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Location: 50 km S from Huamachuco, Peru
Pataz, La LibertadVijusPeru
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The Santa Maria and Marañón mines are located within the Marañón Valley gold (Au) belt.The 160 km-long Marañón Valley Au belt, located in the Eastern Andean Cordillera of Peru, represents one of these continental arc-derived igneous belt that formed along the Peruvian margin of Gondwana in the Early to Middle Mississippian.Magmatic-hydrothermal origin of gold mineralization in the Marañón Valley Au belt has been proposed by several authors (Macfarlane et al., 1999; Schreiber et al., 1990b; Sillitoe, 2010; Vidal et al., 1995). In a recent study, Witt et al. (2016) proposed an intrusion related model in the northern Pataz-Parcoy district, and envisaged the mineralized fluid to be derived from the magma chamber that was also a source for Carboniferous subvolcanic and volcanic rocks. Although the timing constrain of the intrusive rocks is well known, there is a significant lack of constraints on the timing emplacement of the subvolcanic and volcanic rocks along the Marañón Valley Au belt. Mineralization in the Marañón Valley Au beltBatholith-hosted gold mineralization in the Pataz-Parcoy district exhibits spectacular sulfide rich veins up to several meters wide and hundreds of meters long. The paragenetic sequence remains, however, controversial and mineral textures and chemistry of the sulfides-rich alteration mineral assemblage have not been assessed in detail.Arsenic-rich sulfides, such as arsenian pyrite and arsenopyrite, carry gold in their lattice crystal structure (so-called invisible gold; Barker et al., 2009; Deditius et al., 2014; Fleet and Mumin, 1997; Fougerouse et al., 2016; Mumin et al., 1994; Palenik et al., 2004; Reich et al., 2005) and are common in the ore mineral assemblage in the batholith-hosted veins from the Marañón Valley Au belt.
