venture to think it would serve the purposes of this paper well, if I
were to quote from a late work published by M. Walter A. Skidmore, U.
S., Deputy Mineral Surveyor and Assayer, on gold mining and loss of
" The losses of precious metals, in their treatment, may be classed as follows:—
1st. Fine gold passing the screens and carried by the current of water
over the blankets, plates, and other appliances of amalgamation. Some
coarse particles are flattened by the stamps, and expose a large
surface in proportion to weight; these also float on the water current.
"2nd. Gold enfilmed with sulphurets of iron, copper, arsenic, &c,
whereby it is rendered unamalgamable.
" 3rd. Gold held by 'floured'' mercury.
" 4th. The incidental loss of mercury.
" 5th. Silver, either free or in association .with gold.