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Location: 4 km S from San Mateo, Peru
Cal. Coronel Inclan No. 211, Ofic. 509LimaPeru
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The CMC is a polymetallic hydrothermal, brittle low sulphidation deposit hosted in the andesitic rocks of the Rímac Formation. The veins exhibit pinch-swell type behavior typical of hydrothermal systems found within compressional and extensional structural environments. Vein widths reach upwards of 2.0 m and with a mean width of 0.6 m. The veins are known to split into two or more branches separated by waste rock materials. The CMC property is almost entirely underlain by the Rímac Formation andesitic volcanic rocks. The base of the sequence is composed of brecciated volcanic rocks overlain by andesitic flows, agglomerate and tuff towards the top of the Cerro Huamanjune at approximately 4,500 masl elevation.Mineralization at CMC is that of an anastomosed system where most of the secondary and tertiary veins branch off either from the main vein or the secondary veins. This has produced the necessary conduits to be filled by mineralized hydrothermal fluids. The overall system trends towards the NE at approximately 15°, and the veins are primarily sub-vertical to steeply NW dipping. It is thought that the anastomosed vein system is part of a larger tectonic shear zone with associated secondary and tertiary tensional veins. The three main veins on the CMC property include the Wellington, Constancia and Animas veins. These veins define three structurally dislocated blocks from which a series of secondary and tertiary tensional veins splits off. The veins are extensive and are known to extend over 4 km along strike and more than 1.5 km down dip.Typically, the veins show Qtz-clay-pyrite argillic alteration, which extends up to 2.0 m into the footwall and hanging wall of the veins. The alteration does not contain any economic mineralization of note. Main VeinsConstancia Vein The vein outcrops at an elevation of 4,540 masl. Nyrstar completed drilling that confirmed a down dip extension of over 300 m below the lowest mine workings. This increased the known vertical extent of the Constancia Vein to 1,700 m. The vein has a strike extent of almost 4 km, of which 2.3 km are within the CMC property. The vein strikes towards 200° SW and dips from 75° to 80° NW. The vein widths range from 0.10 m to 1.20 m wide with a mean width of 0.54 m. Mineralization typically consists of Qtz-AsPy-Py, followed by another band of sphalerite-galena-chalcopyrite.Wellington VeinSimilar to the Constancia Vein, the Wellington Vein is steeply dipping to the NW. The widths are also similar, with a mean of 0.64 m. The vein commonly splits into two separate branches, which have been mapped up to 1.4 m wide with some local ore shoots of up to 3.0 m in width. The vein is typically associated with clay-silica-pyrite sericite alteration in both the hanging and footwall, as well as fault gouge. Animas VeinThe Animas Vein extends for over 1 km and has a mapped vertical extent of approximately 300 m. The vein has a mean width of 0.65 m. It was the target of exploration during the 2015 and 2016 drilling program and returned results of 3.64 grams per tonne (g/t) Au and 417 g/t Ag over 0.41 m and 1.50 g/t Au and 107 g/t Ag over 1.20 m, with minor base metals. There has been no known production from the Animas Vein.
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