At four sites in Idaho, frequency was measured separately with three different-sized plots (10 x 25, 15 x 33.5, and 20 x 50 cm) arranged in a nested configuration. These individual frequency values were added together to create a summed “frequency.” This summed value was compared to the original frequency values generated by each individual plot size in respect to its ability to detect range trend. The summation procedure consistently detected smaller changes in frequency than any individual plot size. In addition, the summed values detected a significant change in more species at each site. Summing the frequency values usually detected changes at a lower alpha level than did any single plot (0.10 vs. 0.20).
","language":"English","publisher":"Brigham Young University","usgsCitation":"Smith, S.D., Bunting, S.C., and Hironaka, M., 1987, Evaluation of the improvement in sensitivity of nested frequency plots to vegetational change by summation: Western North American Naturalist, v. 47, no. 2, p. 299-307.","startPage":"299","endPage":"307","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":298360,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":298359,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://ojs.lib.byu.edu/spc/index.php/wnan/article/view/28964"}],"country":"United States","state":"Idaho","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -117.04833984375001,\n 41.983994270935625\n ],\n [\n -117.04833984375001,\n 48.980216985374994\n ],\n [\n -111.005859375,\n 48.980216985374994\n ],\n [\n -111.005859375,\n 41.983994270935625\n ],\n [\n -117.04833984375001,\n 41.983994270935625\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"47","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"54fec431e4b02419550debbd","contributors":{"authors":[{"text":"Smith, Stuart D.","contributorId":139600,"corporation":false,"usgs":false,"family":"Smith","given":"Stuart","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":542001,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bunting, Stephen C.","contributorId":106581,"corporation":false,"usgs":true,"family":"Bunting","given":"Stephen","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":542002,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hironaka, M.","contributorId":139601,"corporation":false,"usgs":false,"family":"Hironaka","given":"M.","email":"","affiliations":[],"preferred":false,"id":542003,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70015128,"text":"70015128 - 1987 - Geochemical studies in the Indian Pass and Picacho Peak Bureau of Land Management Wilderness study areas, imperial county, Southern California","interactions":[],"lastModifiedDate":"2024-04-17T23:49:21.153402","indexId":"70015128","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2302,"text":"Journal of Geochemical Exploration","active":true,"publicationSubtype":{"id":10}},"title":"Geochemical studies in the Indian Pass and Picacho Peak Bureau of Land Management Wilderness study areas, imperial county, Southern California","docAbstract":"The U.S. Geological Survey has conducted geochemical studies in the Indian Pass (CDCA-355), 124 km2, and Picacho Peak (CDCA-355A), 23 km2, Wilderness Study Areas (WSA's) as part of a program to evaluate the mineral resource potential of designated areas in the California Desert Conservation Area. These two WSA's are of particular interest because they lie within a region which has intermittently produced significant quantities of Au since the mid-1800's, and is currently the site of much exploration activity for additional Au resources. Within a 15-km radius of the WSA's, there is one actively producing gold mine, a major deposit which began production in 1986, and one recently announced discovery. In the reconnaissance geochemical surveys of the two WSA's - 177 μm (-80 mesh) stream sediments, heavy-mineral concentrates from stream sediments, and rocks were prepared and analyzed.
Four areas of possible exploration interest were identified within the WSA's. The first area is characterized by anomalous W and Bi in nonmagnetic heavy-mineral concentrates, and is underlain primarily by the Mesozoic Orocopia Schist which has been intruded by monzogranite of Oligocene age. Alteration and mineralization appear to be localized near the intrusive contact. The mineralized rock at the surface contains secondary Cu and Fe minerals where the monzogranite intrudes the metabasite horizons of the Orocopia Schist and scheelite where the monzogranite intrudes marble within the Orocopia Schist.
