The stamp mill is closely related to the recovery of gold by amalgamation, a process now obsolete.

捣碎机与现在已经不使用的汞齐法选金密切相关。

When the size of operations increased in the middle ages, the stamp mill was introduced in which numerous pestles were powered by a water wheel (Figure 8) or by horses.

中世纪处理的矿石尺寸增大了，于是人们发明了捣碎机，通过水轮或者马带动许多杵进行工作。