CB Gold Inc. Announces Average Combined Gravity Flotation Gold and Silver Recoveries of 88.6% and 81.4%, Respectively From Ad...
22 Mayo 2014 - 8:24AM
Marketwired Canada
CB Gold Inc. (TSX VENTURE: CBJ) ("CB Gold" or the "Company") is very pleased to
report additional positive results from its second run of metallurgical testwork
on material from the Company's Vetas Gold project. The results confirm the
excellent recovery for gold and silver. The 40 Vetas ore samples tested
responded well to the gravity-flotation process, achieving combined average
recoveries of 88.6% Au and 81.4% Ag, with a large portion of the samples
reporting Au recoveries in the high 90% range and up to 99.8%.
A laboratory testing program was conducted on forty (40) drill core samples
collected by CB Gold from their Vetas Gold project to determine their
amenability to gold and silver recovery via centrifugal gravity concentration
followed by sulphide flotation processes. The samples were selected from various
areas and drill holes so as to be as representative of the deposit as possible.
The tests were conducted using the optimized process conditions from the 2013
test work program.
The results from the 2014 testing indicate:
-- Combined gravity / flotation concentrate recoveries of up to 99.8%;
-- Recoveries of up to 91.4%+ for traditional gravity gold recovery;
-- Strong recoveries occurred at relatively coarse grind sizes of P80 100
microns;
-- The Vetas samples were not found to be sensitive to grind size with
respect to metal recoveries;
-- Sulphur concentration was found to be proportional to overall metal
recovery;
For further information the reader is directed to CB Gold's website at
www.cbgoldinc.com where the metallurgical testing reports entitled "Project
Report For Metallurgical Testing on Samples From the CB Gold Inc Vetas Gold
Project, August 7th, 2013" and "Metallurgical Testing On 40 Drill Core Samples
From the Vetas Gold Project, May 16th, 2014" can be found.
Fabio Capponi, CEO, commented, "We are very pleased with the additional test
results which not only confirms the strong recoveries for gold and silver
throughout the deposit but even more the processing options, including the
possibility to produce a high-grade concentrate for direct smelting. The Company
will advance with additional metallurgical testwork as may be required by the
different processing options".
Gravity-Flotation Test Methodology
The gravity-flotation tests were carried out to evaluate the variability between
each of the Vetas samples' response to this method of recovering gold and
silver. The grind size target used for these tests was P80 100 um, which was
determined in the previous test program to be optimal. A grind time of 20
minutes was used for each sample to provide data on the variability of ore
hardness between the samples.
For each test, a 2 kg ground sample was pulped to 20% solids and fed through a
3" laboratory Knelson concentrator. The concentrate from the first pass was
cleaned by panning, and the pan tails were combined with the first-pass tails
and run through the Knelson for a second pass. The pan concentrates from both
passes were assayed for Au and Ag.
Rougher-cleaner flotation tests were conducted on the combined second-pass
Knelson tails and second pan tails to recover precious metals that are
associated with the sulphide minerals. Each test consisted of four (4) rougher
stages followed by two stages of cleaning. All tests were run at pH ~8 and used
Potassium Amyl Xanthate (PAX) and Aeropromoter 208 as collectors, along with
frother methyl isobutyl carbinol (MIBC).
Gold recovery data is provided in the following table:
----------------------------------------------------------------
Sulphur
Test No Drill Hole From(m) To(m) P80 Size Grade,
(mm) %
----------------------------------------------------------------
GF1 RM-DDH12-119 98.20 100.25 79 1.08
GF2 RM-DDH12-119 123.12 125.39 99 1.76
GF3 RM-DDH12-119 160.11 164.00 73 2.01
GF4 RM-DDH11-046 124.48 127.00 67 2.54
GF5 RM-DDH12-110 222.67 226.48 84 2.74
----------------------------------------------------------------
GF6 RM-DDH12-113 101.75 103.04 68 0.62
