The Yauli unit region shows mineralization related to polymetallic epithermal systems, replacement bodies and polymetallic vein systems, as well as porphyry mineralization and skarns, thus indicating the great potential of the area.

Andaychagua Vein is one of the producers in the San Cristobal district, is one of the most important veins on the southeast side of the Chumpe intrusive. The vein lies on the northeast side of the Chumpe Anticline* About three and a half kilometers southeast of the San Cristobal Vein system* The Andaychagma Vein strikes N 30° E and dips 85° northwest* The vein can be traced on surface for about four kilometers, three of which are in Mitu volcanic rocks and one of which in Excelsior phyHites. The structure continues on surface across the axial zone to the southwest side of the Chumpe Anticline, but only as a fault structure without apparent mineralization. The Andaychagua Vein carries sphalerite, galena, and silver minerals.

(Translated from Spanish by Google Translate)
Andaychagua is an underground mine, a part of Yauli unit.

There was an increase in the head grades of Zn in 20%, Pb in 21% and Cu in 23%, due to the planned contribution of the Salvadora mineralized body in production. However, there was a decrease in the Ag grade of 8% due to the lower contribution of the vein Puca Urco.

The Andaychagua mine is exploiting the Andaychagua vein using the Cut and Fill method. The mining cycle begins with drilling and blasting, extraction, and sustaining and ends with the retreating cemented filling could demand up to 3 months time for a mining panel up to 200 m.

Exploration with diamond drilling gave positive results, which allowed increase resources mainly in the body Prosperity Roof and improved the certainty in the Salvadora Norte and Andaychagua bodies.

The mining cycle begins with drilling and blasting, extraction, sustaining and ends with the retreating cemented filling could demand up to 3 months time for a mining panel up to 200 m. The current production of the mine amounts to 2,500 tons/day, of which 50% is contributed by the Overhand cut and fill method.

Andaychagua's processing plant include grinding circuit consist of primary ball mills #1, 2 (10.5 'x 14', 8 'x 10') and secondary grinding ball mill (7’ x 12’).

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