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PT Amman Mineral Internasional Tbk
Amman Mineral is an Indonesian mining company that digs copper and gold out of the ground, processes it, and sells the refined metals to world markets.
Amman Mineral is a copper and gold miner. It pulls ore out of the ground at a big mine in Indonesia, turns that rock into a concentrate full of copper and gold, and then smelts and refines it into metals that factories and investors around the world buy. Copper is the workhorse: it goes into wiring, motors, and power grids, which makes it one of the most important industrial metals on earth.
The company's crown jewel is the Batu Hijau mine on Sumbawa, an island in eastern Indonesia. Batu Hijau is a porphyry copper-gold deposit — a huge, low-grade body of rock where copper and gold are mixed together in tiny amounts. Because the metal is so spread out, the only way to make money is to move an enormous amount of rock and process it cheaply, which is exactly what large mines like this are built to do. The same volcanic geology that makes Indonesia earthquake-prone is what created these rich mineral deposits, so the country sits on some of the world's best copper and gold ground. Here's the wrinkle that makes Amman interesting. For years, Indonesia banned exporting raw ore, forcing miners to build smelters at home so the country captures more of the value instead of shipping rocks abroad. Amman built a big new copper smelter to comply, and that smelter is now central to its story: it lets the company sell refined metal rather than just concentrate, though it also ties up billions of dollars and adds operational risk. Gold is the quiet bonus — it comes out of the same ore as copper, so when gold prices are high, Amman earns extra money almost for free.
Amman's fortunes swing with metal prices, which it cannot control, and with how smoothly its mine and smelter run, which it can. Its biggest listed rivals include Freeport-McMoRan, which also operates giant copper-gold mines in Indonesia, and Newmont in gold. The company's main job now is getting the most metal out of Batu Hijau and its nearby deposits while keeping the new smelter humming — a simple-sounding task that, in mining, is never actually simple.
Saved answer · last researched 12 Nov 2026