Unground Natural Calcium Phosphates, Natural Aluminum Calcium Phosphates & Phosphatic Chalk

Unground natural calcium phosphates and aluminum calcium phosphates are primary feedstocks for phosphate fertilizer production and animal feed supplements, entering the US under a single tariff line (2510100000) that specifically covers material in its unground, run-of-mine state. The unground designation is commercially significant because it distinguishes this heading from the ground form (heading 251020), which commands different pricing and end-use applications. Peru and Canada are the leading suppliers of unground phosphate rock to the US market.