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Tin, copper, and uranium at Majuba Hill, Nevada
R.H. Thurston, F.M. Chace
1950, Trace Elements Investigations 81-A
Uranium minerals occur with ores of copper, tin, and silver at Majuba Hill, Nevada. During World War I, the Majuba Hill mine produced about 4,000 tons of 12 percent copper ore, and during World War II about 23,000 tons of ore containing 2 to 4 percent copper and enough tin ore to furnish...
Reconnaissance for trace elements in North Dakota and eastern Montana. Part 1. Geology and radioactivity. Part 2. Reserves and summary
Donald G. Wyant, Ernest P. Beroni
1950, Trace Elements Investigations 61
A reconnaissance for sources of radioactive material in North Dakota and eastern Montana was made in 1948. This reconnaissance was followed by a more detailed survey of parts of Golden Valley and Slope counties, southwestern North Dakota, in June 1949. The radioactivity of representative sections of all formations known to be...
A preliminary report on the rapid fluorimetric determination of uranium in low-grade ores
F. S. Grimaldi, Harry Levine
1950, Trace Elements Investigations 47
A simple and very rapid fluorimetric procedure is described for the determination of uranium in low-grade shale and phosphate ores. The best working range is from 0.001 to about 0.04 percent U. The procedure employs batch extraction of uranium nitrate by ethyl acetate, using aluminum nitrate as the salting agent,...
An improved fluorimeter for the determination of uranium in fluoride melts
Mary H. Fletcher, Irving May
1950, Trace Elements Investigations 120
The Model R fluorimeter has been modified to increase its stability and sensitivity. The new instrument* is about ten times as sensitive as the original fluorimeter, but it can also be employed conveniently at a sensitivity level comparable to or less than that of the Model R fluorimeter. *The modified fluorimeter...
Carnotite resources in the Charles T. area and vicinity, San Miguel County, Colorado
Alfred Lerner Bush
1950, Trace Elements Investigations 112
Between November 1947 and September 1949, the United States Geological Survey, at the request of the Atomic Energy Commission, conducted an exploratory drilling program in the Charles T. area and vicinity. The purpose of the exploration was to discover new carnotite deposits to support milling operations on the Colorado Plateau,...
A preliminary report on methods of determining the age of Colorado plateau carnotite
Lorin Rollins Stieff, M.N. Girhard, T. W. Stern
1950, Trace Elements Investigations 108
Four methods of dating Colorado Plateau carnotite have been examined and evaluated: mineralogic methods, radioactive-equilibrium methods, lead-uranium-ratio methods, and lead-isotope methods. The data on 12 high-grade samples, from a suite of 50 representative carnotite ores, are presented....
The design of the Model V transmission fluorimeter
Mary H. Fletcher, Irving May, Joseph W. Anderson
1950, Trace Elements Investigations 133
The transmission fluorimeter for the measurement of the fluorescence of uranium in fluoride melts is described. The instrument incorporates several improved features which have not been published previously. Unlike the earliest models, the design of the new fluorimeter, with its close machining of parts, reduces the possibility of light leakage...
Staff report on phosphates
Vincent Ellis McKelvey, James Bachelder Cathcart
1949, Trace Elements Investigations 94-2
No abstract available....