The Ernest M. Clayton Photographs consist of 40 (3 inch x 4 inch) glass plate negatives showing the construction of buildings at the Inspiration Mill, the International Smelter, and the Miami Power Plant in Miami, Arizona. The images were made by Clayton, an electrician who worked on these construction projects, between 1902 and 1915.
An EAD guide to this collection can be accessed at Arizona Archives Online.

Unidentified interior with machinery.

Unidentified interior with machinery.

Interior view of Inspiration Mill showing equipment. The original negative displays severe fading, which has significantly reduced image quality.

Interior view of Inspiration Mill. The original negative displays severe fading, which has significantly reduced image quality.

Exterior view of the roaster and conveyors at an International Smelter Co. facility.

Exterior view of the main building at the International Smelter Co. facility in Miami, Arizona.

Exterior view of an International Smelter Co. roaster including adjacent structures, train tracks, and an El Paso & Southwestern boxcar.

Interior view of an International Smelter Co. facility showing bedding bins and a conveyor belt.

View of buildings and equipment at Inspiration Camp.

Unidentified interior with machinery.