Dredge Mining
The dredge selected for the project was the Para. It is purportedly the largest discountable dredge in the world. Two weeks after its arrival at the project site by rail, the Para was ready to operate. The Para has a 0.75 m (29½ inch) suction and a 0.70 m (27½ inch) discharge. It has 600 […]
Thickener Performance Optimization
The results of this study can be shown as counter plots. Due to the variety of experimental runs and generation of numerous plots it would be beyond the limits of this paper to discuss all of the cases. Therefore, the discussion will be based on the plots given in Ghalambor (1980), and only a few […]
Install Jig in Grinding Circuit to Recover Gold
The project consisted of installing one jig and one belt strake on each of the four grinding sections. A portion of the circulating load in the ball mill circuit is pumped to the jig. The jig is placed over the top of the belt strake. The concentrate from the jig flows onto the belt strake. […]
CIL Tailings Gold Flotation
A preliminary series of laboratory flotation tests was performed to determine the nature of the unleached gold values of the CIL tailings. The gold in the Mercur mining district has been identified historically as being associated with sulfide and carbonaceous minerals in addition to a percentage occurring as free gold. Test results indicated that higher […]
GORE-TEX membrane filter cloth
GORE-TEX membrane filter cloths for liquid filtration consist of expanded polytetrafluoroethylene (PTFE) membranes bonded to a variety of felts and other fabrics (including fabric woven of PTFE fiber). The PTFE membrane/PTFE fabric filter cloth is inert to practically all chemicals and can be used at temperatures up to 500°F (260°C) . These materials combine the […]
Countercurrent Tower Process Gold Leaching
The Kamyr countercurrent tower leach process consists of a true countercurrent leach with a flocculated ore and fibre mixture entering the top of the tower and a cyanide solution or alternative lixiviant as well as a barren wash solution entering the bottom of the tower. The Kamyr countercurrent tower leaching system has been developed for […]
Lithium Spodumene Bio-Leaching
A culture of niger used in this study was obtained from Professor Stoyan Groudey of Higher Institute of Mining and Geology, Sofia, Bulgaria. It was maintained on Czapex-Dox agar medium (Booth, 1971) containing 100 x 10 -6 m³ distilled water, 3.0 x 10-³, kg sucrose, 0.3 x 10-³, kg NaNO3, 0.1 x 10-³ kg K2HPO4, […]
Continuous Elution for Extraction of Gold from Carbon
The continuous elution process is a continuous counter-current system operating in a pressure vessel at elevated pressure and temperature in which both carbon and the eluate are simultaneously moving through each other in opposite directions. During this process the carbon particles enter the top of the vessel loaded with gold and exit barren through the […]
Hydrochloric Acid Leaching of Merrill Crowe Precipitate
Significant copper levels were anticipated in the precipitate due to cyanide soluble species in the ore. Original design called for a hydrochloric acid leach of precipitates to remove excess zinc and copper prior to fusion. It was thought that the use of hydrochloric acid would result in low silver losses because of the low solubility […]
Flash Flotation of Gold
The Outokumpu flash flotation concept as an approach for precious metals recovery. Concerns were: Could a concentrate be recovered from coarse, high solids cyclone unflow. Would the proposed flash flotation machine operate on 2 continuous basis or would machine be down frequently because of plugging. Freeport was well aware of the mechanical problems with unit […]