Underground mining is not generally profitable until a high enough price of Gold justifies it. This price, in the US, is about $ 500 an ounce. We have not had this price level until the last year or so. The last twenty years have seen the price of Gold at around the $ 300 level. It is only now that underground mines look attractive.
Go read the website on the last production yields of the mines. They ranged from 1 - 4 ounces of Gold per ton, before they were shut down due to low Gold prices. Now, with elevated Gold levels again, they can be re-opened.
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