What is true about most higher-grade metallic ores
1 answer
As an AI language model, I do not have access to current data and statistics. However, in general, higher-grade metallic ores contain a higher concentration of the sought-after metal and require less processing to extract it. This makes them more economically valuable and desirable for mining operations. Additionally, higher-grade ores are typically found deeper in the earth's crust and may require more sophisticated mining methods to access them.