G'Day all- Continued prospective Data Cascavel & Tinteiro. On 8...

G'Day all- Continued prospective Data Cascavel & Tinteiro. 

On 8 January 2018  in our announcement to ASX entitled 17.56m @ 1,292 g/t silver supports targeting more high-grade zones along the Cascavel Dolomite layer, the Company highlighted the potential for high grade silver deposits to the south of Cascavel.
These silver intersections appear to be on the edge of a much larger polymetallic system that we know as Tinteiro.
Mapping in the Cascavel mine has shown that the high-grade silver and base metal mineralisation is related to the intersection of a series of north-east trending faults and a dolomitic unit in the footwall of the main Cascavel gold structure.
In May 2013, Orinoco announced the discovery of high-grade silver and base metal mineralisation in the footwall of the Mestre zone and over the hanging wall of the Cuca zone gold lode at Cascavel grading 17.6m @ 1,263 g/t Ag & 11m @ 0.25% Cu from 101m (refer to endnotes 1-10 on page 7 for previous ASX announcement details).
This included 2 metres of silver at 6,680 g/t with 0.92% copper .

At the time our team felt the silver results represented the margins of a much larger system from Tinteiro; the current thinking has not changed.

See position of mentioned silver intercept in Figure 2 below relative to the position of the Cascavel mine.


Tinteiro -Cobalt -Sort of grabs ya attention !

The current ongoing sampling program is achieving results that further reinforce existing geological models that suggest that Tinteiro hosts widespread multi element targets which exist along structural features like fold hinges and crosscutting faults.

Photo 1: Sample 20768 grading 1.75% cobalt, 0.6% copper and 0.5% nickel
Tinteiro a world class Exploration Target-Whilst Orinoco’s primary focus is gold production at Cascavel and exploration for gold at Cascavel, Antena, Sertão and Eliseo, the ongoing evidence of high grade cobalt, copper, nickel, gold and silver rock chip samples at Tinteiro suggests the need for a separate drill program .
The surprising outcomes from this sample set is that the best cobalt grades are 1.2km due south of our Cascavel gold and silver mine.
Orinoco Gold Limited (OGX or Company) is pleased to announce that a total of 54 rock chip samples at Tinteiro have shown high grade cobalt mineralisation up to 1.75% cobalt, 0.5% nickel and 0.6% copper from Independent laboratory, ALS.

The three best assays of 1.54%, 1.65% and 1.75% cobalt were found 1.2km due south of our Cascavel high grade producing gold mine in Area 3 known as Central Tinteiro.
Previous drilling was conducted at Areas 1 Tinteiro North and 5 South East Tinteiro but no drilling was done at Area 3 next to Cascavel (refer to endnote 10 for previous ASX announcement details).
An independent study reported in the Brazilian Journal of Geology on December 2017 entitled Prospectivity Analysis of Gold and Iron Oxide Copper-Gold-(Silver) Mineralisations from the Faina Greenstone Belt, Brazil, using multiple data sets noted that Central Tinteiro Area 3 and South-east Tinteiro Area 5 appeared to highlight cobalt prospectivity with concentrations above 10,000 ppm in these areas.

The new high-grade samples suggest the Company should turn its attention closer to Cascavel in the Central Tinteiro Area 3.

"Another 50 rock samples will be taken next to Cascavel next week and sent to ALS."
Cobalt, copper, nickel, gold and silver mineralisation is found across the whole 7km strike of Tinteiro, but the best results so far appear to be next to Cascavel gold mine. OGX has engaged an Independent polymetallic specialist Mr Olavo Caramori Borges to join Mr Thiago Vaz Andrade and the Exploration team on site next week to assess next steps at Tinteiro and Cascavel as a potential cobalt and silver target for drilling in Q3’2018.

What happened to the results of the 50 x samples taken next to cascavel & what was the outcome after OGX has engaged Independent polymetallic specialist Mr Olavo Caramori Borges to join Mr Thiago Vaz Andrade and the Exploration team?Think there also missing in action !



For those that have not read the below analysis-it makes very compelling reading indeed-below is the link along with a couple of extracts-note very bottom page highlited -Re Sertao -, and they plan to reopen it as an underground mine". !

[PDF]

Prospectivity analysis of gold and iron oxide copper-gold - SciELO

Prospectivity analysis of gold andiron oxide copper-gold-(silver)mineralizations from the Faina GreenstoneBelt, Brazil,
using multiple data sets.

This is an extremely comprehensive study -Bottom of first paragraph -Quote This study focuses on detailing two selected targetmineralization sites "' Cascavel'' and ''Tinteiro'' of the FainaGreenstone Belt using a methodology based on the processingand interpretation of aeromagnetic, gamma spectrometryand geochemical data.

Extract from first paragraph is very reveling-Quote  The discovery of Sertão, a low-tonnage and high-gradegold mine, had a positive impact on the local economy andon the cities of Faina and Goiás.
The mine was explored inthe period from 2000 to 2007 by Sertão Mineração Ltda.,which ceased its activities after exploiting the oxidized ore toa depth of 40 m.
The company reported the extraction morethan 250,000 ounces of gold, at an average recovered gradeof 24.95 g/t Au. Since 2011, the area has been studied byYamana Gold Inc. and Orinoco do Brasil Mineração Ltda.Orinoco do Brasil Mineração Ltda. is particularly relevantbecause of its investments in the Faina GreenstoneBelt, including an innovative exploration program forknown target sites, such as Cascavel, and the discovery ofthe new target sites of Tinteiro and Eliseu.
The new targetsites indicate a potential for gold and polymetallic mineralizationsin the region.
Additionally, the company resumedand intensified their studies in the Mina de Sertão site, 'The discovery of Sertão, a low-tonnage and high-gradegold mine, had a positive impact on the local economy andon the cities of Faina and Goiás. The mine was explored inthe period from 2000 to 2007 by Sertão Mineração Ltda.,which ceased its activities after exploiting the oxidized ore toa depth of 40 m. The company reported the extraction morethan 250,000 ounces of gold, at an average recovered gradeof 24.95 g/t Au. Since 2011, the area has been studied byYamana Gold Inc. and Orinoco do Brasil Mineração Ltda.Orinoco do Brasil Mineração Ltda. is particularly relevantbecause of its investments in the Faina GreenstoneBelt, including an innovative exploration program forknown target sites, such as Cascavel, and the discovery ofthe new target sites of Tinteiro and Eliseu. The new targetsites indicate a potential for gold and polymetallic mineralizationsin the region. Additionally, the company resumedand intensified their studies in the Mina de Sertão site, andthey plan to reopen it as an underground mine.

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