Surface Geochemistry
Mantaro has channel sampled approximately 30% of known vein outcrops — all veins are pervasively oxidized at surface and leached of all sulphides.
- Despite pervasive leaching — surface channel sampling has defined robust silver and gold grades along parts of the San Jorge, Tembladera, Tembladera 1, Kelly, Pacquita and Maribel veins.
- Silver grades are generally high above the historical San Jorge underground workings over a strike length of approximately 450 m (Figure 30). The Tembladera 1 and 2 veins are significantly silver anomalous over a cumulative strike length of at least 500 m. Channel samples define moderate to high silver grades over approximately 750 m of the Paquita vein and almost one kilometres strike of the Maribel vein. Lead and zinc grades are generally of low tenor — as would be expected in pervasively leached outcrops such as these.
- Surface channel samples defined a coherent and strong gold anomaly (up to 56 g/t Au) over a strike length of approximately 200 m at a flexure in the Kelly vein.
- Channel samples also returned significant gold assays in parts of the Paquita and Maribel veins — along parts of the vein that are also highly anomalous in silver.