By Alex MacDonald

LONDON--South Africa-based gold miner Harmony Gold Mining Co. Ltd. (HAR.JO) said Thursday it continues to encounter significant intervals of additional gold and copper mineralization at its Kili Teke prospect in Papua New Guinea.

The miner said it encountered 186 meters of rock with 1.02% copper grade and 0.72 grams of gold per metric ton of ore. It added that there was more potential resource in the region.

"In a world where new discoveries are rare, we are encouraged by the prospect that Kili Teke could well develop into another major copper-gold discovery" said Chief Executive Officer Graham Briggs.

The company said the mineralised footprint is growing as the drilling progresses, and the grades are similar to the OK Tedi and Frieda River projects.

Write to Alex MacDonald at alex.macdonald@wsj.com

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