CEMEX Clayton #135

Clayton #135 is a quarry and crusher operation, producing an angular mineral aggregate called diabase.  Diabase is a hard and durable mineral with good shrinkage characteristics suitable for high-strength concrete. 

Quarry total output is approximately 300,000 to 400,00 tons per year and the supply is estimated at about 30 years.  The plant is located near the base of Mount Diablo in Contra Costa County.