The mountain range has served as a destination for mine exploration for centuries, but with minimal commercial profit.
William Ascarza Special to the Arizona Daily Star The Tucson Mountains have served as a destination for mine exploration for centuries, but with minimal commercial profit.
People are also reading… Mining in the region increased across the Tucson valley to the east in the Santa Catalina Mountains in the 1880s, where prospectors explored the area based upon gold discoveries in the Cañada del Oro, also known as the Canyon of Gold. More than 15 miles long, this large ash-flow caldera is overlain by mid-tertiary basaltic andesite lavas on parts including those of Sentinel Peak, also known as “A" Mountain,” and Tumamoc Hill.
The Saginaw Hill Mine, named for financial investors from Saginaw, Michigan, is located on the southwest flank of the Tucson Mountains. Geologically it is a fissure deposit in rhyolite porphyry. In 1914, renowned geologist Ira Joralemon invested in the property, developing 10 million tons of copper ore including chalcocite and chalcopyrite. The mine circulated through many owners. High-grade silica copper ore was shipped from the mine to the Hayden smelter in 1958. The tailings were mined in the late 1980s with several shipments sent to the Arivaca Mill for gold extraction.
Lava flowsOther lava flows can be found throughout the Tucson Mountains, including those exposed at Tumamoc Hill and Sentinel Peak. These flows are composed of vesicular basaltic andesite with olivine inclusions that were mined for building stone in Tucson, still found in early home and business construction.
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