Giant Gyratoriy Crushers

We left the big primary gyratories back among the misty memories of the first Word War. As a matter of fact, there is not a great deal more to tell so far as these machines are concerned, except for one more big jump in reached a 48-in. receiving opening by 1910 and 54-in shortly thereafter, was developed a few years later into the 60-in. size.

Our own first 60-in. machines were built in 1926-27, and these crushers-two of which were installed in a South American copper mine –set a world record in weight and proportions which still stands. These giant machines, weighing about 500 tons each, and rearing their steel frames to the height of a two-story building, are indeed a long step forward from the first tiny N° 2 Gates crusher that came out of the little shop on Randolph Street in Chicago some 60-odd years ago.

Development and Production Active stream bed sampling technique Identifying Niobium Minerals Silver Composition, Crystallization, Structure and Occurrence Health and Safety Are the Key Nitrogen & Copper-Nickel Ore Typical Ore Minerals Power Requirements of Crushers Public Mining Company Disclosure Processing Ore Cleavage, Parting and Fracture Metamorphic Rocks Porphyry Deposits Sulfides, Semimetals Sulfides and Realgar Changes in Financial Position