If they have solved the water issue, they would be the first to issue a PR that they have finally resolved it. Since the company hasn't definitively stated that it's solved even with the improvements and given the low recovery rate it's not too much of a leap to conclude that water is still an issue. If you listen to the call it takes about half an hour to clean out the concentrator every four hours. Since you're asking for evidence, do you have any evidence that they've solved the clean water and concentrator issues. Sure they've installed the new equipment, but there's no evedence that the problem has been solved. If the gravel is that low in quality itwouldn't be economic to mine it.
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