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New gold rush flattens Johannesburg's famous mining dumps (2014 Article)
(www.foxnews.com)
A place to discuss and learn about the restoration of disturbed lands to desirable end land uses
Yeah, often mines produce more than one metal. Copper and Zinc, or copper and molybdenum are often produced together. Similarly, gold and silver are often produced together. The issue is that there are still residual metals that are not extracted or are only partially extracted, with residual levels beyond those that are safe for human health.