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Mineral resource potential map of the Benton Range Roadless Area, Mono County, California

Miscellaneous Field Studies Map 1317-C

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Abstract

Tungsten-bearing rocks in the Benton Range Roadless Area occur in tactite lenses within the Paleozoic metasedimentary units that surround and are intruded by Triassic granodiorite of the Benton Range. High anomalous tungsten values were found in the southern part of the study area. Quartz-vein deposits with copper, lead, zinc, and silver may occur within the Jurassic granitic rock in the northwestern part of the area.

Stream-sediment and panned-concentrate samples from the northwestern part of the roadless area, reveal anomalous values in a number of elements. Some of these elements are indicative of mineral suites that form by hydrothermal alteration and are potential metallic-ore producers. Metals having anomalous values are antimony, copper, lead, molybdenum, tin, and zinc; their presence suggests the potential for deposits of the lead-zinc-silver or copper-molybdenum type.

Molybdenum and lead were identified by geochemical sampling as having low to moderate potential in the roadless area.

An estimated 190,000 tons (172,000 t) of subeconomic gold and silver resources are inside the roadless area at the Gold Crown, Gold Webb, and Gold Wedge mines; another 60,000 tons (54,000 t) of subeconomic gold and silver resources are just outside the area at the Tower, Gold Webb, and Gold Wedge mines (table 1). Most of the lode gold and silver deposits are in quartz veins and shear zones. Minor amounts of copper, lead, and zinc occur in some gold deposits. About 2,240 oz (70 kg) of gold, 8,450 oz (260 kg) of silver, and 4,600 lb of lead (2,090 kg) have been produced from the roadless area. In addition, 7,257 oz (226 kg) of gold and 350 oz (11 kg) silver were produced at the Tower mine, near the area.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Mineral resource potential map of the Benton Range Roadless Area, Mono County, California
Series title:
Miscellaneous Field Studies Map
Series number:
1317
Chapter:
C
Year Published:
1983
Language:
English
Publisher:
U.S. Geological Survey
Description:
Report: 7 p.; 1 Plate: 33.60 x 25.12 inches
Country:
United States
State:
California
County:
Mono County
Other Geospatial:
Benton Range Roadless Area
Datum:
National Geodetic Vertical Datum of 1929
Scale:
62500