","language":"English","publisher":"Elsevier","doi":"10.1016/0375-6742(87)90064-1","issn":"03756742","usgsCitation":"Smith, D.B., Berger, B.R., and Tosdal, R., 1987, Geochemical studies in the Indian Pass and Picacho Peak Bureau of Land Management Wilderness study areas, imperial county, Southern California: Journal of Geochemical Exploration, v. 28, no. 1-3, p. 479-494, https://doi.org/10.1016/0375-6742(87)90064-1.","productDescription":"16 p.","startPage":"479","endPage":"494","numberOfPages":"16","costCenters":[],"links":[{"id":224351,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"28","issue":"1-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a16ace4b0c8380cd5521a","contributors":{"authors":[{"text":"Smith, D. B. davidsmith@usgs.gov","contributorId":12840,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"B.","affiliations":[],"preferred":false,"id":370147,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Berger, B. R.","contributorId":77914,"corporation":false,"usgs":true,"family":"Berger","given":"B.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":370149,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Tosdal, R. M.","contributorId":54982,"corporation":false,"usgs":true,"family":"Tosdal","given":"R. M.","affiliations":[],"preferred":false,"id":370148,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":5222560,"text":"5222560 - 1986 - Bow-pole perch for raptors","interactions":[],"lastModifiedDate":"2012-02-02T00:15:34","indexId":"5222560","displayToPublicDate":"2010-06-16T12:19:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1882,"text":"Hawk Chalk","active":true,"publicationSubtype":{"id":10}},"title":"Bow-pole perch for raptors","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hawk Chalk","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Ellis, D.H., and Smith, D., 1986, Bow-pole perch for raptors: Hawk Chalk, v. 25, no. 3, p. 42-44.","productDescription":"42-44","startPage":"42","endPage":"44","numberOfPages":"3","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":201519,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"25","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a0ce4b07f02db5fcdc7","contributors":{"authors":[{"text":"Ellis, D. H.","contributorId":79830,"corporation":false,"usgs":true,"family":"Ellis","given":"D.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":336515,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D.G.","contributorId":49393,"corporation":false,"usgs":true,"family":"Smith","given":"D.G.","email":"","affiliations":[],"preferred":false,"id":336514,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5222213,"text":"5222213 - 1986 - An overview of raptor conservation in Latin America","interactions":[],"lastModifiedDate":"2012-02-02T00:15:10","indexId":"5222213","displayToPublicDate":"2010-06-16T12:19:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1057,"text":"Birds of Prey Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"An overview of raptor conservation in Latin America","docAbstract":"Prior to the last decade, biological studies of raptorial birds in Latin America were almost nonexistent. For many species little more was known than their general range and habitat type. The last few years have seen the opening of a door to what will surely be a flood of scientific investigations. Ultimately, the survival of raptor communities in Latin America depends not only on research but also on several other equally significant conservation efforts. These typically appear in the following order: first, appropriate legislation must be enacted and enforced to provide legal protection; second, the public must be educated concerning the value of wildlife; third, substantial blocks of favourable habitat must be identified and preserved; fourth, economic incentives must be generated so that the local human populations actually benefit from the preservation of vulnerable wildlife and natural habitats; and finally, the long-term success of all of these efforts in each nation depends on the attainment of political, economic and social stability.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Birds of Prey Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Ellis, D.H., and Smith, D., 1986, An overview of raptor conservation in Latin America: Birds of Prey Bulletin, v. 3, p. 21-25.","productDescription":"21-25","startPage":"21","endPage":"25","numberOfPages":"5","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":196208,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad5e4b07f02db68395e","contributors":{"authors":[{"text":"Ellis, D. H.","contributorId":79830,"corporation":false,"usgs":true,"family":"Ellis","given":"D.