Antimony district

Region West, Southwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Outline of Antimony district from Krahulec (2018b).
Identified resources Historical production of antimony.
Production 105,000 tons of Sb (Mills and Rupke, 2020).
Status Past mining.
Estimated resources A subeconomic Inferred resource is based on the channel samples near the old mines of about 14 million tons at an average grade of 0.75% Sb (Krahulec, 2018b).
Geologic maps Callaghan (1973), scale 1:125,000; Biek and others (2015), scale 1:62,500.
Geophysical data Inadequate Rank 4 aeromagnetic coverage.
Favorable rocks and structures Paleocene limey sandstones of the Flagstaff Formation.
Deposits Emma-Albion mine (MRDS dep_id: 10154639).
Evidence from mineral occurrences MRDS; UMOS (Utah Geological Survey, 2021).
Geochemical evidence The average grade from 486 U.S. Bureau of Mines channel samples is 0.79% Sb, although a 500 lb mine dump sample had 3.7% Sb, 600 ppm As, 4.1 ppm Ag, and 79.2% SiO2 (Krahulec, 2018b).
Geophysical evidence Unknown.
Evidence from other sources Krahulec (2018b), Mills and Rupke (2020).
Comments Utah's most significant Sb producer on the flank of the geologically and mineralogically diverse and rich Marysvale area, one of the only Carlin-style deposits in the transition zone from Basin and Range to Colorado plateau province. Very little modern research or exploration.
Cover thickness and description No cover; additional resources may be present below volcanic rocks.
Authors Albert H. Hofstra.
New data needs Regional geologic interpretation tying this system into the regional geology.
Geologic mapping and modeling needs Map digitization.
Geophysical survey and modeling needs None requested at this time.
Digital elevation data needs Lidar complete over western half, in progress over remainder.