History of Wheal Trenwith |
| (Henwood, 1843).
"Pitch-blende occurs in great abundance among the copper ores of Wheal Trenwith, and was long carefully collected, and thought to be black copper ore. The low prices obtained for the ores with which it was mixed, and the inferiority of the metal they yielded, equally disappointed the miner and the copper-smelter; until a specimen of the copper was examined by Mr. Michell of Calenick, and found mixed with uranium in a metallic state. The ores were then inspected, and pitch-blende being discovered among them, its nature and prejudice to the copper ores were explained to the workmen, by whom it has been, of course, since rejected. Was there ever an instance in which an acquaintance with Mineralogy and Chemistry would have been more useful ?" The New York Times carried the headline "HEAP OF RUBBISH IS RICH IN RADIUM; BATHS MAY BE STARTED Medical Value of the Mineral Found in Pitchblende at St. Ives Is Now Recognized"
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