- More information: National Geologic Map Database Index Page (html)
- Document: Report (4.26 MB pdf)
- Larger Work: This publication is Chapter H of Contributions to economic geology, 1958
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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.
|Publication Subtype||USGS Numbered Series|
|Title||Manganese deposits in the Drum Mountains, Juab and Millard Counties, Utah|
|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|
|County||Juab County, Millard County|
|Other Geospatial||Drum Mountains|
|Google Analytic Metrics||Metrics page|