During bulk sample processing, rock is first crushed and screened, and the minus 6.0 mm plus 2.5 mm fraction is fed through a conveyor fitted with a metal detector so that coarse gold nuggets can be isolated and extracted for study (see Figure 1). The remaining material is set aside for further gold ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.globenewswire.com/news-release/2018/04/25/1487221/0/en/First-Comet-Well-Bulk-Sample-Yields-Numerous-Gold-Nuggets.html&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNFlOXTl_d8ActPn8ANktAEOBRg43Q
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