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A comment on Tackling youth unemployment by growing mushrooms from coffee waste. Parent comment

Re:Tackling youth unemployment by growing mushrooms from cof... by test1235 on Wednesday August 01, 2018 @09:48AM (#17662429)
That doesn't sound like much? That's less than 100USD per tonne (approx $40/g current gold price)

Is there much other valuable stuff in the ash to make the venture worthwhile?

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Re:Tackling youth unemployment by growing mushrooms from cof... by msl on Wednesday August 01, 2018 @10:30AM (#17662781)
I dug up the original article for some fact checking, and it seems my previous post has a few mistakes in it. There are "grams" of silver and gold (each or together? The article does not specify.) and "kilograms" of copper in a tonne of ashes. Other metals are also extracted, but their amount or value is not specified.

It further turns out that there is a monetary payment for the service, but it is low because of the valuable metals. The article also tells that the machine can sort around 100000 tonnes of ashes annually.

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Re:Tackling youth unemployment by growing mushrooms from cof... by jdietrich on Wednesday August 01, 2018 @12:48PM (#17664253)
According to this article, a good open-pit gold mine has deposits of about two grams per tonne.

http://www.mining.com/web/making-the-grade-understanding-exp...

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