ore occurrence

例句：

1. 1. The geologist found a new type of mineral in the area.
   地质学家在该区域发现了一种新的矿物。
2. 2. The mine has experienced several ore occurrences in recent years.
   该矿场近年来经历了几次矿床出现。
3. 3. Ore occurrences are important for understanding the Earth's history.
   矿床出现对于理解地球历史非常重要。