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CRG Mining, LLC <br /> 510 S.Wisconsin St. <br /> Gunnison,CO 81230 <br /> January 15, 2020 <br /> Dustin Czapla <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Room 215 <br /> Denver,CO 80203 <br /> Re: Sacramento Access Tunnel, Permit M-2016-084, Request for Technical Revision, Enlarge Tunnel <br /> Dimensions <br /> Dear Mr.Czapla, <br /> CRG Mining,the permittee and operator of the above-named permitted mine,wishes to request a <br /> technical revision to the permit. Specifically,we wish to increase the dimensions of an approved tunnel <br /> from 8 ft x 8 ft, up to 12 ft x 12 ft. This will allow us to use larger equipment in the mine while also <br /> improving our ability to properly ventilate the workings. <br /> The Sacramento Tunnel is the lower of the two crosscut tunnels approved for the site (we refer to the <br /> upper tunnel as the Dunraven). It will be 400 feet in length,and the inert waste rock to be mucked from <br /> driving the tunnel, less than 500 cubic yards, will be used to construct the lower working pad. This <br /> requested enlargement will approximately double the amount of waste rock to be placed on the pad, <br /> but the increased amount will still fit into the area approved for the pad. We have installed the bypass <br /> (underdrain) pipe,and will install adequate sediment control around the perimeter of the new dump <br /> material. <br /> The landowner of the site, Gold Links Mining,wishes for all underground openings to have securable, <br /> durable steel and concrete entryways(as shown in their statement included with the permit <br /> application). The Sacramento portal was approved to have such a structure. With the approval of this <br /> TR,the originally-planned 8x8 structure will be replaced in the plan with a 12x12 installation of the same <br /> type of construction. This should result in no additior-1 bond amount for the permit. <br /> No other drainage or reclamation changes are proposed, and no concerns are anticipated with this TR. <br /> There being no other site changes proposed, no updated mining or reclamation map has been enclosed <br /> with this request. <br /> Please let us know if you have any questions or concerns. <br /> Sincerely, <br /> Jake Wilkinson <br /> Manager,CRG Mining, LLC <br /> Encl: TR Request form,TR fee($216) <br />