(Reuters) - Impala Platinum said on Thursday its half-year profit declined 43%, mainly due to lower metal prices.

The world's second-largest producer of platinum group metals said its headline earnings fell to 1.85 billion rand ($100.15 million) in the six months ended December 31, down from 3.26 billion rand a year earlier.

($1 = 18.4725 rand)

(Reporting by Nelson Banya; Editing by Jamie Freed)