Froth Flotation & Gravity Concentrating Pilot Plant For Gold Ore

A bank of 4 Denver Sub A Flotation Cells, 750 Cubic Foot per cell, overflowing the froth product.  Flotation is used in gold, mineral processing, copper, coal, to recover fine particles, typically finer than 0.5 mm.  Chemical and physical attachment of the solid particle to the bubble, induced by the chemical reagents and conditioners would be a over simplified description of froth flotation.   
Deister Table, being used in a small gravity gold concentrating plant located in Ecuador.  This particular mine processes both placer (loose rock and gravel) ore as well as lode or vein ore.  They crush the ore in a KueKen Primay Jaw crusher, further reduce the ore in Denver dual roll crushers and finally use rod and ball mills to reduce the particle size of the ore to between 60 and 100 mesh.  The crushed ore is then processed in a slurry form, fed to deister tables, such as the one in this photo, with gold and certain heavy minerals being separated from the abundant quartz.   The final concentrate is then "cleaned" on a secondary series of Deister Tables, to separate the gold from the other heavy minerals, such as zircon, garnet, ilmenite and magnetite    
A 6' x 10' Ball Mill ,with a spiral classifier, classifying the product size and he oversize and recirculating the oversize back to the mill for re-grinding.  This is also located at the same site in Ecuador.   
A Eimco 12 B Mucker, is featured in this photo, previously identified as a "Ore Car". The Eimco mucker was a ingenious invention, operated by compressed air, that simulated mechanically the shoveling motion of a human. It would lift the broken ore and throw it backward, into the car, just like the miners did with their shovels. It had a air motor, and ran on light rails, so it moved forward as the ore was removed. This increased production from underground hard rock mines (especially gold) in the early part of the 20th century.

For narrow vein stoper mining, these old Eimco 12B Muckers (the smallest made) are still popular, and some local companies rebuild them for sale. Stoper mining is still the most economical method to mine a narrow vein of gold, even though much research has been made on equipment to do this type of mining. Using a Eimco 12B mucker, in a 5 foot wide by 7 foot high tunnel, approximately 5 tons per 8 hour shift per man can be achieved, stoper mining. This compares to about one ton per man per shift without a mechanical mucker. They will operate in a mine tunnel that is only 5 feet wide and 7 feet high.

Eimco made a full size range of muckers, which went out of fashion with the newer loading and hauling equipment, such as the load haul dump (LHD's) machines, bucket loaders (muckers), and articulated underground tractors for hauling ore underground. As for the ore car photo that the old caption was supposed to have been matched with, it apparently never made it to the web site.

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