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Judges measuring a drill hole at a mining competition
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1971
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Abstract
Judges measure a drill hole in the stone while the competitor watches ; the block has a sign reading "Morrison." Mining competition, Western Mining Conference & Exhibition.
Caption reads: "Colo. Mining Association Feb 6 1971" ; accompanied by a paper, "Mike MacKenzie, Boulder, Colorado, winner of the First Annual Single Jack Drilling Contest at the 73rd National Western Mining Conference and Exhibition."
Caption reads: "Colo. Mining Association Feb 6 1971" ; accompanied by a paper, "Mike MacKenzie, Boulder, Colorado, winner of the First Annual Single Jack Drilling Contest at the 73rd National Western Mining Conference and Exhibition."
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Copyright retained by Colorado Mining Association.