157. Plate 7 will give the reader a good idea of the general arrangement of a plant for treating, per day of 24 hours, from 1 1/2 to 3 tons of concentrations containing gold and silver. The appended description will also serve as an inventory of the principal articles required:

A - Two hearth roasting furnace; A A' - The same extended to three hearths; B - Drier; C - Smoke stack; D - Floor, level with top of drier, with storeroom beneath; E - Hopper; F - Boiler, for heating purposes, set in flue; G - Passage way under flue; H Plan of Works.

Plate VIL Plan Of Works.

Plate VIL Plan Of Works.

Melting furnace; k - (dotted) Small roasting and drying furnace for precipitate - inside drier; l - Sheet-iron muffle for drying gold; m - Assay furnace; n - Doorway to laboratory; o - Steps to lower floor; p - Tank for hypo; qqqq - Leaching vats; r r - Silver precipitating tubs; s - Calcium sulphide vat; t - Well and pump; u u u - Filters for precipitate; v v - Gold precipitating tubs; w - Iron sulphate vat; x - Small tub to receive washings from vv; y - Filter tub for waste solution; z - Gasometer. or blower; a - Chlorine generator; b - Wash-bottle; c c - Cars for removing tailings; d d - Tram-ways, 6 feet above floor; e -Press for silver precipitate.