How do we get Blue John?
Blue John today is mined from two caverns in the Peak District; Blue John and Treak Cliff caverns. They sit in a complex of caverns beneath the rolling hills that lie in Derbyshire, Staffordshire and Cheshire. The caverns are a local tourist attraction in addition to being an active mine. Blue John is found in ganges, or veins, around 3 inches thick along the sides of the limestone caverns in rakes, scrins and pipes.
Blue John Veins in the Blue John Cavern. Photo Courtesy of Blue John Cavern.