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AA a a <br /> SPECIAL CATEGORIES OF MINING—Rules 4.22 through 4.27: <br /> The highwall miner continues operation within the Collom Gulch.A lift has been created along the west facing <br /> slope of the Collom Gulch to allow the highwall miner to reach the upper seam of coal within the gulch.All <br /> previous areas mined with the highwall miner have been backfilled. <br /> Highwall miner. <br />