What is true about most higher-grade metallic ores? (1 point)
O They are usually found very close to Earth's surface-less than 1,000 ft underground.
O Most of them can be extracted using the placer method.
O They are usually found deep below Earth's surface-more than 1,000 ft underground.
O Most of them can be extracted without requiring drilling.
1.) Directional drilling
2.)The are usually found deep below the earths surface more than 1000 feet in the ground.
3.) Holding
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To determine the correct answer, let's evaluate each option:
O They are usually found very close to Earth's surface - less than 1,000 ft underground: This statement is generally untrue. Higher-grade metallic ores are typically found deep below the Earth's surface, so this option is not accurate.
O Most of them can be extracted using the placer method: The placer method involves separating minerals from sediment using water or gravity. While this method is commonly used for certain types of metal extraction, like gold or platinum, it is not applicable to most higher-grade metallic ores. Therefore, this option is not the correct answer.
O They are usually found deep below Earth's surface - more than 1,000 ft underground: This statement is generally true. Higher-grade metallic ores, such as copper, iron, or zinc ores, are usually found at considerable depths underground. The option suggests that they are typically found more than 1,000 ft underground, which aligns with this understanding.
O Most of them can be extracted without requiring drilling: This statement is generally untrue. Extracting higher-grade metallic ores often involves drilling to reach the underground deposits. The drilling process allows miners to access the ores embedded within the Earth's crust. Therefore, this option is not the correct answer.
Based on the evaluations, the option that is true about most higher-grade metallic ores is: They are usually found deep below Earth's surface - more than 1,000 ft underground.