Question

Which is the leest variety of iron ore

Answer 1

The major rock types mined for the production of metallic iron
are massive hematite, pisolitic goethite/limonite, which provide a 'high-grade' ore, and banded metasedimentary ironstone, magnetite-rich metasomatite, to a much lesser degree, rocks rich in siderite, rocks rich in chamosite which provide a 'low-grade' ore.

Answer 2

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