Material, such as gravel or slag, from which metal is extracted in mining.
Material, such as gravel or slag, from which metal is extracted in mining.
矿渣诸如砂砾或矿渣等物质，可从中提取金属
Material, such as gravel or slag, from which metal is extracted in mining.
矿渣诸如砂砾或矿渣等物质，可从中提取金属