University of Missouri-Rolla

School of Mines and Metallurgy

Department of Geology and Geophysics


Educating Tomorrow's Leaders
in the Geological Sciences


Richard D. Hagni

Curators' Professor and Chairman

Ph.D., 1962, University of Missouri-Columbia

M.S., 1954, Michigan State University

B.S., 1953, Michigan State University (BSc)


Department of Geology & Geophysics, University of Missouri-Rolla, Rolla, Mo. 65409-0410


125 Mcnutt Hall


(573) 341-4657


(573) 341-6935




Volume Contains
28 Papers
in 412 Pages

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Studies on Ore Deposits, Mineral Economics,
and Applied Mineralogy: With Emphasis on
Mississippi Valley-type Base Metal and
Carbonatite-related Ore Deposits

Click Here for More Information


Richard D. Hagni has taught and conducted research at the University of Missouri-Rolla since 1956. He received his B.S. and M.S. degrees from the Michigan State University in 1953 and 1954; the Ph.D. degree from the University of Missouri-Columbia in 1962. He is an economic geologist with interests in a wide variety of ore deposits, both domestic and abroad. Although he is interested in all aspects of ore deposits, he especially emphasizes the application of ore microscopy and related techniques (SEM-EDS, EPMA, cathodoluminence microscopy, infrared microscopy, and fluid inclusion studies) to the study of ore deposits. He teaches more courses in ore microscopy than anywhere in the United States: Ore Microscopy, Advanced Ore Microscopy, and Applied Ore Microscopy. His course on Ore Deposition involves the principles of how ore deposits are formed, but especially features well-illustrated lectures on ore deposits that he has visited throughout the world. His Advanced Ore Microscopy course includes the involvement with the ore microscopy of advanced ore suites, quantitative Vickers Hardness measurements, reflectance measurements to 0.1%, quantitative color determinations, fluid inclusion temperature and salinity measurements, cathodoluminescence microscopy, infrared microscopy, SEM-EDS, EPMA, Auger microprobe and ESCA. The ore microscopy laboratory at UMR is probably the only laboratory in the United States to have all four types of quantitative equipment: 1) Vickers Hardness, 2) reflectance, 3) rotation properties, and 4) precise color comparison bar. The polished section collections may be the most extensive in the United States, and include a large number of suites of polished sections of ores from throughout the world.

List of polished section suites studied in Ore Microscopy 312 and Advanced Ore Microscopy 412 - Table II.

Photomicrographs illustrating ore suites studied in Ore Microscopy, Geology 312

Photomicrographs illustrating ore suites studied in Advanced Ore Microscopy, Geology 412


The research interests of Richard D. Hagni lie in two major areas: 1) economic geology and 2) applied mineralogy. As an economic geologist, he has an interest in all aspects regarding ore deposits, primarily metallic ore deposits, but also non-metallic ones, especially fluorspar deposits. He is especially active in the application of ore microscopic and related microscopic techniques to the study of ore deposits to determine their mineralogy, ore textures, paragenesis, and genesis. He has been especially involved in studies of the Cu-Pb-Zn ores in the Viburnum Trend in southeast Missouri (one hour’s drive from Rolla). Current studies by Hagni and students working with him on those ores include the areal distributions of ore minerals abundances and grain sizes, studies of galena morphological variations, determinations of trace element contents (especially silver) in pyrite and marcasite, sulfide mineral paragenesis, underground mapping of mineral zoning, ore microscopy of unusually fine-grain Pb and Cu ores, ore microscopy and trace element contents of the rare bornite ores. He has also has been actively involved in studies of copper shale and sandstone deposits in Oklahoma, iron deposits in Michigan, New York, Alabama, and Missouri, gold deposits in Nevada, silver deposits in Idaho, and massive sulfide deposits in New Hampshire and Maine. Recent studies have included mine mapping, ore microscopic, petrographic, cathodoluminescence microscopic, and geochemical studies of the carbonatite-related Okorusu fluorspar deposits in Namibia and the carbonatite-related Nb and REE deposit at Eldor in Quebec. Recently, he has visited the East African Rift in Kenya and Oldoinyo Lengai carbonatite volcanoe in Tanzania; field photographs of those geological features can be viewed by clicking that topic below. More recently, he has recently visited the carbonatite-related fluorspar deposits at Amba Dongar, India, and has plans to conduct research to compare those deposits to the similar deposits at Okorusu, Namibia.


Outline of Ore Deposition 489 and List of ore deposits discussed - Table I

Photomicrographs illustrating ore deposits discussed in Ore Deposition, Geology 489

East African Rift and Oldoinyo Lengai

Selected recent papers published on ore deposits


Hagni extends his ore microscopic studies to applications for the resolution of metallurgical, ceramic, and other important industrial problems. In this regard, he clearly has been more active than any other ore microscopist in the United States. Most of the case histories of applied ore microscopy dealt with in his Applied Ore Microscopy course have come from his personal industrial experiences. The application of ore microscopy to certain industrial problems commonly can serve to save millions of dollars for industrial firms. For 12 years, Hagni and students working with him served as the process mineralogy group in the Pyrometallurgical Research Center that was funded by the U.S. Bureau of Mines, headquartered at UMR, and conducted pyrometallurgical research throughout the United States.


Outline of Applied Ore Microscopy Course - Problem Suites - Table III

Photomicrographs illustrating ore suites studied in Applied Ore Microscopy, Geology 435

Selected recent papers published on applied mineralogy

Hagni held the Gulf Oil (Gulf Minerals) Chair at UMR from 1984 to 1992. He was named Curators’ Professor of Geology in 1993 and has held that Chair to the present time. He has served as the Chairman of the Department of Geology and Geophysics from 1985 to the present. Since 1986, he has served three terms as the Chairman of the Paragenesis Commission (PaC) of the International Association on the Genesis of Ore Deposits (IAGOD). He has served three terms as the Chairman of the Process Mineralogy Committee of AIME. Since 1990, he has served two terms as the Chairman of the Commission on Applied Mineralogy (CAM) of the International Mineralogical Association (IMA). He also has served in several offices, including Vice-president, of the International Council on Applied Mineralogy (ICAM). He is the author/editor of 22 books, published 149 papers and given 273 abstracted professional presentations.