Cleveland County herald., 1920-11-04

mills were small aS compared witt present-day standards and the ores were relatively high grade The ore treatment problem was simple one. and as a result the technical as we'll as the executive direction of the ore dressing plant could he and was incl dental to the direction with which the licnncentrator was built.
 "fhe services of a specialist in con centratiOn were considered unneees. sary. With the development of the large, low-grade, disseminated copper deposits, the importance of ore dress Ing took sudden jump. These depog It's contain only from twenty 10 fort pounds of copper per ton of ore. The ore bodies as originally discovered con tained from 20000,0O0 to 100000 0o0 tons each of such ore For economical working of such deposits elaborate concentrating plants, capable of han ding from 5000 to 10000 tons of ore | per day were necessary.
 Skllful Work for Profit.
 "These plants required the most | skillful direction possible if a profit was to be made from their operation and q demand for specialists in con centration immediately arose. Within ] the last seven years the successful ap- l plication of processes of frOth flotation to the treatment of these l0w-grade ores has resulted in the saving of four to six pounds more copper per ton than was formerly possible.
 "The advent of Notation called for mill man of much broader scientif, education than the old concentration processes required. A Notation mill | man needs a working knowledge of the newest branch of physical chemis- try, viz, colloid chemistry, and should also have some acquaintance with or ganic chemistry. Coincident with the advent of Notation in milling there has been a revolution In the methods of grinding ores preparatory to coneen- tration. In the old concentration processes it was impossible to treat very finely ground ore economically.
 Hence all grinding was done with the end in view of producing as little slime as possible. Flotation, however. works best on firely pulverized ore. Hence it was necessary, on the intro duction of Notation, to devise methods of grinding different from those at that time in use, such methods being aimed at producing slime. This resulted in the introduction of grinding machinery of an entirely different type. In con- nection with the new grinding and flo tation machinery there was necessarily developed also machinery for sizing Snd dewatering the finely ground prod uct
 s'The men who will successfully handle this work must understand the physical principles underlying the op- erations of ore concentration, and must have, in addition, the collateral engineering knowledge essential to the designing of structures and the install lation of machinery, sufficient grasp of the principles of economics and busi- ness to be able to judge results from commercial standpoint sufficient knowledge of mining to understand iACH o4 ~sn dlC pIoQlNGl lO lilt SuiidCc of the ground, and, finally, sufficient knowledge of metallurgy to understand the demands of the metallurgist as to the character of concentrate produced
 'eTbe instruction of such men in col lege then should consist in a founda- t10n of the fundamental sciences and firm grounding in the use of the Eng 1ie.b 1or fo +a present results and conclusions; in other words, such basic instruction as is essential to the training of all engi- neers.
 "On this foundation should be built a superstructure composed of courses leading to a thorough knowledge of the properties and occurrences of min erals. to an understanding of the prin- ciples and simpler details of the design or structures te generation and trans mission of power, the methods of min ing, the general principles of metal lurgy and the principles of economics and business finance and accounting.
 Finally, following some elementary instruction in ore dressing the stu dent should be assigned a definite, fairly difficult problem in that subject, which he Is expected to carry through to a conclusion largely by his own eff forts and initioti1e.--
 Parmesan Puffs.
 Take one-haif cupful of grated Par, mesan cheese, two-thirds of cupful of bread crumbs one-half teaspoonful of salt and few dashes of cayenne; put all this mixture into a mortar and pound until well blended. Beat two