Southern Basin and Range VMS

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

Information leading to the delineation of this focus area

Basis for focus area Polygons extracted and merged from National Assessment tract SB25 (U.S. Geological Survey National Mineral Resource Assessment Team, 2000). Previously categorized as Massive sulfide, Kuroko.
Identified resources Identified resources of copper, gold, lead, silver and zinc. Historical production of copper, gold, lead, silver, and zinc.
Production Iron King (1906-1964): 8,700 metric tons Cu, 330,000 metric tons Zn, 114,000 metric tons Pb, 562,000 troy oz Au, 16,860,000 troy oz silver; Old Dick-Bruce: 49,000 metric tons Cu, 139,000 metric tons Zn, 13,700 metric tons Pb, 3,000 troy oz Au, 600,000 troy oz Ag; United Verde (1883-1975): 1,330,000 metric tons Cu, 24,000 metric tons Zn, 1,300,000 troy oz Au, 48,300,000 troy oz Ag; Antler (1916-1970): 2,000 metric tons Cu, 5,000 metric tons Zn, 770 metric tons Pb plus Au and Ag.
Status Past mining, active interest (New World Resources Antler Copper Project). The USEPA is conducting a comprehensive investigation of the Iron King site.
Estimated resources United Verde: remaining resource is part of a larger resource of 153,000,000 short tons with grade estimated at 0.01 to 0.015 opt Au, 0.5 to 1.0 opt Ag, 0.5 to 1.0% Cu, 2 to 4% Zn, and trace Pb. Antler deposit: remaining resources include an estimated 187,000 metric tons Zn. Kay deposit: remaining resources include an estimated 163,000 metric tons Zn.
Geologic maps Arizona Bureau of Mines (1958), scale 1:375,000; Wilson and others (1959), scale 1:375,000.
Geophysical data Inadequate Rank 5 aeromagnetic and Rank 3 aeroradiometric coverage.
Favorable rocks and structures Marine felsic to intermediate volcanic rocks of known volcanic-arc association appear to occur only in the Proterozoic rocks of the Yavapai, Mohave, and Mazatzal terranes in Arizona's Transition Zone.
Deposits Iron King mine (MRDS dep_id: 10045115), United Verde mine (MRDS dep_id: 10109023), Old Dick mine (MRDS dep_id: 10027598), Antler (MRDS dep_id: 10186198), Kay (MRDS dep_id: 10186398).
Evidence from mineral occurrences MRDS; Long and others (1998).
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments The United Verde deposit is approximately five times larger than the next larger deposit in Arizona, the Iron King mine, and 22 times larger than the Old Dick-Bruce mine. Two smaller deposits are Binghamton and Antler. Of the 41 deposits and occurrences listed by Donnelly and others (1988), more than half had production of less than 5,000 metric tons of ore.
Cover thickness and description Mineralization often exposed at the surface.
Authors Allen K. Andersen, Deborah A. Briggs.
New data needs Geochemistry, geophysics, geologic mapping.
Geologic mapping and modeling needs Detailed geologic mapping.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and radiometric surveys.
Digital elevation data needs Lidar incomplete over most of the large focus area.