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By W. H. Gauvin, N. J. Themelis

Jan 1, 1963

Jan 1, 1903

By Eugene Guccione

Upholding individual rights-and abhorring power politics-a newly formed group of young professionals is developing private nongovernmental solutions to environmental problems.

Jan 4, 1976

By R. M. Rose, C. S. Tedmon, J. Wulff

It is frequently of interest to study the influence of small quantities of interstitial impurities on the properties of various refractory metals and alloys.

Jan 1, 1964

Jan 1, 1959

Jan 1, 1914

Jan 1, 1911

NORTH AMERICA Number Members Alaska 36 Canada 323 Mexico 184 Newfoundland 3 United States Alabama 40 Arizona 111 Arkansas 8 California 646 Colorado 171 Connecticut 90 Delaware 21 District of Columbia 136 Florida 16 Georgia 7 Idaho 66 Illinois 208 Indiana 66 Iowa 11 Kansas 24 Kentucky 32

Jan 1, 1934

By H. R. Joesting

Geophysical search for minerals is stepped up to meet requirements of expanded defense program - Seismic and electrical surveys become firmly established for ground-water and engineering investigations.

Jan 2, 1953

By Franklin H. Sharp

The operation of the Magmont Concentrator located on the New Lead Belt of Southeast Missouri is described. Ore characteristics affecting lead-copper-zinc separation are enumerated, and the cur- rent methods of separation are detailed.

Jan 1, 1976

By E. H. Rennhack

THE presence of sufficient quantities of the inter- stitial elements, carbon, oxygen, and nitrogen is known to decrease sienificantly the room-temperature impact resistance of titanium. Hydrogen does not appear to affect impact strength unless present

Jan 1, 1959

By E. J. Freeh, W. E. Horst

Mathematical models of a continuous comminution process are developed as an extension of the batch grinding model. Pilot-scale experimental work is described and the results are used to demonstrate the capability of the comminution models to simulate observed behavior over a relatively wide range of process variables.

Jan 1, 1973

By J. D. Miller, R. L. Atwood

The structure, properties, and composition of commercial chelating-type copper extractants are examined. Characterization of these extractants was accomplished using organic separation techniques and analytical tools such as NMR and infrared spectroscopy. Results indicate that only the trans isomer of the diphenylhydroxyoxime (LIX 64N) is capable of copper chelation. The effects of structural modification of the extractants on the extraction and stripping reactions are discussed.

Jan 1, 1974

By Mason K. Banks

A process has been developed which produces spodumene concentrates assaying 6.0 pct Li20 and 0.45 pct Fe203, with 70 to 75 pct recovery of spodumene. Two flotation separations are required: the simultaneous removal of mica, feldspar, and quartz as a froth product using a cationic collector, and the subsequent removal of iron-bearing minerals as a froth product while spodumene is depressed as a tailing.

Jan 2, 1953

By Richard L. Coleman

Metallurgical testwork to develop a flowsheet is described, beginning with background information required right through to a final process flowsheet. Both laboratory and pilot plant testing are reviewed with emphasis on the former.

Jan 1, 1978

By William G. Brissenden

Gaspe Copper Mines Ltd., a subsidiary of Noranda Mines Ltd., operates a completely integrated copper mining, milling and smelting plant at Murdochville, on the Gaspe Peninsula of Quebec. Operating six days a week, the mine produces 8000 tpd of ore. The mill runs continuously and capacity is rated at 6500 tpd of ore. Treating Gaspe concentrate output plus a certain amount of custom concentrate, the smelter produces between 3700 and 4000 tons of copper anodes per month.

Jan 9, 1959

The Committee on Nominations is as follows: Pope Yeatman, Chairman, B. B. Thayer, Henry Landes, Robert J. Grant, F. V. Desloge, Albert Burch, C. K. Leith.

Jan 6, 1919

By M. E. Gershon

Conventional methods of drill hole site selection are reviewed briefly. Two approaches using geostatistics are then discussed, both of which have been shown to yield improved results. Finally, a branch and bound algorithm is described which will select the best locations for drilling from a user specified number of possible drill sites. Two options are discussed. First, the user can specify a maximum drilling investment or a maximum number of drill holes and the program will select the locations yielding the minimum estimation variance. This amounts to getting the most for a given investment. Alternatively, a maximum tolerable estimation variance can be specified and the program will select the number and location of the drill holes to obtain the desired information at a minimum cost. Another benefit of the approach is the quantification of the tradeoffs between investment and information obtained.

Jan 1, 1985

Jan 1, 1917