2010-01-08_PERMIT FILE - M2009082

• Permit No: M2009082
• IBM Index Class Name: PERMIT FILE
• Doc Date: 1/8/2010
• Doc Name: Review of Stability Analysis Report
• From: DRMS-psh
• To: DRMS-jle
• Email Name: JLE
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
COLORADO
Denver, Colorado 80203
? D
D I V IS S I ON OF
Phone: [phone] RECLAMATION
FAX: [phone] MINING

SAFETY
Bill Ritter, Jr.
Governor
DATE: January 8, 2010 Harris D. Sherman
Executive Director
TO: Jared Ebert Ronald W. Cattany
Division Director
` Natural Resource Trustee
FROM: Peter Hays
RE: Review of Stability Analysis Report, Lafarge West, Inc., Parsons Mine,
File No. M-2009-082
The Division of Reclamation, Mining, and Safety (Division) engineering staff has reviewed the above
referenced permit application and has determined the following issues remain to be addressed relative to
the proposed mining setbacks.
1. The Division did not receive copies of the PA04 series of borings. Please submit copies of the
boring for Division review.
2. The screening berm and stockpiles are indicated as 7.5 feet in height in the stability analysis
models. The applicant must not construct the stockpile above the indicated height used in the
stability analysis during mining activities. The Division will include the stockpile height as a permit
condition.
3. The Division does not consider the use of conglomerated data adequate to provide a critical cross
section and to determine the setback from critical structures. The applicant must provide stability
analysis for each individual boring(s) associated with a critical structure. The Applicant must
provide a proposal for a single general setback or multiple setbacks, if applicable for a structure,
based on the analysis results. The Division recommends the applicant use the greatest setback
distance from a structure if multiple setbacks are indicated by the individual boring analysis.
Whitney Ditch and WCR 64.5 - Phase 1A Example
The applicant states a worst case cross section was used to evaluate the set back distances for
each phase during mining. In the individual cross sections for each phases of mining, the applicant
indicates the location of the worst case scenario for each phase, however the soil profile analyzed
for each phase is based on a conglomeration of soil information from various borings not the
actual worst case scenario.
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines