The Coringa Gold Project consists of eight exploration concessions or tenements totaling 23,620.03 hectares (ha). All concessions are owned by Chapleau Exploracao Mineral Ltda., the 100% owned Brazilian subsidiary of Serabi.
Summary:
The Coringa Gold Project is underlain by granitic intrusions of the Maloquinha group and rhyolites of the Iriri group (Salustiano Formation). The granites are granular, medium-grained, and consist of pink feldspar and quartz. The rhyolites are fine to medium-grained, porphyritic, and strongly magnetic. Sanidine and quartz phenocrysts occur in a fine-grained matrix of sanidine-quartz. Minor amounts of biotite also occur in the matrix which has been altered to chlorite.
There are two dominant structural trends on the Coringa Gold Project property:
• The 310° structures are interpreted as strike-slip faults with probably a dextral (right lateral) sense of displacement.
• Structures trending at 345° are interpreted as R-shears.
Mineralized veins at the Coringa Gold Project are associated with the R-shears. The dip of the veins ranges from 750 to the east to vertical, but they occasionally dip steeply westward (e.g., Galena Vein).
Mineralization at the CoringaGold Projectis associated with a shear/vein system that has a strike length of over 7 km. The mineralized zones vary in thickness from <1 centimeter (cm) up to 14 meters. Several veins (i.e., Galena, Mãe de Leite, Meio, and Come Quieto) occur along the main mineralized corridor and others, such as Serra, Demetrio, and Valdette, form subparallel zones. The average thicknesses for the veins included in the estimate of mineral resources are: Serra 0.52 m, Galena & Mãe de Leite 0.59 m, Meio & Come Quieto 0.41 m, and Valdette 0.80m.
Gold mineralization is almost exclusively associated with quartz-sulphide veining. Pyrite is the main sulphide, but minor concentrations of chalcopyrite, galena, and sphalerite are common. A genetic study of mineralization indicated that pyrite-chalcopyrite (+/- quartz) mineralization occurred first, followed by gold, with galena and sphalerite introduced late. Gold is typically free (or within electrum) and occupies fractures within sulphide grains. It is usually very fine grained and visible gold is rare. Gold in electrum is closely associated with quartz and pyrite. The bulk of the gold has a preference for deposition in the quartz matrix/groundmass (48% locking affinity) and within pyrite (31%) occurring in either fractures or as inclusions, as well as in other sulphides, oxides, and, to a lesser extent and depending on tectonic conditions, in silicates.
The mineralized veins exposed on the Coringa Gold Project are similar to those found in Orogenic gold deposits. This deposit type has been described by (McCuaig, et al., 1998; Groves, et al., 1998; Goldfarb, et al., 2001). Orogenic gold deposits are the source of many of the great placer gold districts (e.g., Tapajós; Klondike; Mother Lode, California; East Russia).