LONDON--Anglo American Platinum Ltd (AMS.JO), the world's largest platinum producer, provided a more detailed trading update on Tuesday, saying it expects earnings to fall by between 54% and 74% in the first half from the same period last year, due to lower platinum prices and a stock adjustment in the prior year.

The South African platinum producer, which is majority-owned by U.K.-listed Anglo American PLC (AAL.LN), issued a trading update last month, in accordance to South African listing rules, to warn that earnings would fall by at least 20%.