Early miners would use water power to propel gold-bearing sand over the hide of a sheep

Isa Bullion - Early miners would use water power to propel gold-bearing sand over the hide of a sheep, which would trap the tiny, but heavy, flakes of gold. When the fleece had absorbed all it could hold, this 'golden fleece' was hung up to dry, and when dry would be beaten gently so that the gold would fall off and be recovered.

This primitive form of hydraulic mining began thousands of years ago, and was still being used by some miners as recently as the California gold rush of 1849.