Masters Theses


"A copper-prospect in south-central Arizona has been evaluated on a metallurgical basis. Primary chalcocite and secondary covellite, plus the copper oxides malachite and brochantite, constitute the economic mineralization. The deposit outcrops as a steeply dipping (70°SW), intensely brecciated, copper-bearing quartz vein with discontinuous lenticular ore shoots.

Acid leaching techniques alone and in conjunction with froth flotation utilizing four copper oxide specific collectors were used to evaluate the amenability of this ore to processing. Direct acid leaching was examined and found to be ineffective. Removal of the chalcocite by froth flotation with xanthate was easy and gave better results to subsequent leaching steps; the oxide phases of the ore proved more difficult to concentrate.

Copper oxide recovery was investigated using the following collectors and methods: 1) fatty acids (carboxylic acids); 2) potassium octyl hydroxamate; 3) monoalky ldithiocarbamates ; 4) sulphidation with NaHS plus xanthate collector; and 5) froth flotation plus acid leaching of tails. The carboxylic acid collectors produced extremely low recoveries. Potassium octyl hydroxamate and the monoalkyldithiocarbamate collectors gave recoveries of 93 pet or better. The hydroxamate is too expensive to utilize as a collector, while the carbamate is cheaper but not available in commercial quantities. Sulphidation with NaHS proved effective but hard to control without instrumentation; recoveries were typically in the 85 pet to 93 pet range. Froth flotation followed by acid leaching yielded recoveries up to 97 pet with moderate cost.

A proposed flowsheet would call for chalcocite flotation with potassium amyl xanthate (KAX) at a grind of -150 µm (-100 mesh) followed by sulphidation with NaHS and copper oxide flotation with KAX. Flotation tailings would then be given an agitation acid leach to recover the remaining copper values"--Abstract, pages ii-iii.


Clifford, Roger K.

Committee Member(s)

Morris, Arthur E., 1935-
Proctor, Paul Dean, 1918-1999


Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering


University of Missouri--Rolla Department of Metallurgical Engineering
University of Missouri--Rolla Department of Geology and Geophysics
United States Department of Education
United States Bureau of Mines


University of Missouri--Rolla

Publication Date



xii, 77 pages

Note about bibliography

Includes bibliographical references (pages 67-69).

Geographic Coverage

Pima County, Arizona


© 1979 Kevin Michael Kenney, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Metallurgy -- Arizona -- Pima County

Thesis Number

T 4545

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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