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Screen assays increase Zackly gold grades


Last updated 2/16/2018 at 4:21am

Kyle Negri, Courtesy of Millrock Resources

The 2017 drilling at Zackly cut skarn mineralization with coarse gold and copper.

PolarX Ltd. Feb. 7 reported that screen fire assays from the 2017 drilling of the Zackly deposit at its Alaska Range project have returned roughly 37 percent higher gold grades than the results of the initial conventional fire assays.

Screen fire assays, which involve screening a large pulverized sample and analyzing the larger material separate from the material that goes through the 75-micron screen, is the most accurate way to assay material known to contain coarse gold.

Historical reports and PolarX observations indicate that substantial amounts of coarse gold are present at Zackly. PolarX therefore re-submitted 35 drill core samples for assay using the screen fire assay technique which is generally accepted as more accurate in the circumstances.

The screen fire assays returned an average grade of 2.7 grams per metric ton gold for the 35 samples, compared to the 1.97 g/t average previously reported.

Given this significant difference, PolarX submitted roughly 100 core samples, which is the balance from the 2017 drilling, for screen fire assay.

Native copper has also been observed in Zackly core and the company is using the screen fire assay technique to analyze the samples for copper.

The coarse native gold and copper could mean that a portion of these metals could be recovered using gravity separation and PolarX plans to evaluate this potential as part of its metallurgical program.

The company intends to use screen fire assay on all future samples from drilling at Zackly.



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