converting ppb of Au to g/t Au

[geo78]

I got some rocks analysed and results showed an average of 15 ppb Gold. I'm trying to figure out how to confert ppb to g/t (grams per ton). Any ideas?

[Guest]

15 ppb means 15 parts in a billion parts, for example 15 g Au/ 10^9 g rock. Unfortunately, your ton (assuming a metric ton) is 10^6 g of rock, so you have 15 milligrams of gold, a flyspeck.

Sorry, but if you bought the mine, you GOT the shaft.

[tom bowens]

I got some rocks analysed and results showed an average of 15 ppb Gold. I'm trying to figure out how to confert ppb to g/t (grams per ton). Any ideas?

15 ppb is 0.015 grams per tonne gold. 1000 ppb (1 ppm) is 1 gram per tonne.

[mettyc]

There's 0.02 g/ton in most fresh lake water!

[BillK]

I submitted a sample for gold analysis. The sample was screened and each fraction was weighed and assayed for gold. Taking one fraction for example: It weighed 24 grams and the gold content was 15 ppb. How do I convert that to g/t? And how do I calculate the gold content of the total sample?