Gangue mineral textures and fluid inclusion characteristics of the Santa Margarita Vein in the Guanajuato Mining District, Mexico

A newly discovered gold-silver vein, the Santa Margarita, parallel to the Veta Madre in Guanajuato's historic mining district, contains exceptionally high grades of up to 249 g/t Au and 2,280 g/t Ag. This study identifies distinct gangue mineral textures and fluid inclusion characteristics that correlate with high mineralization potential. Fluid inclusions in rich samples exhibit temperatures between 184–300°C and salinities up to 5 wt.% NaCl, while barren samples show lower salinity (≤3 wt.%). Evidence of boiling, particularly vapor-rich inclusions linked to intense 'flashing,' strongly correlates with high gold grades, offering a robust exploration tool for identifying economically viable targets in epithermal deposits.

Moncada, D., & Bodnar, R. (2012). Gangue mineral textures and fluid inclusion characteristics of the Santa Margarita Vein in the Guanajuato Mining District, Mexico. Open Geosciences, 4(2), 300–309. https://doi.org/10.2478/s13533-011-0057-8