Carl Eytel and Van Buskirk with pack burros on their Colorado River trip with George Wharton James, ca.1900 

Desert prospector and his pack burro in the desert en route to the Peg Leg Smith Mine, Superstition Mountains, 1904 

Old mill used by miners at the Ten Stamps Mine, ca.1900 

Amalgamator at a mine on the Colorado River, California, ca.1900 

Miner's pack animals in front of mining supply stores, Goldfield, Nevada, ca.1900 

Interior view of Bagdad mine on the 90 feet level, California, ca.1900 

Mining hoist in the Rocky Mountains, Canada, ca.1900-1930 

Interior view of a mine (named Bagdad Mine?) belonging to the Rochester Gold Mining Co., Ludlow, California, ca.1900 

Four men at the Bucket & Windlass, a prospecting shaft, Hard Cash Mine, Randsburg, ca.1900 

Young Hopi Indian boy hugging a burro, ca.1900 

Prospector in the desert with horse and two burros, 1880-1910 

Interior view of mine and miners in the Mohawk Mine, Goldfield, Nevada, ca.1900-1905 

A miner using hydraulic mining techniques and tools to mine, Nevada City, California, ca.1900-1930 

Exterior view of the Consolidated Gold Mine in Mojave, ca.1900 

A train in front of a combination mine, Goldfield, Nevada, ca.1905 

Concentrator mill at a mine on the Colorado River, California, ca.1900 

Three miners, wearing prospector outfits, standing next to a burro cart loaded with camp supplies, Goldfield, Nevada, ca.1900-1905 

Exterior view of the Willow Springs Mine and Stage Station, Kern County, ca.1900 

Repacking burros after swimming across the Colorado River, Grand Canyon, ca.1900-1930 

"The last pull on the diamond hitch" -- two men packing a burro, ca.1898