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2012-06-20_PERMIT FILE - C2010089A (19)
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2012-06-20_PERMIT FILE - C2010089A (19)
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Last modified
8/24/2016 5:01:22 PM
Creation date
8/24/2012 10:42:43 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C2010089A
IBM Index Class Name
PERMIT FILE
Doc Date
6/20/2012
Doc Name
Overburden Blasting
Section_Exhibit Name
Section 2.05.3(6)(a)
Media Type
D
Archive
Yes
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animal, or agricultural purposes, and to the quantity and quality of the water. <br />A written report of the survey will be prepared and signed by the person who conducted the <br />survey. Copies of the report will be provided to the person requesting the survey and to DRMS. <br />If the person requesting the survey disagrees with the results of the survey, he or she may <br />notify, in writing, both WFC and DRMS of specific areas of disagreement. A list of all completed <br />pre -blast surveys on file can be reviewed in Attachment 2.05.3(6)(a) -1. <br />If, subsequent to a pre -blast survey, a request is made by a resident or owner to survey an <br />addition or renovation to a dwelling or structure within one -half mile of the permit area, such <br />survey will also be conducted in accordance with Rule 4.08.2. <br />Blast Design <br />WFC will set out numerous seismographs at nearby residences to collect actual seismograph <br />data. As more seismic records become available, WFC shall, if necessary, modify the scale <br />distance factor and the blast to reduce vibration and cost. New scale factors will be calculated <br />using the OSM Blast Vibration Regression Analysis Program, see Attachment 2.05.3.(6)(a) -2. <br />WFC will apply its blasting experience from the New Horizon 2 (NH2) Mine to the NHN Mine. At <br />the NH2 Mine, WFC monitors each blast and modifies the blast designs as needed to achieve <br />the necessary fragmentation at the lowest cost, and at the lowest vibration level possible. <br />Burden and spacing distances, borehole diameter, and different delay sequences have been <br />tried. Each parameter is individually changed so the modification can be monitored and <br />recorded. An elaborate blast design system was developed that took into account: distance to <br />the nearest dwelling /structure, number of blast holes in the pattern, number of holes detonating <br />within any 8 ms period, and the desired degree of breakage. Every blast at the New Horizon <br />Mine is analyzed before and after the detonation and the knowledge gained is used to <br />continually fine tune the blasting program. In conclusion, WFC relies on the ever growing <br />seismic data bank and blast design data to design future blasts, rather than use a generic scale <br />distance factor. <br />Blasting operations at the NHN Mine may occasionally be conducted within 1000 feet of <br />buildings used as dwellings, public buildings, schools, churches or community buildings and <br />Section 2.05.3(6)(a) Page 2 <br />
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