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The northwest part of the map, underlain by metamorphic and plutonic rocks, is dominated by sericitic alteration. Volcanic rocks southeast of La Cocolmeca Fault Zone are altered to propylitic or argillic assemblages. Potassic-sericitic assemblages are in some veins.

The northwest part of the map, underlain by metamorphic and plutonic rocks, is dominated by sericitic alteration. Volcanic rocks southeast of La Cocolmeca Fault Zone are altered to propylitic or argillic assemblages. Potassic-sericitic assemblages are in some veins.