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,- ~ ~ , { <br />energy fuels corporation <br />box p • neamboet tpringi, colorada 80477 • (303) 8743800 <br />August 21, 1981 <br />David Shelton <br />Colorado Mine Land Reclamation Board <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Dear Mr. Shelton: <br /> <br />'-'~' r. ;~-~. <br />~:_ . ~. <br />/~iULI I !i IJr~~ <br />(PiivED Li~i~iu frCi!".!'~'.>>iirpJ <br />Cole. Dept ci P:atcr.;l f;~,~~~;rCes <br />The office of Surface Mining and Energy Fuels Corporation have been co- <br />operating in the development of blast vibration data from which [o develop a <br />site specific scaled distance formula for the Energy (fl mine and at the same <br />time develop information that OSM can use to instruct individuals as to the <br />analysis required to develop a site specific scaled distance formu.La. By this <br />letter and pursuant to section 120(2)(0)(II) of The Code of Colorado Regu- <br />lations, Energy Fuels Corporation hereby petitions for a modified scaled dis- <br />tance formula. <br />Attached to this petition is the Instructional material developed by OSM. <br />Example 4 on page 17 details [he seismograph records obtained at the Energy bl <br />mine and a detailed analysis of this data. Rased on this analysis Energy Fuels <br />Corporation requests a modified scaled distance formula of: <br />W = ( D )2 <br />46.1 <br />Where: <br />W = maximum weight of explosives <br />detonated in any 8 millisecond <br />delay period <br />D = Distance in feet to nearest <br />structure outside of permit <br />area. <br />With this site specific modified scaled distance formula Energy Fuels <br />Corporation will be permitted to shoot 1.7 times the amount of explosives per <br />delay than under the present Colorado regulations. <br />