Information Circular, Issues 6570-6599

airways Allis-Chalmers apparatus assay average Ayvazoglou ball mill Bituminous Coke borehole bucket bucket elevator Bureau of Mines cable cars cells cent chute clamp classifier cleaner coal conveyor belt copper cost crusher cubic Dealer deep-hole DEPARTMENT OF COMMERCE deposits depth determining diameter discharge Distributor district Dolomite Dorr dredge drilling driven electrical elevator engineer equipment excavation explosion feet ferrovanadium Figure flotation foot Fuel oil Gasoline Geological geophysical German gravity Hardinge haulage hoist holes inch INFORMATION CIRCULAR inspection installed Kerosene labor lead limestone loading machine magnetic material mesh metal method mill minerals month operated orebodies Overflow petroleum pipe plant prospecting pulp pump pyrite rock rock-dust roof rougher samples SCOTT TURNER screen seismic seismograph shaft sodium sphalerite steel stopes storage sump surface Table tailing timber tion torsion balance Total trolley wire trommel tunnel U. S. Bureau undersize unit vanadium zinc concentrate