Advanced Gold Projects
Cuiú Cuiú
Coringa
Other Gold Projects
Mato Velho
União
Porquinho
Maranhense
Bauxite
Geology and Mineralization
The CPRM map which covers the Maranhense area highlights intrusive granitic rocks of the Parauari suite and sediments of the Buiuçu Formation. The Parauari suite granite hosts all of the gold deposits listed in the previous paragraph, and is known to be the most permissive host rock within the Tapajós. Monzonítes, granites and granodiorites of this suite have been mapped by Magellan in the field and host a series of mineralized shear zones and vein systems. Fault breccias and boxwork textures after sulfides are observed within the mineralized zones and andesitic dykes trending N-S and N-E have been mapped within the mineralized areas. Similar andesite dykes occur at the nearby Tocantinzinho deposit (2.1 Moz gold), where gold mineralization is often localized on the contact between the two lithologies. Interpretation of the satellite images reveals predominant NW and NE structural trends, and the latter structures appear related to mineralized structures in some cases.
Soil sampling by Magellan at Maranhense has identified a gold-in-soil anomaly (50-2000ppb) that extends E-W over 700m and extends N-S for 250m. The orientation is consistent with the direction of the structures mapped in the Pit do Filão area. Some of the better chip and channel results to date include: a chip sample across a vein hosting 7.3 g/t Au, and two spectacular high grade grab samples from quartz-sulfide vein structures that returned 90.4 g/t and 600.4 g/t Au.