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2019
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
The widespread introduction of effective bioleaching technology by the leading gold mining countries including the USA, Australia, South Africa, Canada not only allowed to increase gold production by 2-3 times over the last thirty years, but also significantly reduced the cost of ore processing [1].