Evidence for the floatability of sulphide minerals without collector is analyzed and it is shown that results obtained with ores, in contrast to those with single minerals or mineral mixtures, depend on many additional variables, some identified and others not. Because of the prevailing low levels and costs of collectors for most sulphide ores, it … Read more
Using a Mark IV surface force apparatus, adsorption of dodecylamine hydrochloride on mica has been studied at pH 5.7 in the presence and absence of octanol. With amine alone, the repulsive forces between mica surfaces are reduced due to charge neutralization and attractive hydrophobic force; however, the latter is of relatively short-range with its decay … Read more
Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise, the choice of a cutoff grade policy to be used during an exploitation of a deposit is not. Use of simply calculated breakeven cutoff grades … Read more
Kaolin is a white, naturally occurring, hydrated aluminum silicate that is formed by the weathering of feldspar. Commercially significant deposits of paper grade kaolin are located in Georgia and South Carolina in the southeast United States, the Cornwall District of England, Brazil, and Australia. Kaolin deposits are classified as primary or secondary deposits depending on … Read more
Dewatering of a surface or underground mine can be a significant production cost. Total costs include both the capital costs for wells, pumps, and water-disposal facilities and the operating costs for pumping, treatment and disposal of the water. Such costs are minimized when the present value of the capital and operating costs is minimized. The … Read more
The transport of slurry within the ball mill depends on the peripheral velocity and porosity of the ball charge. Residence time distribution and mill hold up are often used as indicators of the mode of transport. In this work, the transport problem is tackled via direct simulation of the three dimensional motion of the ball … Read more
Diminishing worldwide reserves of high-grade ores requires research be conducted to develop methods to recover metals from low-grade ores. Low-grade ore deposits are often unprofitable to mine and process because of the rising costs of energy and expense to protect our environment. Biological processing can be quite selective, is environmentally benign, and has the potential … Read more
The ability to process complex precious metal sulfide concentrates containing antimony and arsenic, in an economic and environmentally safe manner, is an important problem facing the mining industry in the United States. Preliminary experiments have been performed to evaluate the possibility of treating a complex sulfide concentrate to recover antimony and precious metals while fixing … Read more
The American Girl Mining Joint Venture is an equal partnership between Eastmaque Gold Mines, Ltd. of Vancouver, BC Canada and MK Gold Company, a wholly owned subsidiary of Morrison Knudsen Corporation of Boise, Idaho. Underground mining and open pit methods are used to supply ore to the processing areas. Heap leaching of ore grades in … Read more
In-Situ mining at San Manuel, initiated in 1986, has evolved from a system utilizing an underground collection gallery to recover gravity drainage pregnant leach solution to a system primarily utilizing well-to-well leaching and recovery. This shift in production methodology began in 1989 after a study of the feasibility of well-to-well leaching. This study led to … Read more