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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

levels sampled.

iii

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