Cerro de Pasco

  • Cerro de Pasco was one of the oldest and largest polymetallic mines in the world, operating for almost 400 years.
  • The Quiulacocha tailings facility contains approximately 79MT of processable mineral, from the Cerro de Pasco mining complex.
  • The Excelsior Stockpile, likewise from the mine, contains 104MT with an estimated 43Mt of mineral that could be processed at nearby concentrators Paragsha and San Expedito.
Cerro de Pasco Excelcisior Stockpile: ″The Largest Aboveground Mineralized Resources in the World″

The property is known as the Excelsior and consists of the Excelsior Mineral Pile (“EMP”) and Quiulacocha Tailings (“QT”) forming residues generated by the processing of the Cerro de Pasco Mine Pb-Zn-Ag-Cu ore located 310 km from Lima, in east-central Peru.

The EMP occupies an area of 94 ha and contains 26,400,000 m3 of fragmentary rocks forming terraces composed of sulfide-rich rocks, sericitized volcanic and carbonate (dolomitic) rocks. Metal-bearing minerals consist of sphalerite (Zn), tennantite (Cu), cerussite (Pb), enargite (Cu) and galena (Pb, Ag-rich). The more reliable Historical Resources Estimate generated 42.89 Mt @ 0.09 wt. % Cu (85.1 M lb), 0.73 wt. % Pb (690.3 M lb), 1.59 wt. % Zn (1696.1 M lb) and 66.1 g/t Ag (91.1 M oz) with Pb+Zn= 2.33 wt. %*.

The Excelsior Mineral Pile

The QT cover a surface of 114 ha and contain approximately 79 Mt of pyrite-bearing tailings of two different types: Cu-rich and Zn-Pb-rich sulphides. The best Historical Resources Estimate generated a total of 2.94 Mt @ 43.1 g/t Ag (4.1 M oz), 418 ppm Cu, 0.79 wt. % Pb (51.2 M lb) and 1.43 wt. % Zn (92.7 M lb)*.

* The estimates presented above are treated as historic information and have not been verified or relied upon for economic evaluation by the Issuer or the writer. These are considered historical Mineral Resources and do not refer to any category of sections 1.2 and 1.3 of the NI-43-101 Instrument such as Mineral Resources or Mineral Reserves as stated in the 2010 CIM Definition Standards on Mineral Resources and Mineral Reserves. The explanation lies in the inability by the authors to verify the data acquired by the various historical drilling campaigns and other sampling works. The authors have read the documents pertaining to the description of the different methods used in the historical evaluation of the Mineral Resources. The Issuer has not done sufficient work yet to classify the historical  estimates as current Mineral Resources or Mineral Reserves. Therefore, the Issuer is in the opinion that the above quoted resources for the EMP cannot be relied upon.

The Quiulacocha Tailings