| Date | Text | |
|---|---|---|
13 Mar 1956
Daniel Cowan Jackling |
death Daniel Cowan Jackling Died 13 Mar 1956 at age 86 (born 14 Aug 1869). American mining engineer and metallurgist who founded the Utah Copper Company and with an economical method to process low-grade porphyry copper ores, below 2% copper. As electicity use expanded in the early 20th century, so demand for copper rose, and the need to exploit even low-grade ore. Such ore was obtained by open-pit mining then loaded by steam shovels into railroad cars and transported to concentrating mills. Jackling developed improved extraction/flotation processes to produce a higher-grade concentrate for smelting. By the time Jackling died, over 60% of the world's copper production took advantage of his low-grade ore processing methods. His Bingham Canyon Mine, now a huge pit, still produces copper. |
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