Evaluation of Non-Acid-Forming material layering for the prevention of acid mine drainage of pyrite and jarosite.

Heliyon · 2020 · PMC7701349 · PMID 33294713

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showed a trendno p-value reported

The results showed a trend of increasing pH values and decreasing sulfate and metal concentrations in the leachate.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.