A recent exploration of Cache Exploration Inc. (CAY: CA) delivered a 98% free gold recovery through Leachwell testing of the Kiyuk Lake Gold Project in Nunuvut. It announces the results of metallurgical tests from the Rusty Zone, that lies within the gold project. The high percentage of free gold recovery is welcomed as it simplifies the metallurgy of the deposit and also lowers the cost of gold recovery. It’s claimed the upcoming drilling program has a lot of potential and is soon set in motion.
To come to the result, an active accelerated cyanide leaching test from Leachwell was consulted. The reported interception of 8m @ 26.4 g/t Au (KI17-001) originating from the Rusty zone, resulting from the summer 2017 drilling, has been submitted to SGS Laboratories for metallurgical testing and metallics screening.
Research has shown that both the leaching wells and metal screens gave slightly lower Au values above the intersection of 21.5 g/t Au and 24.2 g/t Au. Compared to the original 50 g burn test results the values are also slightly lower. However, this is a less disadvantageous observation than may be initially thought, as these lower values are mainly the result of more accurate estimates of the Au content of the sample. Nevertheless the results confirm the high-quality character of the Au intersection investigated.
The analysis shows how the material is valued. For example, at SGS Red a split of 1 kg of coarse waste material from a selected high-quality cross was pulverized. Approximately 40% of this material underwent a screened metal burn test in Red Lake through a 200 mesh (75 micron) screen, with a duplicate 50g burn test of the -200 mesh material (method GO FAS30k). The +200 mesh material was then fire tested. The assay results are weighted by the respective weights of the +200 and -200 grain size fractions to calculate a total Au value for each sample.
Then 500 g of material was also sent to SGS in Burnaby for an active accelerated cyanide leach (Leachwell, method code GE LWL69K). After tumbling for 24 hours, an organic solvent (DIBK) was added to extract the Au and the solvent analyzed using AAS. This assay gives the concentration of free Au in the sample that can be extracted using cyanide. A 50 g fire assay of the tails gives the concentration of Au that was not dissolved in the cyanide. Combined, the two values give a bulk Au assay for the 500 g sample, as well as the proportion of free to encapsulated Au in the sample for the pulverization used. In this instance nearly 100% of all Au in the sample was liberated during pulverization and was available to be taken up by the cyanide solution.
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