Gold Dredging Methods & Systems
At present dredge mining in this country is at a low level. The last gold dredge in California stopped operating in October 1968. Gold dredging in the adjacent States had already ceased because of increasing operating costs, decreasing placer values, and the fixed price of gold. Two gold dredges and one platinum dredge were still […]
Flour Gold Recovery
Flour gold can be defined as ultra-fine gold found in a low micron size fraction, often smaller than 74 microns or 200 mesh. Reality is that with today’s fine gold recovery equipment, this is a low ways away from the elusive microscopic gold small prospectors want to know how to recover. Falcon’s iCon gravity […]
Shaking Table Motions
Shaker tables, as the name implies, utilized a Shaking action for conveying the refuse and discharging it over the refuse end. The tables were hung from rods attached to overhead supporting beams. A shaft and cam arrangement at one end of the table served as the actuating mechanism and imparted to the table an endwise, […]
CMI Centrifuge
The CMI centrifuge is a positive discharge scroll type centrifuge employing a profile wire screen mounted within a basket which is fastened to an outside rotating frame and an inside solid cone equipped with spiral flights. The belt driven gears produce a differential speed in the two (2) rotating elements. Both elements rotate in the […]
Diamond Dredge
With regards to diamond dredges and dredging, the kings of the 1970s were Consolidated Diamond Mines and Marine Diamond Corp. both parts of the famous DeBeers company, control the coast of the Namib Desert and the waters and more important, the ocean floor and beaches of this treasure cheat of gems. So rich were the original […]
Knelson Concentrator
The Knelson Concentrator relies on an enhanced gravitational force together with fluidization process to recover even very micron sized particles. First water is injected into the rotating concentrating cone through series of fluidization holes. Then feed slurry is introduced through a stationary feed tube. Once the slurry is filled in each cone, create a concentrating bed […]
Understanding the Gold Centrifuge by Comparing it with a Sluice Box
Centrifugal separation of gold experienced a regain in activity with the advent of the Knudsen Bowl. This device appears extremely efficient in recovering fine gold, although very little published data are available. Installing a gravity plant increased overall gold recovery by about 3-4% in some plants. Gravity concentration was achieved with pinched sluices and 76cm […]
Extraction of Chromium from Chromite Ore
Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite ore imported into the USA, the metallurgical industry consumed about 59 pct, the chemical industry […]
Hydraulic Dredge Design
Let us assume that it is desired to design a hydraulic dredge capable of raising average hydraulic material 15 feet above the pump through 4000 feet of pipe line and at the same time be suitable for general all round work involving also short lines and low heads. It is generally accepted that a 20 […]
Scows
The most common conveyance for the transportation of dredgings (pumpings excepted) is the bottom-dump mud scow. It is in effect a hopper barge, without means of self propulsion, consisting simply of a hull rectangular in plan and cross section, containing a number of independent hoppers called pockets, and with both ends raked or rounded (in […]