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They are usually found deep below Earth’s surface—more than 1,000 ft underground.
They are usually found deep below Earth’s surface—more than 1,000 ft underground.
Most of them can be extracted using the placer method.
Most of them can be extracted using the placer method.
Most of them can be extracted without requiring drilling.
Most of them can be extracted without requiring drilling.
They are usually found very close to Earth’s surface—less than 1,000 ft underground.
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The statement that is true about most higher-grade metallic ores is:
They are usually found very close to Earth’s surface—less than 1,000 ft underground.
Higher-grade metallic ores are typically located in areas where they can be mined more easily, often closer to the surface, as opposed to deep underground.
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