Masters Theses


"This thesis deals with the geology of the Diamond No. 2 Mine east of Gallup, New Mexico. The sedimentary rocks ranging from Triassic to Cretaceous are described in relation to the local stratigraphic setting.

The Dakota formation is the host rock of the ore deposit, and was therefore studied in detail with regard to its petrographic nature and the sedimentary structures such as slumping. Special emphasis is placed on the study of the relationships between the uranium and vanadium deposit and the host rock. Geometrical and geochemical criteria are offered in order to explain the local genesis of the ore deposit at the Diamond No. 2 Mine. The geometric (textural, structural) evidence such as the lack of crosscutting relationships on one hand, and the abundance of congruent features readily explained as depositional sedimentary structures on the other hand, suggest to an originally syngenetic origin. The presence of tuffaceous matter lends probability to a volcanic and thus hypogene source of the uranium and vanadium minerals. Geo chemically there is no objection for a syngenetic explanation since the only alteration ("silicification") occurring adjacent to the ore bodies may be diagenetic and thus also syngenetic.

Later epigenetic supergene processes redistributed some of the uranium in form of camotite (camotitization) and caused later alterations such as limonitization, jarositization, etc. The field observations are presented on 33 figures and 12 plates (mostly maps and cross sections)* A special, probably partly- new mapping method was used successfully for the mapping of 60,000 square feet of mine walls at the scale of 1" to 20V"--Introduction, page 9.


Amstutz, G. C. (Gerhardt Christian), 1922-

Committee Member(s)

Christiansen, Carl R., 1921-1997
Proctor, Paul Dean, 1918-1999
Spreng, Alfred C., 1923-2012


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology


Plate #3 is missing.


Missouri School of Mines and Metallurgy

Publication Date



125 pages

Note about bibliography

Includes bibliographical references (pages 119-124).

Geographic Coverage

Gallup, New Mexico


© 1959 Raymundo J. Chico, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Geology -- New Mexico
Uranium ores -- New Mexico
Vanadium ores -- New Mexico
Uranium mines and mining -- New Mexico

Thesis Number

T 1198

Print OCLC #


Electronic OCLC #


Chico_Raymundo_1959_Plate_1.tif (42116 kB)
Surficial Geological map, Diamond No. 2 Mine area, Nutria Monocline, Gallup, McKinley County, New Mexico. Scale 1”:500’

Chico_Raymundo_1959_Plate_2.tif (37057 kB)
Geological Section A-B Nutria Monocline. Scale l”:200’

Chico_Raymundo_1959_Plate_3.TIF (121876 kB)
Descriptive stratigraphic column of the Nutria Monocline, Gallup, New Mexico

Chico_Raymundo_1959_Plate_4.tif (41918 kB)
Outcrop Geology - Diamond No. 2 Mine. Scale 1”:20’

Chico_Raymundo_1959_Plate_5.tif (81829 kB)
Vertical projection of Diamond No. 2 Mine, Mike Smith and Largo orebodies, showing the ore content

Chico_Raymundo_1959_Plate_6.tif (59335 kB)
Geology of 400 Level, Diamond No. 2 Mine. Scale 1”:20’

Chico_Raymundo_1959_Plate_7.tif (61879 kB)
Geology of 425 Level, Diamond No. 2 Mine. Scale 1”:20’

Chico_Raymundo_1959_Plate_8.tif (54312 kB)
Geology of 450 Level, Diamond No. 2 Mine. Scale 1”:20’

Chico_Raymundo_1959_Plate_9a.tif (52071 kB)
Geology of 500 Level, Diamond No. 2 Mine. Scale 1”:20’ (first part)

Chico_Raymundo_1959_Plate_9b.tif (69814 kB)
Geology of 500 Level, Diamond No. 2 Mine. (Continuation of first part) Scale 1”:20’

Chico_Raymundo_1959_Plate_11.tif (71714 kB)
Interpretation: % e U₃O₈ in D167 Hole Becenti Orebody

Chico_Raymundo_1959_Plate_10.tif (23763 kB)
Gamma Log of D167 Hole, Becenti Orebody

Chico_Raymundo_1959_Plate_3.tif (51726 kB)
Contour map of the combined value ore grade x thickness Becenti Orebody. Scale 1”:30’

Included in

Geology Commons


Thesis Location