Gold tons are also called metal tons, not formal units. When calculating the price of ore, it is usually not based on the amount of ore, but on the amount of metal contained in the loaded ore. For example, an iron ore with a content of 50% (technically called grade) and a price of 600 yuan per metal ton, 1 ton× 50 %× 600 = 300 yuan. If the grade is 58% and the ore price is 1× 58 %× 600 = 348 yuan, it is easy to calculate. Otherwise, if you buy ore, the first car's grade is 50%, the second car's grade is 50.5%, and the third car's grade is 6 1.25% ... you have to set countless prices!
Gross weight ton (natural ton): the weight after direct weighing including packaging.