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~ ~~~~~ <br />~... ~_ •,cs °`.'~ x^-..'-.~f=~~~=.*,33~.P"~:-~:',::ir~i ~t '•Z.c;?.ca1.iP,3T'~'at~.~ - <br />Sanborn Creek Mine <br />July 9, 1997 <br />Joanne Williams <br />Planning Director <br />('.unnison County <br />200 E. Vi.r2inia <br />Gunnison, Colorado 81230 <br />ke: Emergency Methane De-gas Drill Hole <br />Dear Ms. Williams: <br />The Sanborn Creek Mine is experiencing high levels of methane gas <br />in the eastern-most, underground working areas. One of the <br />abandoned, sealed panels is leaking methane through the seals, <br />causing potentially hazardous conditions. <br />We are requesting permission from Gunnison County to drill a 2,500- <br />foot deep, 6- to 8-inch diameter borehole from the surface above <br />the abandoned panel. Following completion of the borehole, a <br />vacuum pump would be installed on the collar of the hole to produce <br />a negative pressure in the abandoned panel, preventing methane from <br />leaking through the seal. Methane from the hole would be used to <br />power the vacu)nn pump. <br />The dri.ll.l)ole location would be at the end of the existing drill <br />road near the center of Section 1, T13S, R90W, shown on the <br />accompanying map. Access to the site would be from Highway 133 in <br />Section 10, along the public access road up Coal Gulch. Only minor <br />impruvements, as required to .get the drill rig to the site, would <br />be made to the existing roads. A small drill pad would be <br />constructed at the drill site. Exact location of the drill site <br />will be determined from survey information to locate the hole above <br />the underground mine entries. <br />I have already discussed with, and received verbal approval from, <br />Plr. David Berry, Colorado Division of Minerals and Geology, and Mr. <br />Alan Belt, Bureau of Land hlanagement. A Minor Revision for IiMG, <br />a.nd a notification letter for BLM will be prepared as soon as <br />possible. We intend to drill. the hole as soon as a drill rig can <br />be mobilized to the site. <br />Sincerely, <br />~u ~~~- <br />Thomas C. Anderson, P.E. <br />Environmental Coordinator <br />P O 0 u :; 5 :] 5 ~ u m n, s r_, C o l o r a d o 8 1 4 3 4 U S A <br />Tr L. !4~n) 3:!9-ti1:!'? F=;\iC (970) 929-57 77 <br />