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Joseph Howard McCarthy

Publications and source records attributed to Joseph Howard McCarthy.

4 recordsLinked to original sources
USGS1969

Mercury in soil gas and air--A potential tool in mineral exploration

The mercury content in soil gas and in the atmosphere was measured in several mining districts to test the possibility that the mercury content in the atmosphere is higher over ore deposits than over barren ground. At Cortez, Nev., the distribution of anorhalous amounts of mercury in the air collected at ground level (soil gas) correlates well with the distribution of gold-bearing rocks that are covered by as much as 100 feet of gravel. The mercury content in the atmosphere collected at an altitude of 200 feet by an aircraft was 20 times background over a mercury posit and 10 times background over two porphyry copper deposits. Measurement of mercury in soil gas and air may prove to be a valuable exploration tool.

Circular↗
USGS1965

Density comparison method for the measurement of isotopic variations in prepared waters

The falling-drop method of density determination has been modified so that the densities of a standard and a sample water are compared simultaneously. A constant temperature bath that does not vary more than 0.0001°C and an accurate double micropipet are described. The method has sufficient sensitivity and precision to distinguish waters that differ in specific gravity by 0.025 micrograms per ml. The method could be applied to the measurement of small variations in the isotopic composition of prepared waters.

Open-File Report↗
USGS1964

Distribution of mercury, silver, tellurium, arsenic, and antimony in the Rowe Canyon area, White Pine County, Nevada

The accompanying geochemical maps are based in part on data published in U.S. Geological Survey Professional Paper 450-E, Article 180 (Brokaw and others, 1963), and in part on new data acquired since the publication of Professional Paper 450-E. The mercury was determined by atomic absorption techniques, as described by Vaughn and McCarthy (1964), the silver by standard emission spectrographic techniques, and the tellurium, arsenic, and antimony by wet chemical methods.

Nevada↗