AXXX BRASIL MINERAÇÃO S.A. MORRINHO MINERAÇÃO LTDA SALINAS GOLD MINE MATO GROSSO - BRAZIL PRESENTATION FOR INVESTORS
SALINAS GOLD MINE 108 km
SALINAS GOLD MINE Mato Grosso – Population: 2,803,274 (2005) – Area: 903,386 km 2 – GDP: US$ 15 billion (2006) – State with the highest economic growth in the last 18 years (GDP>315%) – Cuiabá: modern infrastructure: 550,000 inhabitants - city 900,000 inhabitants – metro – Home of important mining companies, such as: Aura Minerals Votorantim Kinross Lago Dourado Cuiabá, Mato Grosso, Brazil
SALINAS GOLD MINE
SALINAS GOLD MINE
SALINAS GOLD MINE MAG Geophysical Survey
SALINAS GOLD MINE Regional Geology Regional geological unit: Cuiabá Group: marine to epicontinental environment . Main lithologies: conglomerate, quartzite, slate and carbonatic rocks with subordinated iron-rich meta-sediments. Deformation and metamorphic dewatering responsible for formation of quartz veining systems along the main NE structural trends of the Cuiabá Group. Regional NE oriented thrust faults are the most conspicuous structures and define extensive shear zones where hydrothermal alteration and quartz veining host the main gold mineralizations. Local Geology Detritic metasediments of the Cuiabá Group. Rocks are: metasandstones, metargilites, metasiltstones, metaconglomerates, metadiamictites, carbonaceous and carbonatic meta sediments with intercalations of felsic tufaceous volcanics. Four new thrust faults with shear zones along NE direction were recognized in the area with the development of intensive hydrothermal alteration associated with quartz veining.
SALINAS GOLD MINE
A A’
SALINAS GOLD MINE Mineralization Gold related to open-filling spaces mineralization type associated with hydrothermal fluids generated by the low-grade metamorphic event along NE direction thrust faults cutting late proterozoic sedimentary rocks . Typical Salinas mineralization: 1)Veins in fractures; 2) Shear veins and 3) Disseminated gold along hydrothermal alteration zone. Vein Types Conformable: Flat to upright, N-NE striking and up to 300 m long and 0.10 to 1.0 m wide. Gold grades lower than 2.0 g Au/t. Unconformable: Usually upright, N-W striking, less than 100 m long and max. 1 m wide. Au grades: 1- 5 g/t. Mineralization: Pervasive hydrothermal alteration zones (sericitization, carbonatization, silicification and sulphidation - py ) associated with concordant and discordant quartz veins define an important mineralized system with grades around 1.0g Au/t. --- Potential to become a large low grade bulk gold deposit.
SALINAS GOLD MINE Diamond Drilling Program – 7,000 meters Main objectives : ► Confirm down dip continuity of the gold mineralization (alteration zone with quartz veins and pyrite and carbonate dissemination) detected by trenching along and among the four main known trends (West, Central, Intermediary and East shear zones). Five new targets were selected : Cumbaru, Bocaiuva, Angico/Sucupira, Imbauba and Urtiga. ► Test the continuity of the mineralization down dip below the old pits (Confusão, Rica, Max, Melechete, Represa and Jeca), previously excavated by garimpeiros ► Test reinterpreted geophysical anomalies ( IP / Mag )
SALINAS GOLD MINE Cumbaru Target - Drill rig on site
SALINAS GOLD MINE Carbonaceous rhythmic phyllites with conformable quartz vein (costelão)
SALINAS GOLD MINE Altered Sericitic phyllite with pyritic and carbonatic dissemination
SALINAS GOLD MINE Drill core logging
SALINAS GOLD MINE
SALINAS GOLD MINE
SALINAS GOLD MINE - Cumbaru Target Section AB - SD-05/SD-14 Drill Holes
SALINAS GOLD MINE Highlights Geology - Geological mapping has defined four new shear zones with evidences of gold mineralization (quartz veining and hydrothermal alteration). - Detailed work carried out along and among the known shear zones (western, central and intermediary ) generated seven selected targets (Cumbaru, Bocaiuva, Imbauva, Angico-Sucupira, Confusão, Represa and Urtiga). Excellent potential for bulk mineable resources. - Two open pits (1 and 2) excavated along NE direction at Cumbaru Target presented consistent mineralized systems: 500m and 300m respectively by 30-40 m wide have shown pervasive hydrothermal alteration and increased amount of quartz veins. - Cumbaru & Sucupira Targets: Only areas with more detailed exploration works. Diamond drilling data suggests the mineralized system continues down deep. Projection of the systems on surface defines mineralized zones with at least 100m wide.
