Triumph sedex mineral system

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

Information leading to the delineation of this focus area

Basis for focus area Warm Springs mining district outline.
Identified resources Identified resources of cadmium, lead, silver, and zinc. Historical production of copper, gold, lead, silver, and zinc.
Production Triumph, Independence, and North Star mines production (1883-1967): 2,156,672 t ore containing 100,981 oz Au, 16,946,680 oz Ag, 4,456,722 lbs Cu, 190,732,742 lbs Pb, and 226,705,388 lbs Zn (Mitchell, 1997b). Hoodoo mines (1973-1977): produced 200,000 to 300,000 st of ore @ 7% Zn, 0.5% Pb, and 0.9 oz/st Ag.
Status Past mining; Triumph mine in reclamation and is a USEPA and State site of long-term concern under CERCLA (in 2020).
Estimated resources Triumph mine (1989): 41,000 mt ore @ 10% Zn, 6% Pb, and 206 g/t Ag. Hoodoo mines (1978): 78,900 mt ore @ 11% Zn, 0.47% Pb, 11.9 g/mt Ag, and 0.08% Cd.
Geologic maps Turner and Otto (1995), scale 1:45,700; Worl and Johnson (1995), scale 1:250,000; Link and others (1995), scale 1:100,000; Batchelder and Hall (1978), scale 1:24,000.
Geophysical data See McCafferty and Abrams (1991), scale 1:250,000.
Favorable rocks and structures Deposits are in complex fracture and fissure zones that cut sedimentary rocks of the Wood River Formation and intrusive rocks of the Idaho batholith.
Deposits Triumph mine (MRDS dep_id: 10103877), Hoodoo mines (Upper, Middle, Lower) (MRDS dep_id: 10071008).
Evidence from mineral occurrences MRDS.
Geochemical evidence Triumph mine reclamation (2019): Contaminants of concern (COCs) for the site are Sb, As, Cd, Cu, Ph, Mn, Hg, Ni, Se, Ag, V, and Zn; see Malcolm and Smith (1991). Stream sediment geochemistry in Fisher and Johnson (1995) and Smith (1995).
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments Refractory ores mined after 1915 at the North Star mine were high in Zn and locally enriched in Sb. Antimony was problematic for flotation of Pb and Zn and not recovered. Arsenic was more abundant than Sb in this district. Triumph mine closed in 2015; reclamation was completed in 2020. Arsenic, Pb, Mn, and Cd were the principal commodities of concern (Carpenter, 2019).
Cover thickness and description Veins exposed at the surface.
Authors Virginia S. Gillerman, Reed S. Lewis, Christopher A. Tate, Jane M. Hammarstrom.
New data needs High resolution geophysics, lidar.
Geologic mapping and modeling needs New mapping not requested at this time.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar in progress over southern portion of the focus area; needed elsewhere.