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At least 1,765 records · Page 98Linked to original sources
USGS1975

Geology, physical properties, and surface effects at Discus Thrower Site, Yucca Flat, Nevada test site

Geologic studies in connection with Project Discus Thrower have furnished detailed stratigraphic and structural information about northwestern Yucca Flat. The Paleozoic rocks consist of a lower carbonate sequence, argillite of the Eleana Formation, and an upper carbonate sequence. The distribution of these rocks suggests that both top and bottom of the Eleana are structural contacts, probably thrusts or reverse faults. The overlying tuff includes several units recognized in the subsurface, such as the Fraction Tuff and tuff of Redrock Valley. Other units recognized include bedded tuff associated with the Grouse Canyon Member of Belted Range Tuff, and the Rainier Mesa and Ammonia Tanks Members of the Timber Mountain Tuff. The Timber Mountain and Grouse Canyon are extensively altered to montmorillonite (a swelling clay), possibly as a result of ponding of alkaline water. The overlying alluvium locally contains at the base a clayey, tuffaceous sandstone. Geophysical logs were used as an aid in locating geologic contacts and determining in situ physical properties. Graphic logs are presented that show the correlation of lithology and geophysical logs. Many of the rock units have characteristic log responses, but alteration within rock units affects the logs strikingly in some drill holes. The most significant surface effect of the experiment was the formation of a 4-foot fault scarp northwest of the site.

Open-File Report↗
USGS1975

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller Quadrangle, Alaska

This summary of references is designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Teller quadrangle, Alaska. All references to published and open-filed reports of the Geological Survey, to most published and open-filed reports of the U.S. Bureau of Mines, and to most published reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1975, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Gedlogical and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This summary is divided into three parts: a section made up of summaries of references arranged alphabetically by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section and cited in introductory paragraphs. Pages are not numbered because users may wish to add data from other sources.

Alaska↗
USGS1975

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in West-Central Alaska (Hughes, Kotzebue, Melozitna, Selawik, Shungnak)

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in 5 quadrangles in west-central Alaska. All references to published and open-filed reports of the Geological Survey, to most published and open-filed reports of the U.S. Bureau of Mines, and to most published reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1975, are summarized. Occasionally reports from other sources have been included; in such instances references have been summarized in greater detail than those to the kinds of reports listed above. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1975

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in Northern Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in 11 quadrangles in northern Alaska. All references to published and open-filed reports of the Geological Survey, to most published and open-filed reports of the U.S. Bureau of Mines, and to most published reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1975. are summarized. Occasionally reports from other sources have been included; in such instances references have been summarized in greater detail than those to the kinds of reports listed above. Certain, mainly statistical reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1976

Heat flow near Charleston, South Carolina

As part of a study of the geology and geophysics of the Charleston, South Carolina, area, thermal conductivity, thermal gradient, and heat flow were determined in a 742 meter, continuously cored, test hole. The hole is located 41 km west-northwest of Charleston near Clubhouse Corners, Figure 1, directly over a gravity and magnetic high and the possible hypocenter of the 1889 Charleston earthquake. Drilling began January 13, 1975, and the hole penetrated 750 meters of Cenozoic and Upper Cretaceous sedimentary rocks finally bottoming in 42 meters of amygdaloidal basalts. Core recovery was 70% in sedimentary formations and 100% in the basalts. Detailed systematic studies of the core and the area surrounding the borehole were presented at the Symposium: Geology and Geophysics of Charleston, South Carolina, Area, held at the annual meeting of the Northeastern and Southeastern sections of the Geological Society of America during the week of March 25-27, 1976. Results from the thermal study are summarized in this report.

