Fluorspar History in Kentucky
Kentucky has played a central role in the history of fluorspar (fluorite) mining in the United States. The Illinois–Kentucky Fluorspar District, stretching across western Kentucky and southern Illinois, was once the nation’s leading source of fluorspar.
Early Discovery and Mining (1830s–1800s)
Fluorspar was discovered in western Kentucky in the early 1800s, with small-scale mining starting by the 1830s. Early production primarily supplied flux for local iron smelters.
Growth and Peak Production (1880s–1950s)
By the late 19th century, Kentucky had become the largest fluorspar-producing state in the U.S.The district produced metallurgical, ceramic, and acid-grade fluorspar, making it vital for steel, glass, and chemical industries.
The towns of Marion, KY and Rosiclare, IL became major mining hubs.
During World War II, Kentucky’s fluorspar industry was considered a strategic national resource, supporting aluminum refining and weapons production.
Decline (1960s–1990s)
After the 1950s, production began to decline because of:Depletion of easily mined reserves
Higher labor and operating costs in the U.S.
Growing imports from lower-cost producers like China and Mexico
By the 1990s, commercial fluorspar mining in Kentucky had effectively ended.
Legacy and Preservation (2000s)
The Ben E. Clement Mineral Museum in Marion now preserves Kentucky’s fluorspar heritage. It showcases historic mining equipment, archives, and one of the world’s largest collections of fluorite specimens from the district.
Present Day (2000s–Now)
While Kentucky no longer has large-scale commercial fluorspar production, the region remains an important part of American mining history.
Small-scale collecting, tourism, and museum exhibitions continue to keep the legacy alive, especially through the Ben E. Clement Mineral Museum in Marion.
The U.S. government has designated fluorspar as a critical mineral, which has led to renewed interest in developing secure domestic supply chains.
Although Kentucky itself is no longer a production hub, new U.S. fluorspar projects are underway:
CleanTech Vanadium Mining Corp. (CleanTech CTV) – A North American mining company focused on critical minerals, including fluorspar. CleanTech CTV is developing projects to support U.S. supply chains and reduce reliance on imports.
Ares Strategic Mining (Utah) – Currently advancing the only permitted fluorspar mine in the United States, working to bring large-scale production back domestically.
