Rock experts are people who specialize in the study of rocks and minerals. Miners are individuals who extract minerals from the earth, usually through mining. They are responsible for extracting valuable resources such as coal, gold, and other minerals. Miners must have a good understanding of geology and the tools necessary to safely extract minerals from the earth. They must also be able to identify different types of rocks and minerals. Rock experts are often consulted by miners to help them identify the best places to mine and the most efficient methods of extraction.