GF7 RM-DDH12-113 438.10 441.06 103 1.26
GF8 RM-DDH12-117 318.20 321.08 113 3.05
GF9 SI-DDH12-116 61.68 64.11 80 4.65
GF10 ED-DDH11-028 80.00 81.88 111 3.30
----------------------------------------------------------------
GF11 ED-DDH11-028 362.00 363.70 116 3.53
GF12 ED-DDH11-032 419.85 421.85 86 3.82
GF13 AR-DDH11-039 164.73 166.15 81 4.17
GF14 AR-DDH11-041 54.50 56.85 88 4.35
GF15 LD-DDH11-051 124.41 127.73 140 5.17
----------------------------------------------------------------
GF16 LD-DDH11-054 162.10 164.00 165 6.14
GF17 RM-DDH13-161 139.79 143.60 91 3.20
GF18 RM-DDH13-159 159.27 161.54 95 1.84
GF19 RM-DDH13-158 257.50 259.50 83 2.01
GF20 RM-DDH13-156 75.40 78.19 61 0.57
----------------------------------------------------------------
GF21 RM-DDH13-156 269.30 272.70 86 0.98
GF22 RM-DDH13-154 155.00 158.01 83 3.32
GF23 RM-DDH13-152 83.47 86.31 90 0.48
GF24 RM-DDH13-152 143.90 147.90 83 3.63
GF25 RM-DDH12-143 105.30 107.00 78 0.57
----------------------------------------------------------------
GF26 RM-DDH12-141 96.80 99.15 76 1.83
GF27 RM-DDH12-139 163.35 165.16 75 1.55
GF28 RM-DDH12-137 209.70 211.73 79 1.13
GF29 RM-DDH12-135 71.25 73.64 49 0.38
GF30 LD-DDH12-133 53.96 57.30 125 3.82
----------------------------------------------------------------
GF31 RM-DDH12-130 74.15 77.15 44 0.35
GF32 SI-DDH12-127 85.69 87.78 143 2.66
GF33 RM-DDH12-126 99.65 102.10 72 1.50
GF34 SI-DDH12-086 78.50 81.45 159 4.51
GF35 SI-DDH12-086 122.36 124.15 94 5.94
----------------------------------------------------------------
GF36 SI-DDH12-114 89.02 91.55 204 2.15
GF37 RM-DDH12-088 82.42 84.66 94 0.82
GF38 SI-DDH12-105 134.70 139.70 96 1.93
GF39 ED-DDH12-106A 321.43 324.80 119 3.01
GF40 RM-DDH12-113 241.60 243.92 95 2.40
----------------------------------------------------------------
---------------------------------------------------------------
Gold Grade, g/t Au
---------------------------------------------------
Flotation
-----------------------------
Total
Test No Meas. Gravity Conc. 2nd Cl. 1st Cl. Flotation
Head Conc. Conc. Conc.
---------------------------------------------------------------
GF1 0.55 175.5 15.1 7.9 1.9
GF2 18.41 1024.5 289.8 211.3 81.2
GF3 4.75 2293.9 57.0 38.9 12.9
GF4 0.90 84.2 18.6 12.3 4.9
GF5 3.51 222.9 52.1 37.8 16.3
---------------------------------------------------------------
GF6 0.50 223.8 22.7 10.1 2.1
GF7 1.23 103.0 52.4 39.7 14.6
GF8 0.48 20.6 9.5 6.6 2.2
GF9 2.14 137.4 23.8 18.3 8.3
GF10 1.29 215.2 20.1 15.3 4.6
---------------------------------------------------------------
GF11 1.52 36.6 15.0 12.6 7.4
GF12 2.04 108.7 22.3 20.6 11.7
GF13 2.87 60.2 32.9 27.1 12.9
GF14 1.71 17.3 19.0 16.1 7.5
GF15 4.59 129.6 65.4 51.9 25.6
---------------------------------------------------------------
GF16 4.21 176.9 13.8 13.7 13.9
GF17 4.43 1665.2 40.3 34.8 18.3
GF18 1.42 532.5 14.8 10.1 2.9
GF19 1.97 107.3 60.7 36.2 9.4
GF20 2.36 731.5 52.9 19.4 2.4
---------------------------------------------------------------
GF21 1.77 13342.8 293.0 226.5 60.1
GF22 2.45 48.8 41.8 34.3 15.3
GF23 0.70 25.8 6.6 1.7 0.9
GF24 1.62 529.6 15.7 14.1 6.6
GF25 2.37 55.5 16.3 11.3 7.2
---------------------------------------------------------------
GF26 3.05 2113.1 55.0 43.4 16.3
GF27 1.32 1249.8 26.5 22.4 8.4
GF28 0.08 1046.7 49.7 36.2 9.7
GF29 2.32 3011.5 144.9 38.0 4.5
GF30 1.33 72.9 17.7 14.7 7.3
---------------------------------------------------------------
GF31 1.21 666.6 30.2 9.8 1.2
GF32 3.63 449.4 50.2 40.9 18.6
GF33 8.42 109.3 187.9 146.9 43.1
GF34 2.37 102.3 34.1 26.5 14.1
GF35 4.62 588.0 22.5 18.8 11.5
---------------------------------------------------------------
GF36 3.82 41.0 38.9 34.2 15.4
GF37 30.68 27333.6 411.4 149.6 18.8
GF38 1.55 170.6 33.6 26.5 9.5
GF39 5.16 1810.1 38.8 31.7 6.9
GF40 1.22 593.8 25.4 20.3 7.1
---------------------------------------------------------------
--------------------------------------------------------------------
Overall
Gold Recovery, % Recovery
--------------------------------------------------------
Flotation
-----------------------------
Total
Test No Gravity Conc. 2nd Cl. 1st Cl. Flotation Au, %
Conc. Conc. Conc.
