The 3M Corona plant is located on a site that is rich in history for our local community. Historically, the Butterfield Overland Stagecoach passed through the site on its route to deliver the mail between San Francisco and St Louis.
This location has been an active mine site for over 100 years. In 1941, 3M acquired the site from the Blue Diamond Company. Blue Diamond operated a quarry that produced concrete aggregates, but the mine was abandoned when its plant was destroyed by fire in 1928. 3M Corona began operations in 1948 in response to the postwar building demand and processed its first dacite porphyry rock on this site along the Temescal Canyon.
The rock quarried at this site is a hard trap rock which is blue-black in color flecked with white. It has the toughness and durability to withstand maximum weathering effects.
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