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'00e? <br />OXBOW MINING, LLC <br />3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel (970)929-5122 Fax <br />(970)929-5177 <br />March 31, 2009 <br />RECEIVED <br />Ms Marcia Talvitie, P.E. <br />Environmental Protection Specialist APR 0 3 2009 <br />Colorado Division of Reclamation, Mining and Safety Division ,,",amation, <br />691 County Road 233, Suite A-2 Mining and Safety <br />Durango, CO. 81301 <br />Re: Oxbow Mining LLC, Permit No. C-1981-022 <br />TR-62 Application for Mine Plan Change, Additional Gob Vent Boreholes. <br />Dear Ms. Talvitie, <br />The purpose of this letter is to request Technical Revision No. 62 to the Oxbow Mining LLC <br />(OMLLC) Permit No. C-1981-022. This TR provides for the addition of gob vent boreholes to <br />the mine plan for the six north panels LW-15 through LW-20. <br />To aid in the ventilation of hazardous mine gases, additional gob vent boreholes will need to be <br />installed in the six north panels LW-15 through LW-20. The additional sites are shown on the <br />attached Drawing 2.05-MI, Sheet 6 of 6, "General Facilities, GobVent Boreholes." In addition <br />we are submitting revised PAP pages 2.05-31 a, 50a, Exhibit 2.04-E3, Item 9 - Methane <br />Drainage Well Information <br />OMLLC has previously permitted gob vent borehole programs (TR 46, 48, 53, 54 and 56). The <br />subject of this TR is a forward looking, 3 year plan where drill pads, associated temporary, light <br />use roads and up to 61 mine ventilation boreholes will be installed in phases, fitted with pumps <br />for mine ventilation, and eventually reclaimed. Mining into this north district will involve some <br />of the deepest overall overburden depth (up to possibly 2,800') and Oxbow is taking particular <br />care to make sure adequate ventilation boreholes are installed to provide for miner safety. <br />Site Construction, Operation and Reclamation <br />The project will be very similar to that which had previously taken place for current borehole <br />sites. Overall, the sites will be accessed via the pre-existing Bear Creek canyon ranch road. <br />New road segments will be constructed using sidecast construction techniques, cutting and filling <br />as needed to achieve a typical road width of about 10 - 16 feet. <br />The pad sites will be approximately 150 feet wide and 150 feet long or 0.50 acres. Any salvaged <br />topsoil will be stockpiled adjacent to the pad. Drill fluids will be collected in mud pits. <br />(Approximately, 8'D x 10'W x 40'L in size) <br />• Page 1