Placer Gold Mining Methods
The gold deposits grouped together under the name of “ placers ” comprise sands, gravels, or any loosely coherent or non-coherent alluvial beds containing gold. They have accumulated owing to the action of running water, in the beds of rivers, or on the adjoining inundation plains, or on sea beaches. They fall naturally into two […]
Siberian Sluice
The Siberian Sluice and the apparatus at Voltchanka, which may be taken as a type, consists of a head sluice and three secondary sluices, which are placed at right angles to the head sluice, and which leave it at different points and converge to a common centre, where the tailings are discharged. The head sluice […]
Beach Mining
Beach mining is a comparatively unimportant form of shallow placer mining. The sea beaches on parts of the coasts of California, Australia and New Zealand contain small quantities of gold, which have been proved, in all cases in which the matter has been investigated, to be derived from the cliffs, in which the gold is […]
How Does a Gold Dredge Work
To understand How Does a Gold Dredge Work, we may want to start by looking at California or Alaska. Gold dredging in now practised on the rivers of California, has is now superseded river mining. In river mining, an entire river was frequently deflected from its course so as to lay bare a section of its bed. […]
The Mathematics of Gravity Concentration
The rapid and comparatively recent development of flotation has opened so fascinating a field for study and research that the older processes of gravity concentration no longer receive the attention they deserve. The early work of Munroe and Richards, and the more recent contributions by Clevenger and Coe, Laist and Wiggin, Ammon, Bardwell, Crowfoot, and […]
Superpanner
The superpanner is another device worked out by Professor Haultain for the accurate panning of small samples (see Fig. 59). This is a mechanized sichertrog or gold-panning horn. The pan is trough-shaped, about 30 in. long by 10 in. wide. The radius of curvature of the bottom diminishes from the lower end to the upper end. […]
Gold Shaker Tables: Efficient Gold Recovery Solutions
Overflow from the grinding mill runs over Gold Shaker Tables which are flat and smooth and made of a fibrous wood known as “yolombo.” They are arranged in series much the same as blanket or amalgamation plate tables. The grain of the wood in the deck runs with the flow of pulp, and a sharp-pointed tool is […]
Ore Sorting & Pre-Concentration
Ore Sorting helps the economics of mining when ore becomes diluted by country rock because of narrow slopes or because of weak wall rock, or when it naturally contains barren material which is distinguishable from the ore, sorting and rejecting the worthless rock may be economical. This is done in a casual manner at some […]
Falcon & Knelson Concentrators Compared
Read these papers and try to Compare Falcon & Knelson Concentrators only to find out; they perform the same. Both use high gravity centrifugal forces to separate gold from ore with similar results. Do no be fooled by the propaganda. The laws of gravity apply to everyone whether you believe in them or not.
Sink and Float Separation Process
The Sink and Float Separation Process is an alternative to the progressive depletion, during the last quarter century, of ores which could be economically treated by the old methods of gravity concentration necessitated the development of more efficient methods of concentration, the most successful and widely used of these methods being the Flotation Process. But […]