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":335827,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D.G.","contributorId":49393,"corporation":false,"usgs":true,"family":"Smith","given":"D.G.","email":"","affiliations":[],"preferred":false,"id":335826,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":11944,"text":"ofr86199 - 1986 - Analytical results and sample locality maps of stream-sediment, heavy-mineral-concentrate, and rock samples from the Kofa National Wildlife Refuge, Yuma and La Paz Counties, Arizona","interactions":[],"lastModifiedDate":"2012-02-02T00:06:44","indexId":"ofr86199","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"86-199","title":"Analytical results and sample locality maps of stream-sediment, heavy-mineral-concentrate, and rock samples from the Kofa National Wildlife Refuge, Yuma and La Paz Counties, Arizona","language":"ENGLISH","publisher":"U.S. Geological Survey,","doi":"10.3133/ofr86199","usgsCitation":"Adrian, B.M., Smith, D.B., Hill, R.T., Roemer, T.A., Vaughn, R.B., and Delaney, T.A., 1986, Analytical results and sample locality maps of stream-sediment, heavy-mineral-concentrate, and rock samples from the Kofa National Wildlife Refuge, Yuma and La Paz Counties, Arizona: U.S. Geological Survey Open-File Report 86-199, 122 p. :maps ;28 cm., https://doi.org/10.3133/ofr86199.","productDescription":"122 p. :maps ;28 cm.","costCenters":[],"links":[{"id":145432,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1986/0199/report-thumb.jpg"},{"id":39931,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1986/0199/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":39932,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1986/0199/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":39933,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1986/0199/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4acbe4b07f02db67e2a0","contributors":{"authors":[{"text":"Adrian, B. M.","contributorId":71535,"corporation":false,"usgs":true,"family":"Adrian","given":"B.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":164337,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D. B. davidsmith@usgs.gov","contributorId":12840,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"B.","affiliations":[],"preferred":false,"id":164334,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hill, R. T.","contributorId":69990,"corporation":false,"usgs":true,"family":"Hill","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":164336,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Roemer, T. A.","contributorId":72784,"corporation":false,"usgs":true,"family":"Roemer","given":"T.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":164338,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Vaughn, R. B.","contributorId":27043,"corporation":false,"usgs":true,"family":"Vaughn","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":164335,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Delaney, T. A.","contributorId":12049,"corporation":false,"usgs":true,"family":"Delaney","given":"T.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":164333,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":12457,"text":"ofr86280 - 1986 - Nonlinear least-squares inversion of frequency-domain induced polarization data (Program NLSIP)","interactions":[],"lastModifiedDate":"2012-02-02T00:06:33","indexId":"ofr86280","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"86-280","title":"Nonlinear least-squares inversion of frequency-domain induced polarization data (Program NLSIP)","language":"ENGLISH","publisher":"U.S. Geological Survey,","doi":"10.3133/ofr86280","usgsCitation":"Anderson, W., and Smith, B.D., 1986, Nonlinear least-squares inversion of frequency-domain induced polarization data (Program NLSIP): U.S. Geological Survey Open-File Report 86-280, 33 p. :ill. ;28 cm., https://doi.org/10.3133/ofr86280.","productDescription":"33 p. :ill. ;28 cm.","costCenters":[],"links":[{"id":145065,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1986/0280/report-thumb.jpg"},{"id":40714,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1986/0280/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afde4b07f02db69705a","contributors":{"authors":[{"text":"Anderson, W.L.","contributorId":54584,"corporation":false,"usgs":true,"family":"Anderson","given":"W.L.","email":"","affiliations":[],"preferred":false,"id":166168,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, B. D.","contributorId":71123,"corporation":false,"usgs":true,"family":"Smith","given":"B.