Download the technical report here: PB-Technical-Report-2021.pdf
Pedra Branca is an untapped gem located amidst excellent infrastructure in northeastern Brazil. The maiden Inferred Mineral (4,042,000 t grading 1.38 g/t Au for 180,000 ounces of gold, was calculated utilizing only 42% of the total assay results. South Atlantic’s reverse circulation drilling only averaged 40 m in depth. Phase II Exploration will conduct a deeper drilling and explore more to the southern portions of Pedra Branca.
The Pedra Branca Project is hosted within the Ceará Central Domain, in the northern portion of the Borborema Province and comprises both the Tróia-Pedra Branca (Cruzeta Comples) and the Ceará Central Complex. Mineralization at Pedra Branca is identified as a mesothermal shear zone-hosted gold deposit.
Geotectonically, these complexes can be explained by the reconstruction of the Pangea Supercontinent, where there is a correlation between the African Shield (Nigeria Shield) and the Central Ceará Domain. The main tectonic event was associated with the Brazilian Pan-African orogen of Western Gondwana, aged at the end of the Neo‐Proterozoic, correlated to the convergence as described by Fragoso-Cesar (2008):
the Amazonian with the West Africa cratons;
the Borborema with Nigeria/Cameroon Belts;
São Luís with West Africa; and
São Francisco – Congo
Identified gold mineralization at the Pedra Branca Property is recognized by most of the geological community as mesothermal shear zone hosted gold deposit, associated to the Senador‐Pompeu shear zone. Mineralization generally occurs associated with quartz veinlets parallel to the foliation (Coelho and Queimadas targets) and sub‐metric to meter milky quartz veins at the Mirador and Igrejinha targets. Mineralization is often continuous to considerable depths in these systems.
Igrejinha is one of our main targets alongside Coelhos and Queimadas. The RC drilling at Igrejinha was designed to better understand the geology, structure and controls on the known mineralized zones and their extension along the trend zones in order to support further exploration programs, following the Orogenic Gold Mineralization Model that is often continuous in significant depths in these systems.
The gold mineralization at Igrejinha is characterized by subparallel intra-foliated millimetric/centimetric strings of sulfides in amphibolite shale with magnetite and fine quartz-feldspar rock, subordinately by hydrothermal silicification zones and pyrite >> pyrrhotite sulphides.
The Igrejinha target continues to be the main focus of the Phase 1 RC drilling program, with PB-RC-002 returning 1 m grading 5.9 g/t from 22 m depth, and PB-RC-003A intercepting 3 m at 1.13 g/t Au from 5m depth. Trenches at Igrejinha, PB-TR-009 and PB-TR-006 returned 6 m grading 7.19 g/t Au, and 29 m grading 0.73g/t Au (Including 3m at 3.22g/t Au), respectively.
Gold mineralization is Identified as mesothermal shear zone hosted gold deposit, associated to the Senador‐Pompeu shear zone. Mineralization generally occurs associated with quartz veinlets parallel to the foliation at the Coelho- Queimadas Target. Typical shear zone structural elements are not evident in the field and hydrothermal alteration occurs locally and in a few meters halo in the tremolite‐actinolite schists, chlorite schists and biotite‐gneiss that constitute the wall rocks. Strong silicification is present in all targets while eventual biotite, epidote, diopside and carbonate alteration occurs at the Coelho‐Queimadas targets.
The gold mineralization at the Coelhos-Queimadas Project is characterized by the subparallel intra-foliated millimetric/centimetric strings of sulfides in amphibole shale with magnetite and fine quartz-feldspar rock, subordinately by hydrothermal silicification zones and pyrite >> pyrrhotite sulphides.
Table of Recent Exploration Results Au 50 ppb at Pedra Branca