South Carolina↗
USGS1976

Geochemical prospecting for Carlin-type gold deposits

Disseminated, Carlin-type, gold deposits are associated with a volatile suite of elements consisting of Hg, As, Sb, W, and sometimes, but not always, Au. Geochemical exploration for this type of disseminated deposit depends upon recognizing the significance of this volatile suite and interpreting it in light of other geologic and geophysical data. One way of estimating the significance of the volatile suite is to determine enrichment factors. The enrichment factor is defined as abundance divided by crustal abundance or abundance divided by the local Clarke. Enrichment factors for the volatile suite in specific areas of the Edna Mountain quadrangle, Humboldt County, Nevada, interpreted with other geologic and geophysical factors, indicate that a potential for disseminated gold mineralization exists. Although most known disseminated gold deposits are exposed at the surface, the potential for finding additional buried or concealed deposits in north-central Nevada is high. Future geochemical exploration programs should be geared toward finding these buried or concealed deposits,-which may be indicated at the surface by leakage halos of the volatile suite.

Open-File Report↗
USGS1976

Test drilling for ground water in Hudspeth, Culberson, and Presidio Counties in westernmost Texas

From November 1973 to October 1974, the U.S. Geological Survey drilled four deep test holes to supplement hydrologic and geophysical studies evaluating fresh ground water in the basins of westernmost Texas. For each test, samples of drill cuttings were collect·ed, borehole geophysical logs were run, and water samples were collected from specific zones. The Leopold Guerra No. 1 test hole penetrated sand and gravel :o 1,100 feet (335m), and logs and water samples indicated fresh ground water to that depth. Below 1,100 feet (335m), the material probably has low permeability. The Clay Evans No. 1 test penetrated sand, gravel, and clay to 555 feet (169m), sand and thin volcanic flows to about 1,250 feet (381 m), and volcanic flows and tuffs to 2,006 feet (611 m). Logs and water samples indicated fresh ground \vater to about 1, 250 feet (381 m); below that, permeability is probably low. The Culberson County Airport test was drilled through sand, gravel, and clay to 1,145 feet (349m), conglomerate to 1,205 feet (367m), and the Lower Cretaceous Cox Sandstone to 1,306 feet (398m). Logs and water s~mples indicated fresh water in the alluvial fill and in the Cox Sandstone to about 1,265 feet (386m); below that depth, permeability is probably low. The Davis test was drilled through clay with some thin beds of sand and gravel containing fresh water to a depth of 2,012 feet (613 m). Borehole temperature data indicated above-nonnal gradients in the Guerra and Culberson County Airport tests. Temperature gradients in the Evans and Davis tests were near normal.

Open-File Report↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Chandalar and Wiseman quadrangles in the southern Brooks Range, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most published reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1975, are summarized. An unpublished manuscript report of the Alaska Territorial Department of Mines (Reed, 1938) is included; references to it are summarized in greater detail than those to the kinds of reports listed above. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1976, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Steelmute, and Taylor Mountains quadrangles, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Dillingham, Sleetmute, and Taylor Mountains quadrangles in southwestern Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1976, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Charley River and Coleen quadrangles, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Charley River and Coleen quadrangles in east-central Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1976, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically first by quadrangle and second by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle Quadrangle, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Circle quadrangle, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1976, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Utah↗
USGS1976

Induced-polarization surveys applied to exploration for roll-front uranium deposits