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":166169,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5222044,"text":"5222044 - 1985 - Habitat comparisons and productivity in nesting common terns on the mid-Atlantic coast","interactions":[],"lastModifiedDate":"2023-11-20T12:32:38.810099","indexId":"5222044","displayToPublicDate":"2010-06-16T12:19:32","publicationYear":"1985","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1272,"text":"Colonial Waterbirds","printIssn":"07386028","active":false,"publicationSubtype":{"id":10}},"title":"Habitat comparisons and productivity in nesting common terns on the mid-Atlantic coast","docAbstract":"Nesting Common Terns (Sterna hirundo) were studied at a number of barrier beaches and small islands of tidal salt marsh in New Jersey and the Eastern Shore of Maryland-Virginina from 1980 through 1982. Data were collected on clutch sizes, nest spacing, and nesting success. The principal null hypothesis tested was that no difference in reproductive success exists between beach and marsh habitats. Nests were monitored from egg-laying in mid-May until mid-July when young fledged. Clutch sizes varied among colonies and across years but no systematic effect of year, habitat, or colony size on mean clutch size per colony was detected. Analyses of nest productivity (estimated using both the Mayfield method and using a colony average) failed to reveal significant effects of habitat or colony size but showed a stronger year effect. Storm tide flooding and egg chick disappearance (presumably predation by Herring Gulls Larus argentatus and Laughing Gulls L. atricilla nesting nearby) accounted for most nest failures. Losses due to both these mortality factors were unpredictable from year to year. Nest spacing in salt marsh colonies was much closer than it was on barrier beaches. In mixed-species colonies with Black Skimmers (Rynchops niger), distances between tern and skimmer nests were also much smaller in marsh colonies than they were on beaches. The limited amount of wrack (windrows of dead, matted vegetation) preferred by marsh-nesting terns probably explains these spacing differences. Several lines of evidence suggest that terns prefer beaches to marshes for nesting, however, the uncertainty of predation and flooding may often obscure any intrinsic differences in habitat quality. Long-term field studies are essential for testing hypotheses related to differential fitness of individuals among habitats.","language":"English","publisher":"Waterbird Society","doi":"10.2307/1521066","usgsCitation":"Erwin, R., and Smith, D.C., 1985, Habitat comparisons and productivity in nesting common terns on the mid-Atlantic coast: Colonial Waterbirds, v. 8, no. 2, p. 155-165, https://doi.org/10.2307/1521066.","productDescription":"11 p.","startPage":"155","endPage":"165","numberOfPages":"11","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":198321,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"8","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a80e4b07f02db649681","contributors":{"authors":[{"text":"Erwin, R.M.","contributorId":57396,"corporation":false,"usgs":true,"family":"Erwin","given":"R.M.","email":"","affiliations":[],"preferred":false,"id":335352,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D. C. davidsmith@usgs.gov","contributorId":31057,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"C.","affiliations":[],"preferred":false,"id":335351,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":58368,"text":"mf1389C - 1985 - Geochemical map of the Dinkey Lakes Roadless Area, Fresno County, California","interactions":[],"lastModifiedDate":"2012-02-10T00:10:27","indexId":"mf1389C","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1985","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1389","chapter":"C","title":"Geochemical map of the Dinkey Lakes Roadless Area, Fresno County, California","language":"ENGLISH","doi":"10.3133/mf1389C","usgsCitation":"Smith, D.B., Adrian, B.M., Vaughn, R.B., and McDougal, C.M., 1985, Geochemical map of the Dinkey Lakes Roadless Area, Fresno County, California: U.S. Geological Survey Miscellaneous Field Studies Map 1389, 1 map ;74 x 47 cm., on sheet 89 x 86 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1389C.","productDescription":"1 map ;74 x 47 cm., on sheet 89 x 86 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105814,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_7106.htm","linkFileType":{"id":5,"text":"html"},"description":"7106"},{"id":182869,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"62500","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -119.16666666666667,37 ], [ -119.16666666666667,37.416666666666664 ], [ -118.83333333333333,37.416666666666664 ], [ -118.83333333333333,37 ], [ -119.16666666666667,37 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b23e4b07f02db6ae20c","contributors":{"authors":[{"text":"Smith, D. 