earth that contains valuable minerals or metal such as gold （含贵重矿物或金属的）矿石，矿砂
Idioms
hit/strike pay dirt
- (informal)
to suddenly be in a successful situation, especially one that makes you rich 骤然成功；暴富 The band really hit pay dirt with their last album. 乐队的最后一张专辑确实打击了薪水。