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rr__//,\II <br />Kent Gorham <br />'jhW <br />,d?,aaon, <br />Wmg and <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Northfield Mine <br />Permit No. C-2006-085 <br />Technical Revision No. 01 (TR-01) <br />Dear Mr. Gorham, <br />Northfield Partners LLC (Northfield) requests a Technical Revision to the approved <br />coal mine application for Northfield Mine in Fremont County, Colorado. This revision <br />proposes changes to the approved layout and design of the surface mine facilities <br />and mine access. <br />Subsequent to approval of the mining permit, Northfield has conducted engineering <br />studies of alternative configurations to access the coal seam. These studies provided <br />a design that is economically feasible and improves mine safety that included a main <br />slope that is less steep, and longer than originally proposed, and an additional <br />ventilation shaft. <br />Increasing the slope length required a minor change in the location of the portal <br />entrance and modification to the location of the surrounding facility area. The <br />proposed portal site is approximately 780 feet north of the original location. In order <br />to utilize the portal location, the surface facility area is shifted northward <br />approximately 450 feet. Two ventilation shafts are proposed that situate in the same <br />area as the originally proposed single shaft. <br />All structures and improvements are substantially the same as described in the <br />approved application and affect the same amount of surface, approximately 20 <br />acres. <br />Please accept the following Summary of Revisions and supporting permit narrative <br />pages and maps as a Technical Revision to Permit No. C-2006-085. <br />Please call me directly at 719-275-8951 if you have any question. <br />Respectfully submitted, <br />Angel M. Bellantoni <br />i7'? <br />Cfnn?V1 ?(o nMernnr?1 I ?p?I I Lcenrrnnarii\Vress IInn c„ <br />1107 Main Street, Canon City, CO 81212 <br />www.envalternatives.com • e-mail: eai@bresnan.net <br />Phone: 719-275-8951 • Fax: 719-275-1715 <br />January 11, 2010