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Message: <blockquote data-quote="user 4386" data-source="post: 647370" data-attributes="member: 4386"><p>If it is in pure quartz you can estimate it very accurately. You can find the combined SG and you know the SG of gold and quartz. So you can calculate how much gold has to be added to quartz to give the combined SG. You can get a fair estimate even if it is not in quartz, by using an approximate rock SG if you know the rock. However, you will be fairly close if you use a value like quartz (2.65 - corrected since first post) since rocks only range from 2.2 to 3.4 and gold is 19.3, A huge difference. Only problem is when there are a lot of other sulphide minerals. This is how specimens are valued. You shoukld not lose with a good specimen because you should be charging a surcharge over the actual gold value.</p></blockquote><p></p>