By Rhiannon Hoyle

SYDNEY--Iluka Resources Ltd. (ILU.AU) said it has agreed with BHP Billiton Ltd. (BHP.AU) and its joint-venture partners to reduce the royalties it earns from iron ore BHP digs up at one of its operations in Western Australia.

Perth-based Iluka receives the iron-ore royalty stream from BHP's so-called Mining Area C operations in the iron-rich Pilbara region, secured as part of the sale of a joint venture interest in the early 1990s.

On Tuesday, Iluka said the royalty agreement had been amended to increase the revenue base on which it is payable, and lower the royalty rate to 1.232% from 1.25%.

"Since the royalty agreement was entered into in 1994 the basis upon which iron ore is marketed and sold has changed significantly, for example with volume sold primarily on a blended basis and incorporating appropriate freight and insurance adjustments," the miner said in a regulatory filing. "To reflect this change, an agreement has been reached for a revised basis for the determination of the royalty."

Iluka would receive an immediate one-off payment of US$8 million, it said.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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