also,
about every half hour, through a buckskin sack. Quantities of coarse
salt and sulphate of copper were added, from time to 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 some day.
There is nothing so aggravating as silver milling. There never was any
idle time in that mill. There was always something to do. It is a pity
that Adam could not have gone straight out of Eden into a quartz mill, in
order to understand the full force of his doom to "earn his bread by the
sweat of his brow." Every now and then, during the day, we had to scoop
some pulp out of the pans, and tediously "wash" it in a horn spoon--wash
it little by little over the edge till at last nothing was left but some
little dull globules of quicksilver in the bottom. If they were soft and
yielding, the pan needed some salt or some sulphate of copper or some
other chemical rubbish to assist digestion; if they were crisp to the
touch and would retain a dint, they were freighted with all the silver
and gold they could seize and hold, and consequently the pan needed a
fresh charge of quicksilver. When there was nothing else to do, one
could always "screen tailings." That is to say, he could shovel up the
dried sand that had washed down to the ravine through the troughs and
dash it against an upright wire screen to free it from pebbles and
prepare it for working over.

The process of amalgamation differed in the various mills, and this
included changes in style of pans and other machinery, and a great
diversity of opinion existed as to the best in use, but none of the
methods employed, involved the principle of