Iron has been mined intermittently since the late 19th century.
Blue asbestos, discovered at Wittenoom in 1917, was mined intermittently during the 1930s and methodically after 1943; a plant for the extraction of the mineral fibre was built there in 1950, but asbestos mining was discontinued in 1966 because of high production costs.
Is that so very different from my belief that a good friend of mine who suffered intermittently from a conviction that he was responsible for the imminent outbreak of a third world war was born with an inherited liability to a psychological condition which has something to do with the region of chromosome 6?
Several mines were operated intermittently between the 1860s and 1962 for Au, Ag, Cu, Fe, Zn, and pyrite.
The Colt Mesa mine, pictured here in June, operated intermittently in the 1970s.
Played by Frederick Neumann — of Mabou Mines and Mr. Neumann's father — he is shown intermittently throughout the evening-length work on video, as he makes his way through nature.
On these wires, and on the hoops, mines, each the size of a Mars bar, were intermittently strewn.
The Stan Terg mine, part of the Trepca complex, in northern Kosovo, has been in operation intermittently since the Middle Ages.
Credit View full screen The Stan Terg mine, part of the Trepca complex, in northern Kosovo, has been in operation intermittently since the Middle Ages.
E-mail address GO SIGN UP Share Tweet The Stan Terg mine, part of the Trepca complex, in northern Kosovo, has been in operation intermittently since the Middle Ages.