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B. davidsmith@usgs.gov","contributorId":12840,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"B.","affiliations":[],"preferred":false,"id":265997,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kuizon, Lucia","contributorId":55054,"corporation":false,"usgs":true,"family":"Kuizon","given":"Lucia","email":"","affiliations":[],"preferred":false,"id":265998,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hale, W.N.","contributorId":65161,"corporation":false,"usgs":true,"family":"Hale","given":"W.N.","email":"","affiliations":[],"preferred":false,"id":265999,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70013061,"text":"70013061 - 1985 - Electrical geophysical investigations of massive sulfide deposits and their host rocks, West Shasta copper-zinc district","interactions":[],"lastModifiedDate":"2024-01-08T18:28:43.380103","indexId":"70013061","displayToPublicDate":"1985-01-01T00:00:00","publicationYear":"1985","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"Electrical geophysical investigations of massive sulfide deposits and their host rocks, West Shasta copper-zinc district","docAbstract":"The West Shasta copper-zinc district, Shasta County, California, contains many volcanogenic sulfide deposits within Middle Devonian rhyolites that have not been highly metamorphosed. The district was selected by the U.S. Geological Survey for intensive geological, geochemical, and geophysical study under the Development of Assessment Techniques (DAT) project because accessible exposures have been created by erosion and mining. This report describes the geophysical methods applied to characterize the electrical properties of selected West Shasta massive sulfide deposits and their host rocks, at both small (less than 25 ft) and large (greater than 25 ft) scales. The electrical techniques used galvanic (spectral induced polarization--SIP) and induction (very low frequency--VLF, slingram, and time domain electro-magnetics--TDEM) methods.In situ spectral induced polarization measurements were carried out to determine whether or not conductive anomalies in the district could be differentiated by their polarization signatures. The sulfide, in situ, induced polarization-phase spectral signatures (the induced polarization effect as a function of frequency) have much less character and lack the distinctive shape reported for other massive sulfide deposits; however, they do have some identifiable massive sulfide traits, such as low resistivity and variable polarizability. The nondescript sulfide spectral signature is attributed to the poor development of polarization processes due to a high percentage of resistive, nonpolarizable gangue minerals, lack of pore space, and limited electrolytic fluids. Large-scale spectral induced polarization measurements over the Hornet orebody have a greater polarization than the in situ measurements. This observation, in addition to the fact that much of the Hornet sulfide body has been removed by previous mining activity, suggests that the dominant polarization processes occur at the ground-water-sulfide interface.Combined use of induction techniques, which have different depths of penetration, were used to locate conductive anomalies and determine their shape and depth. All the induction surveys over the Hornet orebody detected the conductive tabular-shaped massive pyritic sulfide deposit hosted in resistive rhyolite. Shallow penetrating induction methods near the Keystone mine detected a conductive fault zone where a block of shale has been downfaulted into volcanic rock. Integrated interpretation of deeper penetrating induction data over this conductive fault zone indicates that parts of the shale are also conductive, demonstrating that the integrated use of several induction methods provides better conductor definition than a single method.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.80.8.2213","issn":"03610128","usgsCitation":"Horton, R.J., Smith, B.D., and Washburne, J., 1985, Electrical geophysical investigations of massive sulfide deposits and their host rocks, West Shasta copper-zinc district: Economic Geology, v. 80, no. 8, p. 2213-2229, https://doi.org/10.2113/gsecongeo.80.8.2213.","productDescription":"17 p.","startPage":"2213","endPage":"2229","numberOfPages":"17","costCenters":[],"links":[{"id":220344,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"80","issue":"8","noUsgsAuthors":false,"publicationDate":"1985-12-01","publicationStatus":"PW","scienceBaseUri":"505a0890e4b0c8380cd51b8b","contributors":{"authors":[{"text":"Horton, R. J.","contributorId":19926,"corporation":false,"usgs":true,"family":"Horton","given":"R.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":365197,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, B. D.","contributorId":71123,"corporation":false,"usgs":true,"family":"Smith","given":"B.