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. The Yauli Dome is the foremost structural feature of the San Cristobal region. This dome measures thirty kilometers by twenty kilometers. The long dimension strikes about N 40° W. The center of the Yauli Dome is formed by the Chumpe Anticline, the main structural feature of the San Cristobal area. Mineralization in the San Cristobal mineral district is of two different types, namely veins and mantos. Veins are emplaced transverse to the axis of the Chumpe Anticline, whereas mantos are located on the limestone side of the Paria limestone Mitu volcanic rocks contact. The axial zone of the Chumpe Anticline is intruded by a quartz monzonite intrusion and two major alaskite dikes parallel to the axis of the anticline. San Antonio Mantos The San Antonio mantos are located in the southeast end of the two-kilometer Carahuacra-San Antonio area. The general strike of the San Antonio mantos is N 30° W and their dip is between 60° and 85° southwest. The mantos contain sphalerite and galena as ore minerals. Outcrop of the mantos weather to a black color resulting from the presence of manganese oxides. Toldorrumi Manto About one kilometer southeast of the San Cristobal mine lies the Toldorrumi manto. A seven hundred-meter long low-grade manto exists on ........

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

There was an increase of 1% in the head grade of Zn and 4% in the head grade of Pb, however a reduction of 14% in the head grade of Cu and 6% in the head grade of Ag, due to the delays in the primary developments of 2021 due to the impact of the third and fourth waves of the covid-19 in addition to delays in the replacement of equipment, which caused the pits scheduled for 2022 to have a lag in their exploitation, mainly in RP 722 and vein K, very important contributors in volume and grade.

Sub-level stoping is utilized as a primary mining method.

The exploration program focused on increasing geological certainty of the mineral resources planned to be mined in the next four years and incorporating new economic mineral resources with immediate operational scope. The lateral extensions and deepening of the main veins were evaluated, as well as the areas with high geological-economic potential, such as the Ramal Piso 722, 658, Split 658 and K vein veins; registering high metallic contents of Zn, Pb and Ag.

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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