Foam Concrete Seals for Abandoned Mine Shafts and Adits
Investigate and demonstrate the possible use of low-density (45-lb/ft³) foam concrete for sealing abandoned mine openings. Although foam concrete has been used in the construction and geotechnical industries tor some decades, it has not previously been used in abandoned mine shaft reclamation. Approach A structurally engineered permanent mine seal for an abandoned coal mine shaft, […]
Zero Order Production of Fines in Grinding
The phenomenon of zero order production of fines associated with the batch comminution of monosize feeds in tumbling mills has been examined in the context of the size discretized population balance model. It has been shown that the model admits zero order production kinetics only in an approximate sense. The necessary and sufficient conditions for […]
Gold Prospecting in Quebec
The prosperity of any nation depends, to a large extent, on its natural resources such as oil, coal, metal, timber, water-power, and fertile soil. Each one of these resources forms the basis of a huge industry. The mining and smelting industry ranks among the first since it paves the way for a number of other […]
Prospecting for Fine Gold
Methods used to determine the quantity of gold present in a sample vary according to the type of prospecting being done, and the manner in which the work is carried out. These methods can be classified as: dry-blowing panning other gravity concentration methods such as jigging, tabling and cradling centrifugal concentrating amalgamating spectrographi analysis fire […]
The 10 DEEPEST Diamond Mines in the World
The accumulation of diamonds has come a very long way since the first examples of this hugely precious stone were discovered in India in around 400 BC. Most of the world’s diamond deposits were formed over 1 billion years ago, yet gaining access to them has necessitated the development of hugely sophisticated modern technology. As […]
The 10 MOST VALUABLE Diamond Mines in the World (by Reserves)
Diamond mining is one of the most prestigious and profitable industries in the world. The ten largest diamond mines in the world by measurable reserves contain more than one billion carats of recoverable diamonds, and this naturally translates into many billions of dollars. It’s thus intriguing to look at how these carats are distributed. 10. […]
Cone Crushers: Types, Benefits, and Applications
Introduction Compared to the gyratory crusher, the cone crusher is characterized by its higher speed and a flat crushing chamber design which is intended to give a high capacity and reduction ratio for materials suitable to this type of processing. The aim is to retain material longer in the crushing chamber to do more work […]
Prevent Silver Jarosite Formation
Pressure oxidation of refractory (arseno)pyrites results in residues from which nearly all the gold can be recovered. This is not the case for silver. Under prevailing autoclave conditions, which favour hydrolysis and precipitation of ferric iron, the silver becomes associated with jarositic species, limiting its subsequent cyanidation to less than 10 %. Effective enhancement of […]
Hydraulicking
Hydraulicking: In hydraulic mining a stream of water under high head is employed to break down the bank and excavate the gravel and to sweep it to the sluices. Additional running water (termed “bank” or “by-wash” water) usually is required to wash it to and through the sluices. The gold is recovered in part from cleaning […]
Biaxial Compression Tests
Purpose In the past several model studies of the behavior under load of both randomly (4) and regularly jointed rock masses have been published. The studies of regularly jointed masses involved block models composed of a large number of blocks of equal shape, such as square, hexagonal and parallelepipedal, both with continuous and discontinuous joints. […]