At the Aranzazu mine, the mineralized skarns occur adjacent to portions of the intrusive complex with intense stockwork veining of quartz, orthoclase and sericite in some areas. Skarn mineralization in the historic Aranzazu area occurs on the margin of a large, orthoclase, secondary biotite and sericitealtered, iron-stained zone. Several other areas of strong iron-staining, mineralized skarn, or mineralized veins and chimneys, occur throughout the area and have not yet received systematic exploration.
The Aranzazu mine consists of the originally mined Arroyos Azules area, the historical, past producing El Cobre area, and more than two kilometres of mineralized strike in a copper-gold-silver skarn deposit, plus significant advanced-stage exploration targets. This land package covers approximately 11,380 hectares and hosts a large copper resource with significant concentrations of gold and silver.
The drill holes used in the Mineral Resource estimate total 195,004 m of drilling in 1,210 drill holes.