time to assist the amalgamation by destroying base metals which coated the gold and silver and would not let it unite with the quicksilver.
All these tiresome things we had to attend to constantly. Streams of dirty water flowed always from the pans and were carried off in broad wooden troughs to the ravine. One would not suppose that atoms of gold and silver would float on top of six inches of water, but they did; and in order to catch them, coarse blankets were laid in the troughs, and little obstructing “riffles” charged with quicksilver were placed here and there across the troughs also. These riffles had to be cleaned and the blankets washed out every evening, to get their precious accumulations—and after all this eternity of trouble one third of the silver and gold in a ton of rock would find its way to the end of the troughs in the ravine at last and have to be worked over again