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THe question seems wrong . It should be that Why all minerals are not ores ?
Those substances which occurs naturally in the Earth's crust are called Minerals .And minerals which can be extracted from the Earth's crust profitably is called ores . Therefore all ores are minerals . Metals with high concentration can be acheived profitably but  not all minerals. 
Therefore all minerals are not ores. 
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yes the question is wrong
All ore are mineral but all minerals are not ore because An ore is a type of rock that contains minerals with important elements including metals. The ores are extracted through mining; these are then refined to extract the valuable element(s)
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