The concentration of heavy minerals by hand in a shallow pan. Loose material is shaken backward and forward in water; heavy minerals settle and the gangue is washed out. It is a simple method for testing in the field.
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。