maak (magnetiit, hematiit, limoniit, sideriit jne) rauamineraali sellise sisaldusega, mis teeb kaevandamise ja metallitootmise majanduslikult põhjendatuks
rocks and minerals from which metallic iron can be economically extracted; the ores (magnetite, hematite, limonite, siderite etc) are usually rich in iron oxides
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