Mendenhall Valley, Juneau Mendenhall Valley, Juneau The Mendenhall Valley (historically Mendenhall, colloquially The Valley) is the drainage area of the Mendenhall River in the U.S. state of Alaska. The valley contains a series of neighborhoods, comprising the largest populated place within the corporate limits of the City and Borough of Juneau, Alaska's capital. The valley was formed by Mendenhall Glacier over the course of roughly three thousand years. It was named for physicist and meteorologist Thomas Corwin Mendenhall. The Mendenhall Valley begins ten miles from the downtown area, at the intersection of Egan Drive and Glacier Highway, and ends ten miles farther west
Juneau gold belt fissure fillings of the area are comparable with the California "mother lode" deposits. Most of the gold mines in the Juneau belt occur in the band of black slate which lies between the schists to the northeast and the greenstones to the southwest. "The complex of veins which follow this black slate is described as the main lode system of the Juneau belt." "Parallelism of vein systems and ore deposits with the outcrops of bed-rock formations...is one of the noteworthy characteristics of the district." This results in a "linear distribution of the mines." Most of the gold deposits are found