Batu Hijau PROJECT

Batu Hijau, "green rock" in Indonesian, is a copper-gold porphyry mine on Sumbawa island in West Nusa Tenggara, about 1,530 km east of Jakarta. It was operated by PT Newmont Nusa Tenggara, a joint venture of Newmont, Sumitomo and PT Pukuafu Indah, and is today operated by PT Amman Mineral Nusa Tenggara. The orebody holds reserves on the order of 914 Mt at 0.53% copper and 0.40 g/t gold. When Fluor delivered the EPC contract in the late 1990s it was the world's largest greenfield mining project: a complete mine, concentrator, 17.6 km concentrate pipeline, dedicated port and power station built from nothing on an island with no existing infrastructure and a largely unskilled local workforce, against the backdrop of Indonesia's economic and political upheaval.

After primary crushing in the pit, ore moves to the concentrator on a 6.8 km overland conveyor with a 1.8 m (6 ft) wide belt, one of the longest and widest overland ore conveyors in South-East Asia at the time. Lorbrand supplied its idler rollers through Fluor, one of the company's earliest references outside Africa and the Americas, and the rollers had to withstand high humidity, monsoon rainfall and temperatures consistently above 30°C, which put a premium on sealing and corrosion resistance.

At a 2026 site visit, nearly three decades after commissioning, a large share of the original 1998 Lorbrand rollers were still turning on the conveyor, after decades of tropical humidity, monsoon rain and heat.