Mar. 14 -- There are deeper mines in North America than the Resolution mine but none with a single shaft this long. It is a 6,943 foot concrete barrel, 30 feet in diameter bored into the mountain of Arizona and took six years to dig. Bloomberg's Matt Philips journeys toward the center of the earth to check out this engineering marvel. (video by Adam Wolffbrandt)
In Metric, the shaft is 2116m deep, 9m diameter, and they were descending at a maximum rate of 150metres per minute, or 2.5m/s.