Manganese deposits in the Drum Mountains, Juab and Millard Counties, Utah

Bulletin 1082-H
By: , and 



The Drum Mountains are in west-central Utah 30 miles northwest of Delta, between the Sevier Desert on the east and Whirlwind Valley on the west. It is a typically barren desert range comprising a westward-tilted structural unit in which is exposed as much as 9,000 feet of quartzite (Cambrian and Precambrian?) and 3,000 feet of carbonate rocks of Cambrian age. These beds, which strike northward and dip west, are cut by myriad east- to northeast-trending faults with displacements of a few feet to a few thousand feet. Quartz monzonite dikes, pebble dikes, and vein deposits are present locally along the faults. The Cambrian rocks are overlain unconformably by volcanic rocks of probable Tertiary age.

Bodies of manganese carbonate ore were formed by replacement of two 20-foot beds of impure dolomite at the base of the sequence of carbonate rocks, along their intersection with certain preore faults. The feeding fissures locally contain veins in which rhodochrosite is associated with base metal sulfides. Downward- moving meteoric water has oxidized the ore bodies to a depth of 100 to 200 feet except where they are sealed off by structural or stratigraphic traps.

From 1925 to 1953, 72,462 long tons of manganese ore with an average grade of about 25 percent Mn were shipped.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Manganese deposits in the Drum Mountains, Juab and Millard Counties, Utah
Series title Bulletin
Series number 1082
Chapter H
DOI 10.3133/b1082H
Year Published 1961
Language English
Publisher U.S. Government Printing Office
Description Report: iv, 51 p.; 5 Plates: 21.87 x 22.85 inches or smaller
Larger Work Type Report
Larger Work Subtype USGS Numbered Series
Larger Work Title Contributions to economic geology, 1958
First page 493
Last page 544
Country United States
State Utah
County Juab County, Millard County
Other Geospatial Drum Mountains
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