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":365198,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Washburne, J.C.","contributorId":105431,"corporation":false,"usgs":true,"family":"Washburne","given":"J.C.","affiliations":[],"preferred":false,"id":365199,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":9444,"text":"ofr84795 - 1984 - Geophysical surveys at the Getchell and Preble disseminated gold deposits, Humboldt County, Nevada","interactions":[],"lastModifiedDate":"2012-02-02T00:06:12","indexId":"ofr84795","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"84-795","title":"Geophysical surveys at the Getchell and Preble disseminated gold deposits, Humboldt County, Nevada","language":"ENGLISH","publisher":"U.S. Geological Survey,","doi":"10.3133/ofr84795","usgsCitation":"Heran, W., and Smith, B.D., 1984, Geophysical surveys at the Getchell and Preble disseminated gold deposits, Humboldt County, Nevada: U.S. Geological Survey Open-File Report 84-795, 79 p. :ill. (one folded), map ;28 cm., https://doi.org/10.3133/ofr84795.","productDescription":"79 p. :ill. (one folded), map ;28 cm.","costCenters":[],"links":[{"id":142203,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1984/0795/report-thumb.jpg"},{"id":37154,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1984/0795/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac7e4b07f02db67b409","contributors":{"authors":[{"text":"Heran, W. D.","contributorId":19147,"corporation":false,"usgs":true,"family":"Heran","given":"W. D.","affiliations":[],"preferred":false,"id":159695,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, B. D.","contributorId":71123,"corporation":false,"usgs":true,"family":"Smith","given":"B.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":159696,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":7012,"text":"ofr84662 - 1984 - Assessment of mineral resources in the Muggins Mountains Bureau of Land Management Wilderness Study Area (AZ-050-53A), Yuma County, Arizona","interactions":[],"lastModifiedDate":"2021-12-29T20:27:56.264199","indexId":"ofr84662","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"84-662","title":"Assessment of mineral resources in the Muggins Mountains Bureau of Land Management Wilderness Study Area (AZ-050-53A), Yuma County, Arizona","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr84662","usgsCitation":"Smith, D.B., Tosdal, R., Adrian, B.M., and Vaughn, R.B., 1984, Assessment of mineral resources in the Muggins Mountains Bureau of Land Management Wilderness Study Area (AZ-050-53A), Yuma County, Arizona: U.S. Geological Survey Open-File Report 84-662, ii, 34 p., https://doi.org/10.3133/ofr84662.","productDescription":"ii, 34 p.","costCenters":[],"links":[{"id":393622,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_13509.htm"},{"id":34305,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1984/0662/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139508,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1984/0662/report-thumb.jpg"}],"country":"United States","state":"Arizona","county":"Yuma County","otherGeospatial":"Muggins Mountains Bureau of Land Management Wilderness Study Area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -114.42,\n 32.683\n ],\n [\n -114.233,\n 32.683\n ],\n [\n -114.233,\n 32.778\n ],\n [\n -114.42,\n 32.778\n ],\n [\n -114.42,\n 32.683\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4abae4b07f02db671f48","contributors":{"authors":[{"text":"Smith, D. B. davidsmith@usgs.gov","contributorId":12840,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"B.","affiliations":[],"preferred":false,"id":153907,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tosdal, R. M.","contributorId":54982,"corporation":false,"usgs":true,"family":"Tosdal","given":"R. M.","affiliations":[],"preferred":false,"id":153909,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Adrian, B. M.","contributorId":71535,"corporation":false,"usgs":true,"family":"Adrian","given":"B.