2008-09-17_REVISION - M1980244 ‎(28)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 9/17/2008
• Doc Name: Response to Adequacy Review
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

mining. Accordingly, no specialized treatment would be required to make them stable should
• bond forfeiture conditions occur, no matter at what time in the project life such an unlikely
event might occur. Accordingly, the cost estimate to stabilize the walls for the financial
warranty calculation is zero.
a) The blasting will be done using scaled distances of 43.8 for blasting in the North
Cresson Mine area and 35 for all other mine bastings.
Response.
CC&V agrees with this statement, as it was presented in Appendix 4 of Volume II of the
MLE Project Application.
b) The distance input factor for the scaled distance equation will be horizontal
distance from location of any blast to the nearest man made structure not owned
or controlled by CC&V. Such structures shall include the underground workings
of the Molly Kathleen tourist mine.
Response.
CC&V has maps of the underground working associated with the Mollie Kathleen, and will
confirm with current owners of the Mollie Kathleen on any additional workings for
consideration in factoring in the scale distance equation for this area.
•
c) Peak particle velocity (ppv) caused by blasting vibration measured at any of the
monitoring locations approved by the DRMS in excess of 0.5 inches per
second(ips) must be reported to the DBMS. If measurements from any two
blasting events exceed 0.5 ips, CC&V will investigate and report the results to the
DRMS. The Division will review the results and recommend further actions as
needed.
Response.
CC&V agrees with this comment and will continue to work closely with the DRMS on
reporting any deviations recorded during CC&V active production blast monitoring.
d) In order to be consistent with previously approved revisions for the Cresson
Project, CC&V will prepare blast reports as follows for each shot. The reports must
be retained by CC&V for at least three years and must be available for inspection
by the Division upon request.
1. Location, date and time of blast.
2. Name, signature, and license number of blaster - in charge.
3. Identification, direction and distance, in feet, from the nearest blast hole to
the nearest potentially affected structures not owned or controlled by CC&V.
• 4. Type of material blasted.
5. Sketches of the blast pattern including number of holes, burden, spacing and
delay pattern. Sketches shall also show decking, if holes, are decked to
achieve different delay times within a hole;
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