--------------------------------------------------------------------
GF1 37.2 52.8 54.4 58.2 95.4
GF2 11.6 67.7 72.2 77.3 88.9
GF3 59.3 39.1 39.5 40.1 99.3
GF4 9.4 77.6 80.0 86.3 95.7
GF5 10.4 85.9 86.9 88.5 98.8
--------------------------------------------------------------------
GF6 32.8 23.4 26.9 39.9 72.7
GF7 9.8 82.8 85.6 88.4 98.2
GF8 6.3 55.2 57.9 77.3 83.5
GF9 9.9 78.7 82.3 86.5 96.4
GF10 17.8 31.4 34.2 47.8 65.5
--------------------------------------------------------------------
GF11 3.3 82.8 85.9 90.8 94.1
GF12 6.9 69.0 72.6 84.9 91.8
GF13 3.3 87.5 90.1 93.8 97.1
GF14 1.5 65.2 71.2 84.6 86.1
GF15 4.6 65.8 74.9 84.9 89.5
--------------------------------------------------------------------
GF16 7.5 23.3 32.3 54.9 62.4
GF17 49.0 47.8 48.5 49.4 98.4
GF18 48.7 41.6 45.8 48.8 97.5
GF19 7.3 85.7 88.6 91.1 98.4
GF20 45.0 15.4 17.0 31.3 76.3
--------------------------------------------------------------------
GF21 79.9 15.7 18.0 19.9 99.8
GF22 2.3 86.8 91.3 95.6 97.9
GF23 2.2 5.8 12.2 38.4 40.6
GF24 39.8 55.9 56.7 58.3 98.2
GF25 2.1 4.8 11.2 36.2 38.3
--------------------------------------------------------------------
GF26 56.7 31.2 32.9 35.6 92.3
GF27 66.6 29.9 31.1 32.1 98.7
GF28 55.9 38.6 40.3 42.0 98.0
GF29 79.0 13.9 14.7 16.5 95.5
GF30 5.6 81.7 84.7 89.5 95.1
--------------------------------------------------------------------
GF31 66.6 14.0 15.2 20.3 86.9
GF32 21.8 50.1 56.0 61.7 83.5
GF33 2.4 73.2 82.9 90.5 92.9
GF34 6.3 59.5 68.5 74.9 81.1
GF35 19.9 75.3 77.3 79.0 98.8
--------------------------------------------------------------------
GF36 1.8 50.6 57.7 69.9 71.7
GF37 91.4 5.4 6.4 6.7 98.1
GF38 15.3 77.2 79.2 82.1 97.4
GF39 54.2 27.4 33.5 41.1 95.3
GF40 40.5 57.3 57.9 58.8 99.2
--------------------------------------------------------------------
The test results indicate average combined gravity-flotation gold and silver
recoveries of 88.6% and 81.4%, respectively. Gravity gold recovery among the 40
samples tested averaged 27.3%, but varied greatly between 1.5% and 91.4% and
produced an average concentrate grade of 1,535.7 g/t. It was found that in
general the samples that reported the highest gravity gold recoveries were also
the most weathered (contained less sulphur).
Similarly, the samples which contained the highest sulphur content also reported
the highest flotation recoveries. There was no clear correlation between metal
head grades and gravity or overall recoveries; however the samples with the
highest head grades did report consistently high overall recoveries.
The results of the 2014 metallurgical testing program were very positive and are
in line with expected results based on the 2013 preliminary testwork.
About CB Gold Inc.:
CB Gold is a mineral exploration company headquartered in Vancouver, British
Columbia. CB Gold, through its wholly-owned subsidiary, Leyhat Colombia
Sucursal, is actively pursuing the exploration and development of mineral
properties in the Republic of Colombia. The Vetas Gold Project consists of a
number of previously operating mines and exploration concessions.
For more information on CB Gold please visit our web site at www.cbgoldinc.com
or contact +1 (604) 630-5870, or info@cbgoldinc.com.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that
term is defined in the policies of the TSX Venture Exchange) accepts
responsibility for the adequacy or accuracy of this news release.
The securities of CB Gold described herein have not been and will not be
registered under the United States Securities Act of 1933, as amended (the "U.S.
Securities Act") or any state securities laws and may not be offered or sold
within the United States or to U.S. Persons unless registered under the U.S.
Securities Act and applicable state securities laws or an exemption from such
registration is available.
Some of the statements contained in this release are forward-looking statements,
such as estimates and statements that describe the Company's future plans,
objectives or goals, including words to the effect that the Company or
management expects a stated condition or result to occur. Since forward-looking
statements address future events and conditions, by their very nature, they
involve inherent risks and uncertainties. Actual results in each case could
differ materially from those currently anticipated in such statements.
FOR FURTHER INFORMATION PLEASE CONTACT:
CB Gold Inc.
+1 (604) 630-5870
info@cbgoldinc.com
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