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Jan 1, 1940

By C. Bohdanowicz

The most important decline in drilling activities during the past three years was in the Boryslaw-Tustanowice-Mraznica fields and at Bitkow in Eastern Poland. A small drilling increase in some fields of the Jaslo and Drohobycz districts, notably Wankowa, Ropienka and Rypne, cannot compensate in new production for the decline in the large fields.

Jan 1, 1934

By Fred N. Kissell, Maurice Deul

When coal is broken during mining, some of the methane trapped in the coal is released. Some recent investigations by the U.S. Bureau of Mines have shown that this methane released by breakage is only a small proportion of the total methane emission into the working section.

Jan 1, 1975

Jan 1, 1931

E. O?C. Acker Jinzoc Adachi Truman H. Aldrich Walter H. Aldridge Anson W. Allen John H. Allen William R. Appleby W. Lawrence Austin W. S. Ayres David Baker John Henry Banks Henry C. Banon Alonzo F. Bardwell Walter A. Barrows H.C. Bellinger Wm de L. Benedict Robert Bentley John F. Berry Andrew A Blair George D. Blood Charles A. Bohn Walter M. Brodie Elwin F. Brown Fredrick Burbidge H.H. Burden Charles Butters

Jan 1, 1943

By R. Roberge, H. Herman

Jan 1, 1969

By Ernest L. Bohnet

Jan 1, 1985

Jan 1, 1940

Jan 1, 1943

By Robert E. Delavault, Harry V. Warren

IN the worldwide search of buried orebodies and for entirely new areas of mineralization, geo-chemistry is taking on an increasingly important role. Indeed, geochemistry itself is splitting into various specialties-hydrogeochemistry, pedogeo-chemistry, and biogeochemistry. This article primarily relates to developments in these fields in British Columbia, but many of the remarks are applicable to the whole continent.

Jan 10, 1953

Redetermination of the Chromium and Nickel Solvuses in the Chromium-Nickel System by C. J. Bechtold and H. C. Vacher, p. 14 The text of pages 16 and 17 is in improper sequence. The correct version will appear in the bound volume.

Jan 1, 1962

Jan 1, 1939

By T. B. Counselman

Continuous countercurrent decantation calculations have always been a headache to the cyanide man (and the chemical engineer) because of the simultaneous equations involved. These are tedious to solve, and there is considerable opportunity for mathematical error. This paper presents a shortcut method for making these calculations, which has been in successful use for twenty years by the author, and which is particularly valuable in selecting the best of several possible flowsheets, or evaluating the effect of various assumptions.

Jan 2, 1950

Jan 1, 1947

By G. F. Bolling

HE high mobility of grain boundaries in zone-refined metals has been particularly demonstrated for lead above 150°C in grain growth studies1 and in the extensive work by Aust and Rutter.1 In these investigations, no elaborate precautions were taken to eliminate oxygen from the zone-refined lead; however the alteration of creep characteristics by oxygen concentrations of less than 5 x 10 -5 wt pet

Jan 1, 1962

Mining Methods LUCIEN EATON, Chairman GERALD F. SHERMAN, Vice-chairman CHARLES W. WRIGHT, Secretary Alluvial Mining CLINTON BERNARD CHARLES H. MUNRO CHARLES JANE N H. R. NORSWORTHY Open-cut Mining Iron MAX H. BARBER J. A. MacKILLICAN Copper MICHAEL CURLEY H. B. TEMPEST Underground Mining Iron C. H. BAXTER CARL BREWER TENNEY C. DESOLLAR Copper W. B. DALY A. H. WOHLRAB R. W. THOMAS

Jan 1, 1934

By Vernon E. Swanson, Tom G. Ging

Experiments indicate that simple addition of water to mixtures of untreated trona and otherwise insoluble leonardite yields a rich, black, slightly alkaline solution of concentrated humic substances. Prices of both trona from Wyoming and leonardite from South Dakota and Wyoming are very similar-$10-30 per ton. Leonardite is the term commonly given to naturally weathered, oxidized coal that is readily soluble in slightly alkaline water.1 Several tens of thousands of

Jan 1, 1973

By Guy R. Johnson

It is now generally acknowledged that the successful management of a modern foundry necessarily embraces a knowledge of chemistry, and especially a thorough acquaintance with the effect of the various metalloids on cast-iron, in order to

Jan 1, 1897

By J. L. Lytton, T. E. Tietz

UNALLOYED arc-cast molybdenum sheet is typically supplied in the cold-rolled and stress-relieved condition, hereinafter denoted CRSR. Such processing eliminates the yield-point phe-

Jan 1, 1964