Aguia Resources says it has improved ore quality at its Santa Barbara gold project in Colombia after changing its underground mining approach. Multiple outlets report that the company has lifted gold “head grades” to about 12 grams per tonne (g/t) following a switch to narrow-vein mining. The reports describe the change as a operational “tune-up,” indicating that the revised method targets smaller, narrow structures rather than broader styles of extraction previously used. Each source focuses on the magnitude of the reported grade jump and links it directly to the mining strategy adjustment. The articles do not provide additional, outlet-specific details on timing, production rates, costs, or how the change affects recoveries beyond the stated grade outcome. Overall, the coverage is consistent in attributing the improvement to the narrow-vein underground strategy and in citing the same approximate head-grade figure.