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ANTAM’s nickel operating segment is comprised of ferronickel and nickel ore sales. Ferronickel production originated from the Company’s Kolaka Nickel Mining Business Unit. Production of nickel ore originated from the nickel mine in Kolaka, Southeast Sulawesi which was operated by the Kolaka Nickel Mining Business Unit, nickel mine in North Konawe which was operated by North Konawe Nickel Mining Business Unit, nickel mine in East Halmahera which was operated by the North Maluku Nickel Mining Business Unit, and nickel mine in Gag Island, West Papua, operated by ANTAM’s subsidiary, PT Gag Nikel.
At the end of 2021, ANTAM’s consolidated nickel reserves (considering the reserves of PT Gag Nickel) were recorded at 381.91 million wet metric tons (wmt) consisting of 332.69 million wmt of saprolite nickel ore and 49.22 million wmt of limonite nickel ore. ANTAM’s total consolidated nickel resources (considering the reserves of PT Gag Nikel) in 2020 was recorded at 1,408.73 million wmt consisting of 898.05 million wmt of saprolite ore resources and 510.68 million wmt of limonite ore resources.
ANTAM's nickel ore deposits are generally not very deep. Limonite nickel ore layer is above the saprolite layer. This makes limonite mining cheaper and limonite mining is complete before saprolite. Nickel ore is mined using the selective open pit mining method with backhoe equipment for excavation and trucks for transportation. No drilling or blasting is required in nickel ore mining or any complicated processing, other than drying and screening ore. In the ore screening process, large ore is obtained which requires additional processing to crush the nickel ore rock to the desired size.
ANTAM conducts open pit mining method with a selective mining to produce high grade and low grade nickel ore. Nickel ore is used for ore feed for Kolaka ferronickel plant as well as being sold to domestic market. ANTAM sun dries its mined nickel ore before being screened to be crushed into desired size. Ore is transported using belt conveyor to the stockpile area before the end of being used in ferronickel processing or transported to domestic customers.
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