2004-03-17_REVISION - M1979097

• Permit No: M1979097
• IBM Index Class Name: Revision
• Doc Date: 3/17/2004
• Doc Name: Adequacy Ltr
• From: DMG
• To: Lafarge West Inc
• Type & Sequence: TR3
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY /
Department of Natural Resources v
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: (303) 832$106
Mazch 17, 20041
Mr. John Rozelle /
Lafazge West, Inc. d
1400 W. 64a' Ave.
P.O. Box 21588
Denver, CO 80221
1.~
RE: East Rigden Pit, Permit No. M-1979-097
Technical vision 03- Adequacy Letter
Deaz Mr. Rozelle,
COLORADO
DIVISION O F
MINERALS
GEOLOGY
RECLAMATION•MINING
SAFETY•ECIENCE
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Canany
Division Director
Natural Resource Trustee
The Division of Minerals and Geology received Technical Revision 03 (TR-03) to the East Rigden Pit,
Permit No. M-1979-097. The revision was submitted by Lafazge to address the stability of the lateral
berm that sepazates the East Rigden Pit and the adjacent POE Pit, Permit M-1982-182. The revision
also addresses the installation of aloes-water crossing in the La Poudre River.
The Division has the following comments and questions regarding the proposed revision;
1. Please inform the Division as to when Lafazge intends to implement the proposed designs to the
lateral berm between the POE Pit and the East Rigden Pit.
2. Lafazge provided a copy of the approval letter from the US Army Corps of Engineers to install a
low-water crossing within the La Poudre River for the mining of the extreme eastern portion of
the pit. The permitted area is defined as the Baumgartner property. The mining limits are 13.4
acres in size. The amendment application (approved in 1980), incorporates the general crossing
azea within the permit boundary area, but does not state that a crossing will be installed.
According to Lafarge, mining and reclamation is nearly complete in this azea and the crossing
will be removed in April of 2004.
As noted in the Division's January 13, 2004 inspection report, Lafazge was informed that certain
aspects of the crossing must be included in the mining and reclamation permit for the East
Rigden Pit. Due to the fact that the low-water crossing will be removed by April of 2004, the
Division will only require Lafazge to address issues pertaining to reclamation of disturbed azeas
in the La Poudre River associated with the crossing. Please explain how the low-river crossing
will be reclaimed. In particulaz, state;
• The structures that will be removed from the creek (culverts, rock material,
etc...) and where this material will be disposed.
• The depth of topsoil to be replaced on affected areas.
• The slope of the reclaimed banks.
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geological Survey