# Gravity Separation & Concentration Methods

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## G/M3 vs PPM Conversion (5 replies and 3 comments)

GhanaBob
5 years ago
GhanaBob 5 years ago

Hello Colleagues, I want to thank each of you who added great clarity to my previous question of mass vs density measurements.

In a similar vein, how can ppm be a meaningful metric compared to g/m3? What does ppm in placer sampling really tell us that g/m3 doesn't?

Thanks for helping me clear up some of these issues.

M
Mike Rockandel
5 years ago
Mike Rockandel 5 years ago
1 like by David

Dredges for example pump m3/h. Crushers, crush t/h. Eventually you have to have the in-place density or bulk density if you are buying equipment.

GhanaBob
5 years ago

thank you Mike. so when is PPM used?

D
Deano
5 years ago
Deano 5 years ago

ppm in alluvial sampling tells you that whoever wrote the numbers has little or no experience in placer operations, be wary.

As you appear to want the definitive statement on ppm versus g/m3 here it is.

In hardrock mining all grades are given in ppm.

In alluvial mining all grades are given in g/m3.

GhanaBob
5 years ago

Deano, you da man. Thx for the clarity

P
max skinner
5 years ago

Except in the USA, but that is changing.

K
K@TTU
5 years ago
K@TTU 5 years ago

Concentrations of chemicals in water (solvent) as  written as grams per cubic meter (g/m3 ). This is the same as grams per 1,000 liters =  milligrams per liter (mg/L). Therefore, 1 g/ m 3 = 1 mg/L = 1 ppm

Terminology used as per their convenience or  as per followed procedures otherwise unit is same

antz001
5 years ago
antz001 5 years ago

How do you convert 0.106gram/liter to gram/ton?

Maya Rothman
5 years ago
Maya Rothman 5 years ago

there is 1000 litres in 1 ton

0.106 g/l = 106 g/t