This test complements those test results released on
Highlights
A 24-hour agitated leach test using the thiosulphate leach agent, at a grind size of 80% passing 75-microm, recovered 92% of total gold content.
The head grade of the sample treated compares well with the original assays of the diamond drill composites making up the sample (50g fire assays). The original assays from the drill samples gave 1.07g/t gold. The Clean Mining laboratory head grade (500g sample) gave 1.04g/t gold. The Clean Mining leach test resulted in a back-calculated head grade of the sample (after leaching) of 1.10g/t gold (1000g of leach test sample). These results underline the consistency of the mineralization.
A cyanide leach test was also conducted in parallel using the same grind and leach time and yielded a gold recovery of 91%. These results correlate very well with recently announced cyanide leach tests carried out in the Testwork laboratory in
Final drill results from a series of reconnaissance drill holes completed during 2022 at the Santa Helena project returned several notable intercepts including 0.8m @ 44.8 g/t gold and 0.9m @ 10.4 g/t gold.
Altamira Gold President and CEO,
Consulting metallurgist
CAJUEIRO PROJECT
The Cajueiro project is located approximately 75km NW of the town of
Maria Bonita Metallurgical results
Following completion of holes MBA001-MBA004, a representative composite sample of fresh rock mineralization was prepared from assay sample coarse rejects, returned from the analytical laboratory. The sample weighed 5kg and was comprised of 15 subsamples of individual core intervals, each of which measured 0.77-1.5m.
The samples were submitted to Clean Mining and the testwork was conducted at SGS Australia and
Clean Earth Technologies (CET) is a
The testwork programme involved crushing and grinding the sample to 80% passing 75 microns. Standard bottle roll leach tests were conducted using 1000 g of sample repulped to 40% solids, with pH adjusted to 5-7 for Clean Mining's reagent and 10.8 for a comparable cyanide leach test.
For the Clean Mining leach test, 31.2 grams of clean leach reagent (CLR), equivalent to 20 grams of reagent per litre of liquor) and 5.6 grams of clean leach enhancer (CLE) equivalent to 3.7 grams of reagent per litre of liquor were added. The concentration of reagents and the pH were monitored for the duration of the test. After 48 hours of leaching, the pulp was filtered and washed with three displacements of water.
The results indicate a consumption of 3.59 kg/t of CLR and 0.36 kg/t of CLE and an average gold recovery of 92.1% within 24 hours. As concluded by Clean Mining, 'The ore has shown low reagent consumption, high gold recovery and fast leaching kinetics'.
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