110 Linking Mineral Resources and the Geologic Framework of North America: The USGS Earth Mapping Resources Initiative (Earth MRI) and Related Activities (Posters)

Knowledge of the geologic framework and mineral resources is improving through new geologic mapping, airborne geophysics, geochemistry, and lidar acquisition, especially through Earth MRI. We welcome submissions of Earth MRI research and similar studies linking framework geology and mineral resources.

Monday, 20 October 2025
8:00 AM - 5:30 PM
HBGCC, Hall 1

Using Hyperspectral Imaging to Map Alterations in Arsenide Five-Element Veins System in Black Hawk District, Grant County, New Mexico

Paper number: 110-0
Program: Technical Sessions
Time: 8:00 AM – 8:00 AM

Authors

Abstract

Hyperspectral imaging is a tool to characterize alteration mineral assemblages that may point to mineralization. Hyperspectral imaging in the Long-Wave and Short-Wave Infrared regions was applied to 13 samples from Black Hawk district, which includes rare arsenide 5-element vein deposits in the U.S. These deposits are mineralogically complex, hydrothermal, structurally-controlled Ag-Co-Ni-Bi-As bearing carbonate veins. The variation in the reflectance ratio between the 9750 nm and 10700 nm bands was observed and correlates with the oxidation state of Fe-bearing silicates, distinguishing between Fe²⁺-dominated minerals and their Fe³⁺-altered counterparts. In addition, hyperspectral classification shows zones of high Sulfide–Oxide Index that correspond to patterns consistent with reduced, sulfide-rich environments. This suggests alteration involves redox reactions, followed by reducing conditions, which align with the geochemical conditions favorable for arsenide mineral precipitation. Integration of hyperspectral signatures with mineralogical and geochemical data enhances the understanding of alteration vectors and ore-forming processes in hydrothermal systems.

Geological Society of America Abstracts with Programs. Vol. 57, No. 6

doi: 10.1130/abs/2025AM-414667

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