Metallurgical processes are used to employ several measurement units in order to make reference the gold content in the raw ore or concentrate to be commercialized. The typical unit measurements and their equivalences are listed below.
- 1 pound (lb) = 453.592 g
- 1 ounce (troy) = 31.1035 g
- 1 pound (troy) = 12 ounce (troy)
- 1 kilo (kg) = 2.2046 lb
- 1 metric ton (mt) = 1,000 kg
- 1 metric ton = 2,204.6 lb
- 1 short ton (st) = 907.2 kg
- 1 short ton = 2,000 lb
- 1 metric ton = st x 0.90718
- 1 short ton = mt x 1.10231
- 1 gram per metric ton (g/mt) = oz/mt x 31.1035
- 1 gram per short ton (g/st) = oz/st x 34.2857
- 1 ounce per metric ton (oz/mt) = g/tm x 0.03215
- 1 ounce per short ton (oz/st) = g/st x 0.02917
- 1 kg/mt = oz/mt x 0.0311035
- 1 oz/mt = kg/mt x 32.15075
- 1 part per million (ppm) = 1 g/t = 0.0001%
- 1 part per million = 1 mg/L (milligrams per liter)
- 1 part per billion (ppb) = 0.001 ppm
- 1ppm = 1,000 ppb