The Montezuma Quadrangle, Summit County, Colorado
September 2003 by Matt PowellThe Montezuma mining district of Summit County, Colorado, is a rugged, structurally complex area of the Rocky Mountains. Home to the first silver claim in Colorado, the Montezuma district hosts stockwork gold deposits, disseminated molybdenum, and abundant silver-bismuth veins.
The first location we worked was a small, dry ravine cutting through many mineralized zones in an area where some hard rock mining had taken place in the past.
After picking up a large grey rock, ready to discard it, I immediately noted it was extremely heavy. My eyes started getting bigger and bigger as I wiped off the surface dirt and moistened it—the color yellow started showing.
Greenstone is a dark greenish-black basaltic rock which, along with chloritized schist, forms belts up to 50 miles wide in northern Minnesota, in rocks of Late Archean age. Most belts are 2.6 to 2.9 billion years old.
In 2005, my wife and I, along with our supervisor Horacio, made numerous business and supply trips from Arivechi, Sonora, to the capital of Sonora, Hermosillo. This is a distance of 135 miles along a very narrow paved mountain road.
The suction nozzle was one of the first Venturi nozzles to be used in the dredging business. Years later it was replaced with the straight Venturi system, which is sometimes referred to as a “log.” The main benefit of the log is that the operator only needs a suction hose with a short nozzle.
The Bawl Mill • Klondike Gold • State Rivers Closed to Prospecting in Washington • A Guide to Overlooked Gold Deposits—Part I • Looking for Gold in British Columbia • The Reynolds (Star) Gold Mine • Picks & Pans: Sniping for Low Stream Gold • Company Notes • Why Do We Do The Things We Do? • Gallium and Germanium in Utah • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices