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On 26th February 2019, Cobalt Blue Holdings Limited (ASX:COB) which is focused on green energy technology and related metals mining like cobalt (which is used in batteries), announced its results of a large scale metallurgical test work that was conducted at its Thackaringa Cobalt Project in New South Wales. The company conducted a large-scale test work of 45 tonnes which supported more than 90% cobalt recoveries.
45 tonnes of ore sample was used to produce cobalt-pyrite concentrates, the processing of which was appointed to the ALS Burnie. To meet the upper particle size threshold, the ore was screened at 1180 microns with an oversized crush. The previous two campaigns have generated ore which is being safeguarded in the cold storage.
A follow-up programme is expected to take place in the coming months in 2019 as a further 40 tonnes â 50 tonnes of ore is currently being stored in broken hill. To this date, the amount of ore that has been extracted from the gravity is 45 tonnes, and final work is going on for the sulphide recovery from the gravity circuit tails.
With the mass recovery of 14.5%, the concentrate cobalt grade averaged 4655 ppm. From a weighted average head ore grade of 1002 ppm, the weighted avergae recovery of cobalt from whole 44.5 tonnes of huge amounts of metal to cleaner gravity concentrate was 68%. The organization expressed recovery from the scrounger float circuit will be discharged when available.
The evaluation of the cobalt substance of various sizes from the rougher and cleaner tails was done to assess the profitability of the spirals to recover cobalt-pyrite. It is as of now realized that gravity spirals are effective to 75 microns. The mass starter gravity circuit was productive in recovering for all intents and purposes most of the cobalt-pyrite in the >75-micron divisions into the gravity cleaner concentrate. Whatever remains of the cobalt, in the rougher and cleaner tails, is in the <75-micron part, and this can be recovered by a. Through scrounger floating circuit, the remains of the cobalt, in the rougher and cleaner tails, is in the <75-micron part and can be recovered.
The data certifies that the gravity spirals are exceedingly successful, and that the cobalt recovery (in this preliminary 68%) from head metal to gravity concentrate is associated with one molecule size scattering. Crushing and handling of the metal is to be overhauled in future work programs, with coarser particles sizes to update cobalt recovery on the gravity circuit and with the purpose of restricting material streams to the floating circuit.
So as to advance the cobalt sulphate generation process, ALS Metallurgy Perth has been assigned work on the refinement of metal from the leach liquors before the process of cobalt sulphate crystallization. Their work has included upscaling emptying tries out of 1kg to 3kg gatherings in 15L autoclaves (total of 20kg of feed material separated). The program will finish up the generating of cobalt sulphate. COB will use the outcome of this program to design a greater sample test program.
After this update, the stock fell by 3.2% to A$0.15 on 26 February 2019. Today,27 February, the share price corrected to A$0.16, up by 6.67%.
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