This open-file report summarizes the oral presentation given at the 45th Annual Meeting of the Society of Exploration Geophysicists. The data analysis given here is brief because of time limitations imposed at the meeting. A more detailed analysis of the data (both geological and geophysical) will be given in subsequent publications. Our oral presentation was preceded by one given by Jeffrey Daniels and James Scott entitled "Borehole Investigations of South Texas Uranium Deposits." Statements made in their presentation that are pertinent to this report are as follows: (1) a Tertiary sandstone is the host for the South Texas uranium occurrence, (2) the roll-front geometry is similar to those found in Wyoming, and (3) the roll-front does not occur at a visually obvious change from reduced to oxidized environments. A careful comparison of the IP (induced polarization) borehole logs and lithology revealed the following general points: (1) the largest IP response logged in the boreholes occurred at the uranium roll-front, and (2) the IP response can be correlated with percentage pyrite and with variations in the percentage and type of clay present. The IP measurements reported here were made with a time-domain Huntec IP receiver. The transmitted wave-form had a two-second on-and-off period. Four windows were measured during the off-time. The second window, M2, which is given here, has a window duration of 130 milliseconds from 50 to 130 milliseconds. IP coupling is inferred not to be a serious problem in the survey data reported here, because the variations in M measurements are the same as those seen for the2 window of longest delay and length. The data presented herein are part of a broad data set which the U.S. Geological Survey has gathered on surface geophysical methods. Other people who have been involved in the data collection, interpretation, and presentation are John Cady, David Campbell, Ralph Corken, Richard Meyer, Louis O'Connor, Tommas Nash, and James Scott.

Open-File Report↗
USGS1976

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Livengood quadrangle, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1976, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1977

Reconnaissance drilling in the Yampa coal field, Hayden-Williams Fork Mountains area (Yampa No. 3), Moffat and Routt counties, Colorado, during 1976

Under Contract No. 14-08-0001-15727, awarded by the U.S. Geological Survey, Jim Feighny, of Loveland, Colo., drilled 42 test holes in the Williams Fork Mountains near Hayden, Colo., in September 1976. The area is referred to in the Contract as Yampa No. 3, which includes the Bureau of Land Management's (ELM) tracts WF-10, WF-12, WF-16, and WF-17. The purpose of the drilling was to obtain information on the quality and extent of the coal in the area. All holes were logged using either Gamma-Gamma (density), Natural Gamma, Caliper, Resistivity, or spontaneous-potential (SP) geophysical logs. The logging was done by the U.S. Geological Survey, the Birdwell Division of Seismograph Service Corp., Century Geophysical, and Geodynamics, Inc. The water level is indicated in table 1 for each drill hole at the time the hole was logged. All holes were drilled on private surface, and surface ownership is shown in table 1.

Colorado↗
USGS1977

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Tanana Quadrangle, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Tanana quadrangle, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies released before January 1, 1977, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗
USGS1977

Summary of results from electromagnetic and galvanic soundings on Kilauea Iki lava lake, Hawaii

The purpose of this report is to summarize various electrical sounding studies made on the Kilauea Iki lava lake and to present some of the preliminary interpretations that resulted from the measurements. The following discussion is not intended as a complete interpretation, but is intended to summarize the major points made in an invited oral presentation at the American Geophysical Union fall meeting held in San Francisco, Calif. on December 6, 1976. This paper was part of a group of papers dealing with various geophysical studies recently made on the Kilauea Iki lava lake. A general plan map of Kilauea Iki lava lake is shown in figure 1. Electromagnetic (EM) loop-loop soundings, D.C. resistivity soundings, and VLF apparent resistivity measurements were made on the lave lake surface. All of these surveys were made to determine the geoelectric structure of the lava lake and to determine parameters of the molten basaltic lens that exist in the partially solidified lava lake.

Hawaii↗
USGS1977

Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Eagle Quadrangle, Alaska

These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Eagle quadrangle, Alaska. All references to reports of the Geological Survey, to most reports of the U.S. Bureau of Mines, and to most reports of the State of Alaska Division of Geological and Geophysical Surveys and its prececessor State and Territorial agencies released before July 1, 1977, are summarized. Certain, mainly statistical, reports such as the annual Minerals Yearbook of the U.S. Bureau of Mines and the biennial and annual reports of the State of Alaska Division of Geological and Geophysical Surveys and its predecessor State and Territorial agencies are not included. This report is divided into three parts: a section made up of summaries of references arranged alphabetically by occurrence name; a section that lists synonyms for names in the first section, claim names, and the names of operators and owners of mines and prospects; and a section that lists, by author, all references summarized in the first section.

Alaska↗