Additional Metallurgical Results for Its Vetas Gold Project
VANCOUVER, BC - CB Gold Inc. reported additional positive results from its second run of metallurgical test work 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.
Fabio Capponi, CEO, said, "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 test work as may be required by the different processing options".
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 m, 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.