When they process the phosphate ore, which has Calcium Phosphate as the main source of the phosphorous that is extracted, the process creates Calcium Sulphate, gypsum, which contains a trace amount of a radionuclide (not sure which), that makes the gypsum unusable for any use, other than creating huge mounds.
What does phosphate have to do with radioactivity ?
When they process the phosphate ore, which has Calcium Phosphate as the main source of the phosphorous that is extracted, the process creates Calcium Sulphate, gypsum, which contains a trace amount of a radionuclide (not sure which), that makes the gypsum unusable for any use, other than creating huge mounds.