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 and Steeple Rock district to the southwest. New Mexico Mines Database of Mines and Districts with Alunite Occurrences (McLemore, 1993, 2017).
Identified resources Identified resources of aluminum (alunite).
Production Unknown.
Status Recent drilling.
Estimated resources Hall (1978) estimated a potential alunite resource of 60 million tons with 30% alunite for strongly silicifled, locally alunitized Tertiary volcanic rocks at the extreme northwest end of the Steeple Rock mining district.
Geologic maps McLemore (1993), scale 1:12,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Acid-sulfate alteration, original host rhyolite, could have structural control.
Deposits Saddleback Mountain occurrence (MRDS dep_id: 10062631), Goat Camp Canyon occurrence (MRDS dep_id: 10014597).
Evidence from mineral occurrences MRDS; New Mexico Mines Database (McLemore and others, 2005).
Geochemical evidence As much as 42% Al2O3 (McLemore, 1993).
Geophysical evidence None.
Evidence from other sources New Mexico Mining and Minerals Division mine permits.
Comments NMBGMR has drill core and some chemical data. These acid sulfate altered areas have been known because of their implications in porphyry Cu exploration; however, they are best modeled as paleo-geothermal systems (hot springs). Anomalous Au, Ga and other elements are found in these areas. Detailed alteration mapping coupled with mineralogy and geochemistry are critical in understanding these systems and determine if they are potential resource for alunite (Al), Au, Ga, Ge, and other critical elements.
Cover thickness and description Variable.
Authors 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.