groote eylandt سنگ درجه منگنز
groote معدن eylandt - malovani-pokoju-praha . Groote Eylandt - Mining Atlas. The mining operation at Groote Eylandt Mining Company (GEMCO), which was commissioned in 1965, extracts high-grade manganese ore using open-cut, strip mining methods from its 84 square kilometres mining lease on the Western side of the island.