In 1908 the richest producers of gold were Salt Lake (60,872.63 oz.), Juab (58,679.17 oz.) and Tooele (41,969.96 oz.) counties, which produced about nine-tenths of the total for the state; in Salt Lake and Juab counties the principal source was copper ore, but in Tooele county almost all the gold was from siliceous ores.
In the same year the largest producing gold mines were the Centennial Eureka in Juab county, the Mercur in Tooele county, and the Utah Consolidated and the Utah Copper in Salt Lake county.
Were from lead ore) were from Tooele county.
Zinc has been produced in commercial quantities in Summit, Tooele and Beaver counties.