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Answer :
Final answer:
The mining method descriptions include surface mining, which involves drilling and blasting followed by transportation, subsurface mining for extracting deeper materials, and placer mining that utilizes water for mineral concentration. Each method applies to different types of materials and mining conditions. Understanding these methods helps to identify their applications based on the resources being extracted.
Explanation:
Mining Methods Descriptions
In the context of mining, two primary methods are used based on the type of material being extracted. Below are descriptions that match specific mining methods:
- Surface Mining: This expensive method drills and blasts the rock and then moves it by truck, elevator, or belt conveyor. It is typically used for extracting minerals that are located close to the surface, ensuring efficient removal and transportation.
- Subsurface Mining: This less expensive method drills and blasts hard rock, but some softer materials can be mined without the use of blasting. It is employed for minerals located deep underground where conventional surface mining methods are not feasible.
- Placer Mining: The mined materials are washed with water to concentrate the heavier minerals. This method is often used for mining gold and other precious metals found in riverbeds or sediments.
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