~ \,' ~ ~~
Jim Pendleton -~--~-`"""~
Empire Energy Corpor~ion's Fall, 1983 Subsidence Monitoring Report
(_ i
Pursuant to your request, I have completed a review of the Fall, 1983
Subsidence Monitoring Report submitted by Empire Energy Corporation for their
Eagle No. 5 & No. 9 Mines Complex. This report observes that the maximum
observed subsidence "... is slightly greater than the predicted subsidence
using the Abel and Lee equations for subsidence." In the cases of monument
rows A and B the overage approaches 30 to 40 percent of the originally
predicted maximum value. I do not believe that this degree of overage 1s
critical in these particular areas. However, we should review the next report
closely, in order to ascertain whether the observed overage continues to
increase. It may be necessary to require amendment of the permit document
subsidence treatment, if the overage significantly Increases above that now
documented.
In my memo to you dated January 3, 1984, I reviewed the subsidence monitoring
report format proposed by Empire Energy Corporation, in response to
Stipulation No. 23 of their approved permit for the Eagle Mine Complex. In
that same memo, I recommended the Inclusion of horizontal location survey data
within their report format, in addition to the vertical data proposed by the
operator. Because my review postdates the operator's submission of their Fall
'83 subsidence monitoring report submittal, I do not consider 1t appropriate
to require amendment of this report. In the future, however, we should
require the inclusion of both the horizontal and vertical monument location
survey information within the report.
With this understanding, I
Monitoring Report submitted
No. 9 Mine Complex.
cc: Ed Bischoff
Doc. No: 9456E
recommend that we accept the Fall 1983 Subsidence
by Empire Energy Corporation for its Eagle No. 5 6
423 Centennial Building, 1313 Sherman Street Denver, Colorado 8020:1 Tel. [phone]