Au and Ag, the presence of colloform silica texture was the variable with the greatest
importance, i.e., the variable that has the greatest predictive power.
Boiling features are absent or rare in samples collected along a traverse
perpendicular to the Veta Madre. This suggests that if an explorationist observes these
features in samples collected during exploration that an environment favorable to
precious metal mineralization is nearby. Similarly, good evidence for boiling is observed
in the deepest levels of the Veta Madre that have been sampled in the mines and drill
cores, suggesting that additional precious metal reserves are likely beneath the deepest