Gold mining machinery; its selection, arrangement, & installation: a practical handbook for the use of mine managers and engineers, including ... preparation of specifications and estimates

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...motion; the longitudinal traverse or stroke can be set by altering the eccentric, and the angle of the springs, or vertical movement of the table, by altering the length of the connecting rod. The table itself is supported on a frame, and by the elevating screws provided the inclination of the working surface with regard to the frame may be altered; by these means different inclinations can be given to opposite ends of the table. It is evident the range of adjustment is considerable; the flow of the water film across the surface may be regulated both in quantity and speed, and will be in constant agitation during its passage to the lower side. Each table is 16 ft. long by 7 J ft. wide at the large end, the motive force does not exceed half a horse-power, and the pulp is generally delivered to the machine as it leaves the battery. Each table treats on an average 20 to 25 tons per twenty-four hours. The simplest method of erection is to support the lower frame on cills parallel with the length of the table, the two centre ones being extended to carry the driving shaft and bearings; these cills should be bedded in, and bolted in concrete. The wearing parts are few and the wear light, provided the foundation is sufficiently stable to prevent any racking between the driving shaft and table. Cyanide Plant---As the tonnage to be handled in this process is generally considerable, the location of the site is an important feature, economic conditions being fulfilled in one that permits automatic filling and offers sufficient fall both for the process itself and the discharge of the residues. An ideal site, with fall to the required amount, is seldom available; and owing to the grade required to prevent settlement of pulp in the tailings launders, which amounts to at ...