Word: graded
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Dates: during 1940-1949
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...abundant manganese deposits, but nearly all of them are low-grade and many of them contain the mineral in the wrong form for easy separation: manganese dioxide. But two new processes developed by the U.S. Bureau of Mines are on the point of making low-grade manganese oxide ore a useful citizen of steel metallurgy. Last week in three new pilot plants at Boulder City, Nev., where oxide ore beds adjoin Boulder Dam's cheap electricity, manganese's first citizenship papers were being signed...
...manganese carbonate ores, such as Montana's, assay a mere 20-27% (as against 50% for imported ores), but they are easy enough to concentrate by methods developed soon after World War I. But low-grade oxide ores, like Nevada's, evaded all ordinary flotation methods until the Bureau of Mines men hit on a new scheme: flotation in reverse with a new solvent...
Bureau of Mines officials last week felt that their new reverse flotation and electrolytic processes promised to remove manganese from the list of U.S. wartime worries. But, they observed, only months of pilot plant operations will show whether low-grade U.S. manganese ores can compete in a peaceful, free-trading world with foreign ores which need neither concentrating nor refining...
Twice within five minutes, as the result of Funster fumbles, the favorites found themselves within three or four yards of pay dirt, but failed to make the grade each time...
...some of the film's minor business are artfully done. If Director Mitchell Leisen and Producer Arthur Hornblow Jr. had been content to strip the picture of its elaborate frills (e.g., a prolonged cops-&-robbers chase, a native festival) and tell it simply, it might have been Grade...