Cabral Gold Announces That Metallurgical Test Results from MG Gold-in-Oxide Material at Cuiú Cuiú Indicate 92 - 93% Gold Leach Recoveries
Cabral Gold Announces That Metallurgical
Test Results from MG Gold-in-Oxide Material
at Cuiú Cuiú Indicate 92 - 93% Gold Leach
Recoveries
Vancouver, British Columbia--(Newsfile Corp. - July 31, 2024) -
Cabral Gold Inc. (TSXV: CBR) (OTC
Pink: CBGZF) ("Cabral" or the "Company")
is pleased to provide results from three additional
column-leach metallurgical tests on three samples of gold-bearing oxide material from the MG gold
deposit within the Cuiú Cuiú gold district in northern Brazil.
Highlights are as follows:
Gold recoveries from three samples from the MG gold deposit (i) blanket soil, colluvium and
sediments, (ii) low-grade saprolite material and (iii) higher grade saprolite material from the MG
gold deposit ranged from 92 - 93% after 68 to 112 days of column leaching
The results for all three samples were very consistent and confirm that heap-leach processing is
highly viable at the MG gold deposit and that heap leaching of the oxide material is likely the
preferred option for processing
These results are a notable improvement on previous column leach tests conducted on a
composite sample of blanket and saprolite material from MG, which returned 82% gold recoveries
after 60 days
Alan Carter, Cabral's President and CEO commented, "These column leach test results are very
encouraging and confirm that that the gold-in-oxide material at the MG gold deposit at Cuiú Cuiú is
amenable to heap-leach processing. The leach recoveries of 92% to 93% are excellent and
significantly better than previous test work which revealed an 82% recovery. They are also significantly
higher than most heap leach gold mines that are currently in operation. These results should allow us
to positively adjust our projected gold recoveries which form part of the ongoing prefeasibility study.
These gold recoveries are particularly significant given the recent excellent drill results we are seeing
from the Machichie Main and Machichie NE targets which are located only 500m and 650m north of
the MG gold deposit, and indicate significant potential for additions of gold-in-oxide material in close
proximity to MG."
Column Leach tests
As part of the ongoing prefeasibility study on the gold-in-oxide material at Cuiú Cuiú, Cabral collected
mineralized material from the MG gold deposit and shipped three composite samples to Kappes,
Cassiday & Associates ("KCA") lab in Reno, Nevada to conduct heap-leach metallurgical testing. The
samples were collected from diamond drill core drilled at a number of locations over the extent of the
near-surface MG oxide resource.
Three composite samples were created representing the two principal material types in the resource:
one composite in the colluvial blanket zone (consisting of soils and sediments) and two composites
representing the saprolite zone (consisting of weathered mineralized intrusive material). The MG blanket
composite was designed to represent material near the average grade of the zone, whereas the
saprolite composites were designed to represent high-grade and low-grade examples of mineralized
material within that zone.
KCA completed a comprehensive series of metallurgical tests on the samples including extensive
assaying, compaction and permeability tests, bottle roll tests, agglomeration tests, and column leach
tests.
Samples were crushed to minus 50mm size then agglomerated with addition of 20 kg/MT of cement.
Leach tests were conducted in columns eight feet (244cm) tall by eight inches (20cm) in diameter.
Samples were subjected to leaching with a dilute cyanide solution over periods lasting from 68 to 112
days (Table 1, Figures 1 and 2). Gold recoveries in all three samples ranged from 92% to 93% with
+70% of gold recovered in under 20 days. Sodium cyanide consumption was low ranging from 0.31 kg/t
to 0.48 kg/t NaCN.
KCA
Test No
Description
Grade calc. head
g/t Au
Extracted
g/t Au
Av. Tails
g/t Au
Extracted % Au
Days of Leach
Consumption
NaCN kg/t
93719
MG Blanket
0.440
0.411
0.029
93%
68
0.48
93722
MG saprolite
High grade
1.568
1.449
0.119
92%
112
0.37
93725
MG saprolite
Low grade
0.580
0.539
0.041
93%
68
0.31
Table 1. Summary of column leach test results for MG samples. g/t = grammes per tonne gold, kg/t +
kilogrammes per tonne
Figure 1. Cumulative gold extraction vs time for three MG gold composites
To view an enhanced version of this graphic, please visit:
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Figure 2. Cumulative gold extraction vs Solution to Ore for three MG gold composites
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Results of all three samples demonstrate excellent recoveries in the order of 90 to 120 days. These
column tests further confirm that heap-leach processing of the oxide blanket and saprolite material is
viable at Cuiú Cuiú and is likely the best option for processing. The adoption of heap-leach processing
could result in significantly lower initial capital investment and processing costs than other processing
routes. In general, the adoption of heap-leach processing has the potential to significantly improve the
economics for a potential future mining operation developed at Cuiú Cuiú.
The gold recoveries reported here (92-93%) are significantly better than the previous column leach test
conducted on composite oxide material from the MG gold deposit which resulted in a gold recovery of
82% after 70 days (see press release dated 21
st
June 2022). This may be because the previous single
MG composite consisted of material from both the colluvial blanket and the underlying saprolite material.
Cyanide consumption rates were also lower (0.31 - 0.48 kg/t) than the previous test (0.51 kg/t), as was
the amount of cement used previously (23.96 kg/t) versus the amount used in the most recent tests (20
kg/t).
Results are currently pending on three column leach tests that are being conducted on material from the
Central gold deposit and are expected during Q3 2024.
About Cabral Gold Inc.
The Company is a junior resource company engaged in the identification, exploration and development
of mineral properties, with a primary focus on gold properties located in Brazil. The Company has a
100% interest in the Cuiú Cuiú gold district located in the Tapajós Region, within the state of Pará in
northern Brazil. Two main gold deposits have so far been defined at the Cuiú Cuiú project which contains
National Instrument 43-101 compliant Indicated resources of 21.6Mt @ 0.87 g/t gold (604,000 oz) and
Inferred resources of 19.8Mt @ 0.84 g/t gold (534,500 oz) as per the 43-101 technical report dated
October 12, 2022.
The Tapajós Gold Province is the site of the largest gold rush in Brazil's history which according to the
ANM (Agência Nacional de Mineração or National Mining Agency of Brazil) produced an estimated 30
to 50 million ounces of placer gold between 1978 and 1995. Cuiú Cuiú was the largest area of placer
workings in the Tapajós and produced an estimated 2Moz of placer gold historically.
FOR FURTHER INFORMATION PLEASE CONTACT:
"Alan Carter"
President and Chief Executive Officer
Cabral Gold Inc.
Tel: 604.676.5660
Technical information included in this release was supervised and approved by Brian Arkell, B.S.
Geology and M.S. Economic Geology, SME (Registered Member), AusIMM (Fellow) and SEG
(Fellow), Cabral Gold's Vice President, Exploration and Technical Services, and a Qualified Person
under NI 43-101.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as such term is defined in
the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
Forward-looking Statements
This news release contains certain forward-looking information and forward-looking statements within
the meaning of applicable securities legislation (collectively "forward-looking statements").
The use of
the words "will", "expected" and similar expressions are intended to identify forward-looking
statements.
These statements involve known and unknown risks, uncertainties and other factors that
may cause actual results or events to differ materially from those anticipated in such forward-looking
statements.
Such forward-looking statements should not be unduly relied upon. The Company
believes the expectations reflected in those forward-looking statements are reasonable, but no
assurance can be given that these expectations will prove to be correct.
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