“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Ajo in Pima County, Arizona — The American Mountains (Southwest)

The Ajo Mining District

The Ajo Mining District Marker image. Click for full size.
By Bill Kirchner, May 12, 2010
1. The Ajo Mining District Marker
Inscription. Americans first worked the copper deposits at Ajo in 1854, one year after the Gadsden Purchase. These early American miners found abandoned workings and crude mining tools as mute evidence of earlier mining in the district.

During the next half century mining was confined to veins and other small bodies of high grade copper ore. Some ore was transported by mule train across the desert to Yuma for shipment to smelters in Swansea, Wales. Much of the mineralized ground in the district was staked for mining claims and several mining companies were formed.

An intensive diamond drilling campaign started in 1911 proved the existence of a large body of low grade copper ore and resulted in the construction of a leaching plant by the New Cornelia Copper Company for treatment of the ore. The plant went into operation in May, 1917 and initiated large scale exploitation of the land copper deposits.
Location. 32° 22.339′ N, 112° 51.753′ W. Marker is in Ajo, Arizona, in Pima County. Marker is on La Mina Avenue, on the right when traveling north. Touch for map. Marker is at or near this postal address: 111 La Mina Avenue, Ajo AZ 85321, United States of America.
Other nearby markers. At least 3 other markers are within 2 miles of this marker, measured as the
The Ajo Mining District Marker image. Click for full size.
By Bill Kirchner
2. The Ajo Mining District Marker
This marker is mounted on the right side of the flag pole base.
crow flies. The City of Ajo (here, next to this marker); The Mine Manager's House (approx. half a mile away); Old Clarkston Cemetery (approx. 1 miles away).
More about this marker. Marker is mounted on the base of the flagpole in front of the Pima County Building known as the G.T. "Tom" Alley Courthouse
Also see . . .
1. Photo of the Cornelia Mine Open Pit. Although this photograph may appear to be a small pit mine as photographed from the air, it is actually a pit mine that is about a mile wide and just over a thousand feet deep and was photographed by astronauts orbiting the Earth on board the International Space Station. (Submitted on May 18, 2010.) 

2. New Cornelia Mine. A Wikipedia article on the Open pit mine. (Submitted on May 18, 2010.) 
Categories. Industry & CommerceNatural ResourcesNotable Places
Pima County Building image. Click for full size.
By Bill Kirchner
3. Pima County Building
Plaque mounted on the front of the flagpole base
Pima County Building
Ajo, Arizona
Erected 1949 - 50
Board of Supervisors
J. Homer Boyd
G. T. Alley
Lambert Kautenburger
D. O. Norton & Son
Blanton & Cole
Credits. This page was last revised on June 16, 2016. This page originally submitted on May 17, 2010, by Bill Kirchner of Tucson, Arizona. This page has been viewed 810 times since then and 9 times this year. Photos:   1. submitted on May 17, 2010, by Bill Kirchner of Tucson, Arizona.   2, 3. submitted on May 16, 2010, by Bill Kirchner of Tucson, Arizona. • Syd Whittle was the editor who published this page.
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