Small Mine Operation Shattuck Denn’s Bardon Mine
Small tonnage ore bodies can be developed at a profit on a short life basis. Such is the case of the Bardon Mine in the Big Indian Mining District in San Juan County Utah. Faced with a small initial tonnage of high grade uranium ore, the Shattuck Denn Mining Corporation Engineers developed some new ideas […]
Retention Time in Continuous Vibratory Ball Milling
Basic Principles: In a batch mill the length of time during which the material is ground is a direct measure of the energy expended on the material, except possibly for exceedingly fine grinding. The following analysis pertains to a continuous mill operating under these conditions. dE = -C dx/x n…………………………………………..(1) where dE is an infinitesimal […]
Pulp Density Measurement and Control
Measuring the specific gravity of a pulp in concentrating plants is a relatively simple procedure, but the desired accuracy is often difficult to attain. Many plants use the system of weighing a known volume of the pulp on a scale. In many cases, this method is quite accurate, but obtaining a true sample presents quite […]
Processing Bastnasite Ore
Average composition of ore from the San Bernardino deposit is less than 0.1 pct ThO2, 25 to 35 pct calcite, 10 pct rare earth oxides, 15 to 20 pct silica, and 30 to 40 pct barite. Rare earth content of the ore analyzes 50.7 pct CeO, 4.2 pct Pr6O11 11.7 pct Nd2O3, 1.3 pct Sm2O3, […]
Magnetic Roasting of Marginal Iron Ores
An experimental procedure was developed for studying magnetic roasting on a accurately-controlled laboratory scale. The loss-in-weight method was used and the course of reduction could be followed under a reducing gas atmosphere containing as many as five different components. Some important variables of the operation were checked on a marginal Mesabi iron ore containing porous […]
Magnetic Recovery of Germanium Sulphide
The Kipushi deposit, where the Prince Leopold Mine has been installed belongs to Union Miniere du Haut-Katanga and is located in the Belgian Congo, 20 miles SW of Elisabethville, at the vicinity of the Northern Rodhesian Border. How does germanium occur Differentiation of renierite from regular bornite on a freshly cleaved surface is uneasy, but […]
Effect of Pulp Depth and Pulp Density in Thickening
The two principal attributes of a thickener pulp are its settling rate and the ultimate pulp density of the thickened mud. Testing for evaluation of thickening attributes of a pulp has usually been done batch-wise by placing the pulp in a one-liter glass graduated cylinder and noting the position of the boundary between clear liquor […]
Deep Well Turbine Pumps
Deep Well turbine pumps receive constantly increasing application to the problem of mining water and other fluids from great depths. Many installations of medium settings are presently operating successfully and it is felt that much greater depths are immediately within reach. Settings and lifts in excess of 2000 feet are not at all out of […]
Copper Segregation Process
The recovery of copper from low-grade oxidized and mixed oxide-sulfide copper ores by acid leaching is standard practice in the Southwest. Some ores, however, are unamenable to this method of treatment owing to excessive acid consumption by calcite or other acid-consuming gangue minerals. Other ores present a handling problem because of the presence of clay […]
Heavy Rare Earths Separation by Ion Exchange
The equipment for the separation of the rare earths consists of nearly 200 columns thirty inches in diameter by twenty feet high. They are constructed of materials which will not contaminate the rare earth products. Most of the cation exchange resin in the plant is a styrene-divinylbenzene sulfonic acid resin such as Amberlite IR-120 and […]