DENVER

24-Hour Gritness

11/01/2010 05:12 am ET | Updated May 25, 2011








Leadville has seen rushes on gold, silver, lead, zinc, copper and even molybdenum. But the town's most recent rush may prove to be its most enduring: At 10,152 feet, the highest incorporated city in the U.S. has positioned itself as a mecca for high-altitude endurance athletes. Now

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