Rock containing sub-economic material from which economic mineral deposits may form by geologic concentration processes such as supergene enrichment. A protore may become profitable with technological advance or change in market value.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。