4% Zn is a good grade and keep in mind that Zn almost always occurs in conjunction with other metals that can be extracted to make up an overall Zn equivalent grade. IBG with a very large deposit in Greenland is being planned to go into production with an overall Zn grade of 4.7% (not equivalent). Other sites, less expensive to operate at, are able to be economic under that.
Ann: Spectacular High-Grade Zinc Drillhole Intersection, Alaska, page-17
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