heavy rare-earth elements

1

This abandoned mine in Guyun Village in China exhausted the local deposit of heavy rare-earth elements in three years .

而在中国古云镇的这一废弃稀土矿，三年就已经挖光了所有资源。
2

In this paper , the method for simultaneous determination of mixed light and heavy rare-earth elements using Kalman-filtering spectrophotometry has been studied .

本文研究了卡尔曼滤波法在混合稀土同时测定中的应用。
3

The principal metal mineral resources in this area are tungsten , tin , niobium , tantalum , lead , zinc , antimony , mercury and heavy rare-earth elements .

本区金属矿产资源以钨、锡、铌、钽、铅、锋，锑、汞及重稀土为主。