Rio do Ouro (new name for Sertão) Drilling Update High Grade...

Rio do Ouro (new name for Sertão)
Drilling Update High Grade Extension to Stage 4 Orebody
• Assays results of 0.5m @ 38.1g/t Au for Sertão (now renamed Rio do Ouro which translates
in English as ‘River of Gold’
Drill hole OST012 indicate significant high grade westerly extension of mineralisation in the
Sertão Stage 4 orebody
. • Diamond Drill Hole OST001 and OST003 assays pending.
• Fault confirmed along the western edge of Sertão Stages 1 to 6.

• At the other end of the pit drilling has also started, testing the eastern extension of
the old Sertão Stage 5 with OST013 and OST014 some 120 metres from the
old pit wall.
• Visual interpretation of OST013 suggests approximately 1.0-3.0 metres of oxidised
mineralisation from a depth of 15 metres.

• Full drilling results from Antena Phase 1 programme are expected to be released next week.

Assay results for OST012 indicate significant high grade extension to the Sertão Stage 4 orebody (now called Rio do Ouro) to the west of previously mined Stage 4 open-cut pit.

OST012 assays were requested to be processed as a high priority to allow the assays to be
analysed with OST001 to confirm the priorities for ongoing drilling program to the west
of Sertão Stages 4 and 5.
To date the OST001 assays have not been received.

Figure 1: Aerial view of current western extension drilling campaign.
2 Examination of current and historic drill core indicate the presence of a fault running south-southwest to north-north-east along the western edge of the old Sertão mine.

It is assessed that the fault in this area has resulted in the dislocation of the high grade ore
shoots by approximately 25m and have previously caused the difficulty in proving continuation
of the high grade mineralization to the west of the Sertão Mine.

Current drilling is underway to test the eastern extension to the old Sertão Stage 5 ore body with two shallow programmed Diamond Drill Holes (OST013 and OST014).
Historic drilling had tested for extension of the Sertão Stage 5 orebody directly to the east of the previously mined section of the old Sertão Stage 5 pit, however; no allowance was made for
potential offsetting of the orebody due to additional faults in this area.
Initial examination of the drill core from OST013 is encouraging and are currently being prepared for dispatch for assay.

Figure 2: Untested potential eastern extension of the old Sertão stage 5 orebody. Orinoco’s Head of Exploration, Mr. Thiago Vaz Andrade, said: “Drilling at Sertão which is locally known and renamed
to Rio do Ouro (River of Gold) is very encouraging with mineralization encountered in the first
four holes of our programme.
We are also encouraged by OST013 at the other end of the pit which is easily accessible in the event
of an open pit restart.