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613 i <br /> DID, <br /> EXPEDITIONS <br /> 2/21/2022 <br /> Lucas J.West <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver,Colorado 80203 <br /> Re: Midwest NOI# P-2021-004 <br /> Midwest Mine General overview <br /> 2021 - <br /> According to historic documentation from Colorado Geological Society and USGS there are two <br /> adit portals at the Midwest Mine. The original adit that operated from 1910-1979, hereafter <br /> known as Adit #1; and the second adit, which was cut and shored by Homestake mining in <br /> 1982. Our work is focusing on the second adit, hereafter known as the Homestake Adit, which <br /> was built in 1982 by Homestake Mining. The Adit is roughly 120'south-southwest of the <br /> Homestake adit and has been reclaimed by Colorado Division of Reclamation. The original portal <br /> was reported to have a 2-degree decline for water drainage. <br /> According to historical documents, the Homestake adit meets with the Adit 1 drift workings 115' <br /> from the Adit 1 entrance. The Adit 1 workings were rehabilitated in 1982 but due to the size, <br /> the drift workings were not used and the Homestake Adit was cut for access. <br /> The Homestake adit was a very expensive cut for its time and there was a water mitigation <br /> system installed under the rails. This consisted of two 12"pipes and two 2.5-inch air lines that <br /> were dug in under the rail lines. There is also a 5"fresh air pipe that was installed in the drift. <br /> The goal of the mitigation system installed by Homestake was that if there was any water that <br /> drained from the mine, it would run under the tracks and out of the mine. <br /> Documents from USGS, Colorado Historical Society, and various other sources stated that in <br /> 1989 or 1992, Homestake Mining decided to-mothball the project after maintaining the <br /> workings since 1982. They installed steel doors and then backfilled 20'of material into the <br /> portal, blocking any unauthorized access. <br /> Gold Rush Expeditions,Inc.• <br /> 385-218-2138IgoldrushDgoldrushexpeditions.com -331 Rio Grande Street,Suite 201,Salt Lake City,Utah84101 <br />