alluvial tin meaning in English

冲积锡
砂锡矿

After the investigation and study on alluvial tin deposit in changning dayishan mine , conclude that its geologic setting mainly iles in its structure and land form a proper scale of alluvial tin deposit were found in the limestone solution cave around dayishan granite body
摘要通过对常宁大义山砂锡矿的调查研究，总结分析了常宁大义山砂锡矿形成的地质条件主要受构造条件和地貌条件的影响。