SALINAS GOLD MINE Highlights Mine – Cumbaru Pits 1 & 2 deepened up to 25 meters. Gold headgrade higher than 2 g/t was found locally – Host rock (sericitic phyllites) presented an average grade of 0.3 g/t ; – Quartz veins presented a grade higher than 2.0 g Au /t; Conclusions: – Urgent need for mineral resources determination; – Bulk sampling recommended by SRK. Large samples needed. Large diameter drilling envisaged.
SALINAS GOLD MINE Panoramic view of the Cumbaru Target looking SW, showing the orthogonal and diagonal trenching. Estimated distance - 600 m.
SALINAS GOLD MINE Transversal section to the main NE trend showing high concentration of disrupted conformable quart veins (costelões) and transversal NW ( filões) hosted by hydrothermally altered sericitic and carbonaceous phyllites and metasandstones.
Cumbaru Target - Looking NE
SALINAS GOLD MINE Longitudinal section along NE trend showing high concentration of disrupted conformable quartz veins (costelões) and unconformable quartz veins (filões) hosted by hidrothermally altered sericitic and carbonatic phyllites.
SALINAS GOLD MINE Detailed view along the NE trend showing high concentration of disrupted uncomformable quartz veins (filões) hosted by hydrothermally altered sericitic and carbonatic phyllites.
SALINAS GOLD MINE SUCUPIRA TARGET (looking NE )
Sucupira Target - Looking SW
Sucupira Target Looking NE
SALINAS GOLD MINE Coarse Gold in pyrite boxwork - Quartz Vein - Cumbaru Target
Coarse gold in quartz vein. Sucupira Target
Coarse gold in quartz vein. Sucupira Target
SALINAS GOLD MINE Proving Mineral Resources ► 15,000 meters of trenching (100 to 200 m apart) opened in the area, so as to test three main West, Central and Eastern shear zones. Gold grade by trenching lower than plant gold grade. ► Systematic trenching defined five new target areas: Cumbaru and Urtiga (Central Trend), Bocaiuva (Intermediary Trend) , Imbauva and Sucupira / Angico ( Western Trend ). ► Testing of the primary material : four diagonal trenches at 25 m apart at central part of the Cumbaru Target. Tonnage: 3, 174 dry tons. ► Head grade obtained by back-calculation. Grade higher than two times the gold grade obtained through channel sampling – 1.022 gAu/t ► Diamond drilling (12,000 meters) used to test the down dip and along strike mineralized systems. Inconsistent and non representative analytical results. ► Bulk sampling recommended by SRK defined as the best approach for the Salinas Mineral Resources Evaluation.
SALINAS GOLD MINE Bulk Sampling Test.
SALINAS GOLD MINE Resources evaluation - 4 trenches at 25 meters apart Trench Plant tailing sampling Loading trench bulk material
Resource / Reserve Evaluation Strategy SRK proposal was to evaluate minimum 600,000 Oz as resources at Salinas; Assumptions: 2,000 m length mineralized trend along strike, 80 m vertical depth, 100m wide, grade 1.0 g/t, dipping 30°, s.g 2.08 t/m3. Trenching: 50 m and/or 25 m apart: 8,000m. Bulk sampling every 10 m: 800 samples of 80 tons; Total tonnage to be processed: 64,000 tons Channel sampling: 1,600 samples at 5 m apart; Head grade to be obtained through backcalculation using gravimetric concentrates and tailings assaying results; Diamond drilling (50X50m) = 14,000 m
Mineral Resources Evaluation Strategy Original SRK Exploration Program
SALINAS GOLD MINE Process Plants Gravity Process Plants : Gravity plant with 1,200 TPD current capacity: Basic closed circuit: Feed boxes, hammer milling, hydrocyclons, ball milling, primary & secondary centrifugal concentrators. Poor maintenance conditions. Complete refurbishment is needed. Final product is gravity concentrates. Future Fines Gold Plant: Cyanidation Gold Plant construction (2,500 TPD) seeking financing. Project and construction time : 6 months. Cost : US$ 8 million (including mine equipment). Future Fines Gold Plant metallurgical route: Gravity circuit plus Flotation & Agitated leaching (CIP-Carbon in Pulp). Cyanidation Plant will also process old Gravity Plant Tailings . Gold electrolytical recovery . Expected overall recovery: 90-92%
SALINAS GOLD MINE Cyanidation Plant - Environmental Permit Environmental Control Plan & Report - Environmental License ECP and Environmental Application submitted to SEMA (State of Mato Grosso Environmental Authority) on July 21, 2008; Full Cyanidation Environmental license obtained from SEMA on December 2008. Environmental License has been successfully renewed every three years.
SALINAS GOLD MINE GRAVITY PLANT – Ball Mills, Cyclones and Spirals
Recommend
More recommend
