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Message: Re: conversion question
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tau
Oct 05, 2008 08:49AM
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tau
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Oct 05, 2008 12:21PM
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tau
Oct 05, 2008 12:38PM
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Oct 05, 2008 12:39PM

I learned something new. 1ppm does indeed equal 1g!

Economic gold extraction can be achieved from ore grades as little as 0.5 g/1000 kg (0.5 parts per million, ppm) on average in large easily mined deposits. Typical ore grades in open-pit mines are 1–5 g/1000 kg (1–5 ppm), ore grades in underground or hard rock mines are usually at least 3 g/1000 kg (3 ppm). Since ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.

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