There are two classes of rock breakers machines in general use: Jaw crushers with reciprocating motion, and gyratory crushers The Blake and the Dodge crushers are representative
The gold sluices in which the gold is caught are constructed on exactly the same principles as those already described, but are larger and, though
The method of working by Hydraulic Mining consists, as has been already stated, in breaking down banks of gravel by the impact of powerful jets of
The origin of the gold in deep placers has long been a vexed question. It was formerly accepted without question that the erosion of auriferous
Both in Australia and California, besides the superficial placer deposits situated in or near the existing rivers, which in the deep canons of the Klamath
In work on shallow placer deposits by individuals the results differ greatly, both according to the strength and skill of the worker and to the
The gold deposits grouped together under the name of “ placers ” comprise sands, gravels, or any loosely coherent or non-coherent alluvial beds containing gold.
The study is not intended to be a complete geometallurgy book, but it certainly is a great example of applied geometallurgy. It was conducted on
Something that all of the various and mining techniques have in common board and pillar, stoping, caving, long wall mining; is that they take place
The Siberian Sluice and the apparatus at Voltchanka, which may be taken as a type, consists of a head sluice and three secondary sluices, which