What are ores? Give example. What are ‘placer deposits’? Give example of mineral found in such deposits. -Geography

What are ores? Give example. What are ‘placer deposits’? Give example of mineral found in such deposits. -Geography
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The term ‘Ores’ is referred to the gathering of such minerals which are mixed with other elements. To make its extraction sodium salt, the mineral content should be in sufficient concentration of the ore. For example – Iron ore is the basic mineral with excellent magnetic qualities. India is one such country with good quality of iron ores. Magnetite and Hematite are the finest and important industrial iron ores respectively.  ‘Placer deposits’ have those minerals which are not destroyed by the water. These are such minerals which are found as alluvial deposits in sands of valley floors and the base of hills. Minerals found in such deposits are Gold, Silver, Tin and Platinum.
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Why was placer mining the most widely used method or mining for gold?

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