Ken Clifford, PhD


Dr. Clifford attended the University of Utah in 1960 and from 1963 through 1970. He received his B.S. in Metallurgical Engineering in 1967 and PhD in Metallurgy in 1971.

From 1970 to 1972 he taught Mineral Processing and Coal Preparation at the University of Missouri at Rolla as Assistant Professor.

He joined St. Joe Minerals Corporation in 1972 as Assistant Director of Metallurgical Research. He gained practical mill experience as Mill Metallurgist of the Viburnum Mill in 1973 and more as Director of Metallurgical Research over the Viburnum, Fletcher, Brushy Creek and Indian Creek mills from 1974 through 1976. He managed bench and plant testwork to optimize lead, zinc and copper recovery and concentrate grades. Ken gained the equipment manufacturer’s perspective managing innovative filtration and thickening research and development. He also sized equipment for copper, uranium and coal clients from 1976 to 1978 with EIMCO.

From 1978 to 1980 Dr. Clifford managed the Coal Cleaning program at the Electric Power Research Institute. After generating $15 million for the Coal Cleaning Test Facility, he headed the site selection and EPCM contractor selection.

From 1980 to 1987 Dr. Clifford served as Chief Metallurgist with Chevron Resources in San Fancisco. His responsibilities included acquisition assistance and metallurgical testing coordination of PGM, silver and gold properties. This included the development of Stillwater PGM Resources in Montana and Phosphate expansion at Vernal Utah from 50 to 1000 tph. Ken spent a year as a financial analyst including evaluating the Net Present Value of the Pittsburg and Midway Coal Company acquired with the Gulf merger.

From 1987 to 1989 Dr. Clifford was General Manager of Golden Bear Operating Company, a joint venture between Chevron Resources and a Canadian mining company who sold their interest to Homestake Gold. This included permitting discussions with the Provincial government, building a 110-mile road in 8 months in northwest BC, moving a 110 man camp, mine development, and engineering for the roaster-cyanide leach flowsheet.

From 1989 through 1994 Ken conducted evaluations and operating improvement projects with Kennecott as Sr. Staff Metallurgist. He especially enjoyed mill assignments at Timmins, ONT milling Flambeau copper ore, Greens Creek AK mill audit and Knelson concentrator testing, and KUC molybdenite circuit flotation evaluation.

Since 1994 Ken has consulted with Rio Grande Mining on the Shafter mine currently being brought into production in Texas. He has also evaluated the Gold Hill mining area in Utah and Minas de Oro mining property in Honduras. Dr. Clifford has visited mines in US, Canada, Europe, South America, and Australia to determine mining and milling practice.

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