The Ayawilca Tin Zone forms flat-lying sulphide lenses at the contact of the limestone and phyllite, underlying the Zinc Zone at Central and East Ayawilca. The Tin Zone sulphide lenses consist of massive pyrrhotite with quartz, chlorite, cassiterite (an common ore mineral of tin), pyrite, and chalcopyrite. Quartz stockworks within phyllite also host tin-copper mineralization beneath the lenses.
Further metallurgical test work is required to determine the recoverability of the cassiterite mineral from the sulphide-rich mineralization.
Mineral resources at the Ayawilca Tin Zone are estimated to contain, as at November 26, 2018 (see Table 1):
- 201 million pounds of tin in the Inferred resource category;
- 67 million pounds of copper in the Inferred category;
- 8 million ounces of silver in the Inferred category.