Borax Smith's mine at Borate or Harmony, California, ca.1890-1900 

Twenty-mule team hauling borax in a wagon as seen from behind, probably in Mule Canyon, ca.1890 

"Borax" Smith's mine at Harmony, Death Vallley, ca.1890 

Twenty-mule team hauling borax in wagons from mines in Death Valley, ca.1890 

Borax Smith's 20-mule team hauling borax across the desert, Death Valley [?], ca.1890 

Sixteen-mule team hauling borax from old Borate, ca.1890-1900 

Traction steam engine hauling borax, ca.1900 

Twenty-mule team hauling borax out of Death Valley to the railroad, ca.1900 

Traction steam engine hauling borax, ca.1900-1904 

Mule team and loaded ore wagons at stamp mill, Mojave Desert, ca.1900 

Mule team and loaded ore wagons at stamp mill in desert, ca.1890-1892 

Man driving an 8-mule team transporting ore in two wagons in desert community, California, ca.1890-1892 

Interior of the ore house at Randsburg, ca.1900 

Salt stacks drying, California, ca.1910 

Large stack of salt being piled at a salt mine, California, ca.1910 

Two men standing among rows of salt stacks in the north end of Death Valley, 1910-1920 

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

A man driving a 14-mule team hauling wagons loaded with ore from the desert mines, California, ca.1905 

Brothers Jason and Owen Brown at their mining camp, San Bernardino Mountains, ca.1890 

A worker next to an olive mill, California, ca.1900