捣碎机与现在已经不使用的汞齐法选金密切相关。
The stamp mill is closely related to the recovery of gold by amalgamation, a process now obsolete.
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。
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.
这样垃圾捣碎机便做出了一个“三明治”，处理与运输起来就容易多了，石山回收公司的杰夫•阿斯柏（Jeff Ashby）讲道，就是此人为沃尔马公司创造了这种工艺。
The compactor then produces a “sandwich” which is easier to handle and transport, says Jeff Ashby of Rocky Mountain Recycling, who invented the process for Wal-Mart.
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