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Page 1047, results 26151 - 26175

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Geology and porphyry copper-type alteration-mineralization of igneous rocks at the Christmas Mine, Gila County, Arizona
Randolph A. Koski
1979, Open-File Report 79-844
The Christmas copper deposit, located in southern Gila County, Arizona, is part of the major porphyry copper province of southwestern North America. Although Christmas is known for skarn deposits in Paleozoic carbonate rocks, ore-grade porphyry-type copper mineralization also occurs in a composite granodioritic intrusive complex and adjacent mafic volcanic country...
Hydrologic data from selected wells in the Helena Valley, Lewis and Clark County, Montana
Joe A. Moreland, R. B. Leonard, T.E. Reed, R.O. Clausen, W.A. Wood
1979, Open-File Report 79-1676
Hydrologic data were collected during 1978-79 to aid in evaluating the hydrologic conditions in shallow aquifers beneath the Helena Valley, Montana. The locations of 52 shallow test wells augered during the study are shown on a map at a scale of 1:48,000. Periodic water-level measurements and water-quality analyses for the...
Physical characteristics of suspended sediments, South Texas Continental Shelf
Gerald L. Shideler
1979, Open-File Report 79-362
This report presents the results of a three-year study of suspended sediments within the South Texas OCS region. The investigations were a part of the environmental studies of the South Texas Outer Continental shelf sponsored by the Bureau of Land Management. The physical properties of the suspended particulate system studied...
Regional flood-frequency relations for west-central Florida
M.A. Seijo, R.F. Giovannelli, J. F. Turner
1979, Open-File Report 79-1293
This report presents regional relations for estimating the magnitude and frequency of floods on streams in west-central Florida. Flood prediction equations derived cover 20, 5-, 25-, 100-, 200-, and 500-year recurrence intervals. Annual floods for three geographic areas of west-central Florida were found to relate significantly to basin characteristics. Basin...
Sulfate geothermometry of thermal waters in the western United States
Nancy L. Nehring, Robert H. Mariner, Lloyd D. White, Mark A. Huebner, E.D. Roberts, Karen Harmon, P.A. Bowen, Lane Tanner
1979, Open-File Report 79-1135
Sulfate geothermometry recently gained acceptance as a geothermal exploration tool when it was adopted as one of the geothermometers in the Assessment of Geothermal Resources of the United States-1978 (Muffler 1979). Over 120 samples, 75 of which are from Known Geothermal Resource Areas, were used in the assessment. Data required...