Potash Ore Grades – Check the Units
Therefore when comparing potash resource grades between deposits, one must be vigilant for the units used since there is a significant difference. The conversion from K2O to KCl is based on the formula K2O = 0.6317 x KCl. So a grade of 25% K20 is equal to 25/0.6317 = 39.6% KCl. The KCl grade value is significantly higher.