Andréia Cristina Ruy 1, 2, andreiac.ruy@gmail.com, Adalene Moreira Silva1, adalene@unb.br, Walid El Koury Daoud2, walid@verenamin.com.br, Jad Salomão 2, jadsalomao@verenamin.com.br, 1Instituto de Geociências-UnB, 2Verena Mineração Ltda.

The geology of the Volta Grande propierty, located in Para State, Brazil, is related to metavolcanic

and metassedimetary rocks of the Três Palmeiras Greenstone Belt with two elongate diorite

intrusions, known a North Block and South Block approximately 5 km away. The mineralization is

hosted by both intrusions wich are trending NW and size 8 Km long by 1 Km wide. In the North

Block, wher e most of the work was carried out, the gold mineralization is found in the steeply dipping

shear zone system close to the contact zone of the intrusion with basic rocks of the greenstone belt.

Gold resources are 68Mi t @0,93 g/t with cut-off 0,5 g/t (2,029Mi Oz of gold), based on 33792 m of

drilling holes, reported by Wilson RPA, from Toronto, Canada and complaint with the NI-43101

standards (Feb 2008). Verena Mineração Ltda holds 100% of the concessions. Figure 01- Regional geological setting extracted from Altamira 1:250 000 scale (SA-22-Y-D) (CPRM, 2001) The red polygon represents the area covered by airborne geophysical survey.

The interpretation of the geophysical data pointed out new targetareas which were confirmed by geological and geochemistryapproaches (Figures 4.1 and 4.2).

Based on geophysical interpretation, where high K, Th and Uconcentration occurs, a soil geochemistry was carried out confirmingCu,Fe,ETR anomalies and generating a new IOCG target namedItuna (Figure 5).

RGB (KThU)DZ -First Vertical DerivativeASA -Analytical Signal Amplitude

Several geophysical maps that delineate highly prospective areaswere derived. In regional prospective terms, the geophysicalproducts convincingly map important host rocks units. Moreimportantely, they predict new prospective targets in each of thedifferent mineralized environmets, inside and outside the knownmineralized areas with potencial to contain similar mineralization.

Volta Grande (1:100 000) Geological map based on geophysical interpretation

Radiometric DomainsStructural/Magnetic Domains

Figure 2 – Geophysical fluxogram: 2a.to 2c: geophysical products, 2d:Interpretation for integrated forgeophysical and geological data.

The Volta Grande airborne magnetic gradiometry and gamma spectrometric data(2007) were acquired using 200 m spaced north-south flight lines with orthogonaltie lines flown every 2,000 m at 100 m of constant ground clearance.

The interpretation of magnetic and gamma-spectrometric data allowed thediscrimination of several litho-structural domains (Figure 2d), the signature of mainhost rocks and hydrothermal alteration zones.An important interpretation of the Volta Grande area was achieved from visualanalysis of the ternary radioelement map (Figure 2c) and the analytical signalamplitude map (Figure 2a). This map highlighted the key host rocks in the area:granodiorite and diorite (Figure 3.1 and 3.2).

The high resolution airborne geophysical data mapped the favorable settings for theknown mineralization (Grota Seca and Pequi target areas) that represent acombined structural and lithologic factors. Favorable structural settings are linkedmainly to the rheological heterogeneities in the host sequences. The magnetic dataallowed to map shear zones and faults developed along lithologic contacts betweenunits of contrasting competencies.

2a 2b 2c

2d

Figure 3- 1) South block showing thegranodiorite mineralized area; 2) North Blockshowing the diorite host rock and the GrotaSeca mineralization, 3) High K, Th and Uanomaly mapped in the 2007 fieldwork as aIOCG target.

Figurea 4.1 and 4.2 -Geophysical and soilgeochemistry integration,showing the coincidentanomalies. The best grades ofAu zones are associated tothecontact of diorite andmetavolcanic rocks, along theNE/SW direction.

Figure 5 - 1) HighK,Th and U and 2)Regional magneticanomaly showing anew target namedItuna.

Au(ppb)

Au(ppb)