Saddleback Mountain-Goat Camp (and Steeple Rock 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 Focus area based on Saddleback Mountain alunite deposit. Fluorite mines overlap this area and continue into the Steeple Rock district to the southwest.
Identified resources Identified resources of gold and silver; historical production of copper, fluorite, gold, lead, manganese, silver, and zinc.
Production Between 1880 and 1993, the Steeple Rock district is estimated to have produced 151,000 oz (4.7 million grams) Au, 3.4 million oz (106 million grams) Ag, 1.2 million lbs (1.5 million kg) Cu, 5 million lbs (2.3 million kg) Pb, and 4 million lbs (1.8 million kg) Zn (McLemore, 1993). In addition, 10,000 tonnes of fluorspar and 1,800 tonnes of ore containing 33,800 kg Mn were also produced (McLemore, 2001).
Status Past mining. Recent exploration for Au, Ag; mines being permitted.
Estimated resources In 1992, reserves at the Summit vein (Steeple Rock district) were estimated as 1.3 million tonnes of ore grading 6.14 ppm Au and 35.2 ppm Ag (McLemore, 2001).
Geologic maps McLemore (1993), scale 1:12,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Fluorite hosted in fissures and veins in volcanic rocks and could be associated with late-stages of localized epithermal systems (McLemore, 1993). Manganese occurs as a byproduct in fluorite mines and locally as veins cutting volcanic rocks. Zinc associated with numerous base metal veins in district.
Deposits Mohawk Fluorspar mine (MRDS dep_id: 10013277), Bitter Creek mine, Daniels Camp 1 & 2.
Evidence from mineral occurrences MRDS; New Mexico Mines Database (McLemore and others, 2005).
Geochemical evidence As much as 44.8% Al2O3 (see McLemore, 1993). Weak As anomalies (> 20 ppm) associated with some deposits in the area. Ore shipments reported to contain, on average, 90 ppm As, 190 ppm Sb, and 150 ppm Bi. Surface samples from Alabama Au-Ag mine contain 6 to 24 ppm Ga (average 10.6 ppm; McLemore, 1993). Steeple Rock included in mining districts in New Mexico with reported Te-bearing minerals or with >20 ppm Te in analyzed samples (McLemore, 2016, 2018a).
Geophysical evidence None.
Evidence from other sources New Mexico Mining and Minerals Division mine permits.
Comments Localized acid alteration in Steeple Rock potentially associated with magmatic fluids, with pre-mineral and post-mineral epithermal mineralization (McLemore, 1993). Drill core available at the NMBGMR. More data required to test for potential enrichment of Ga, Ge, and In and abundance of K2SO4.
Cover thickness and description Variable.
Authors Joshua M. Rosera, Virginia T. McLemore.
New data needs Detailed alteration mapping, chemistry, mineralogy, geophysics.
Geologic mapping and modeling needs Digitize dissertation map of McLemore (1993), alteration mapping.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete.