Abstract: The scope of the semiquantitative spectrographic method for the analysis of minerals, rocks, and ores previously described as determining 55 elements, has now been increased to 68 elements which can be estimated in one exposure of a l0-mg sample. Fluorine, the 69th element, requires a separate exposure for some materials. The method has been used to complete about 185,000 determinations in the past two years. Listed in this report are 336 chemical check analyses that indicate approximately 8 percent disagreements in the magnitude of one 10 percent bracket. No chemical and spectrographic results differ by a factor of more than 10.

Abstract: For a number of years the Geological Survey has employed core drilling as a means of obtaining samples of underground formations for use in exploring and evaluating mineral deposits. During 1951, however, experiment with less expensive methods showed that, for analytical purposes, wagon-drill cuttings could be used as effectively as cores, provided a practical method were devised for recovering them in suitable form. The recent development of such a method has made it possible, in places where the depth of drilling does not exceed 125 feet, to supplant thousands of feet of core drilling by wagon drilling which is much faster and which can be done at approximately one-third the cost of the former method. This report describes the sampler and discusses performance, maintenance, and operating costs.

Report describing a wagon drill used for collecting samples of underground rock formations, as well as its performance, maintenance, and operating costs.

Report discussing the uranium-containing radioactive granite of the Miller House-Circle Hot Springs area of east-central Alaska.

Report summarizing the research done by the Geochemistry and Petrology branch of the Trace Elements Section during the period from July 1 - September 30, 1951. Research includes mineralogic and petrologic investigations of radioactive rocks, minerals, and ores, as well as investigations of chemical, spectrographic, and radiometric methods of analysis to be applied to radioactive materials such as uranium, thorium, and their compounds.

Report summarizing the research done by the Geochemistry and Petrology branch of the Trace Elements Section during the period from October 1 - December 31, 1951. Research includes mineralogic, petrologic, and geochemical investigations of radioactive rocks, minerals, and ores, as well as investigations of chemical, spectrographic, and radiometric methods of analysis to be applied to radioactive materials such as uranium, thorium, and their compounds.

A report regarding radioactive granite located in the Miller House-Circle Hot Springs area, in East-Central Alaska. This report contains work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.