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":153910,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Vaughn, R. B.","contributorId":27043,"corporation":false,"usgs":true,"family":"Vaughn","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":153908,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":30828,"text":"ofr84779 - 1984 - Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Indian Pass (CDCA-355) and Picacho Peak (CDCA-355A) Wilderness Study Areas, Imperial County, California","interactions":[],"lastModifiedDate":"2022-11-03T18:33:00.549446","indexId":"ofr84779","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"84-779","title":"Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Indian Pass (CDCA-355) and Picacho Peak (CDCA-355A) Wilderness Study Areas, Imperial County, California","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr84779","usgsCitation":"Adrian, B.M., Smith, D.B., Detra, D., and Roemer, T.A., 1984, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Indian Pass (CDCA-355) and Picacho Peak (CDCA-355A) Wilderness Study Areas, Imperial County, California: U.S. Geological Survey Open-File Report 84-779, Report: 37 p.; 2 Plates: 19.67 × 24.49 inches and 19.61 × 24.31 inches, https://doi.org/10.3133/ofr84779.","productDescription":"Report: 37 p.; 2 Plates: 19.67 × 24.49 inches and 19.61 × 24.31 inches","costCenters":[],"links":[{"id":409119,"rank":5,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_13557.htm","linkFileType":{"id":5,"text":"html"}},{"id":59557,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1984/0779/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":59556,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1984/0779/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":59555,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1984/0779/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":160922,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1984/0779/report-thumb.jpg"}],"country":"United States","state":"California","county":"Imperial County","otherGeospatial":"Indian Pass and Picacho Creek Wilderness Study Areas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -114.682,\n 33.135\n ],\n [\n -114.859,\n 33.135\n ],\n [\n -114.859,\n 32.981\n ],\n [\n -114.682,\n 32.981\n ],\n [\n -114.682,\n 33.135\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4acce4b07f02db67e8d1","contributors":{"authors":[{"text":"Adrian, B. M.","contributorId":71535,"corporation":false,"usgs":true,"family":"Adrian","given":"B.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":204094,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D. B. davidsmith@usgs.gov","contributorId":12840,"corporation":false,"usgs":true,"family":"Smith","given":"D.","email":"davidsmith@usgs.gov","middleInitial":"B.","affiliations":[],"preferred":false,"id":204093,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Detra, D.E.","contributorId":72358,"corporation":false,"usgs":true,"family":"Detra","given":"D.E.","email":"","affiliations":[],"preferred":false,"id":204095,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Roemer, T. A.","contributorId":72784,"corporation":false,"usgs":true,"family":"Roemer","given":"T.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":204096,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":6993,"text":"ofr84675 - 1984 - Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, rock, and water samples from the roadless areas and the Santa Lucia Wilderness in the Los Padres National Forest, Kern, Los Angeles, San Luis Obispo, Santa Barbara, and Ventura Counties, southwestern California","interactions":[],"lastModifiedDate":"2021-11-10T22:16:26.031534","indexId":"ofr84675","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"84-675","title":"Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, rock, and water samples from the roadless areas and the Santa Lucia Wilderness in the Los Padres National Forest, Kern, Los Angeles, San Luis Obispo, Santa Barbara, and Ventura Counties, southwestern California","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr84675","usgsCitation":"Adrian, B.M., Smith, D.B., Frizzell, V.A., and Vaughn, R.B., 1984, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, rock, and water samples from the roadless areas and the Santa Lucia Wilderness in the Los Padres National Forest, Kern, Los Angeles, San Luis Obispo, Santa Barbara, and Ventura Counties, southwestern California: U.S. Geological Survey Open-File Report 84-675, Report: 82 p.; 2 Plates: 41.29 × 27.53 inches and 41.72 × 27.19 inches, https://doi.org/10.3133/ofr84675.","productDescription":"Report: 82 p.; 2 Plates: 41.29 × 27.53 inches and 41.72 × 27.19 inches","costCenters":[],"links":[{"id":391593,"rank":5,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_12911.htm"},{"id":34279,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1984/0675/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":34278,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1984/0675/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":34277,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1984/0675/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139734,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1984/0675/report-thumb.jpg"}],"country":"United States","state":"California","county":"Kern County, Los Angeles County, San Luis Obispo County, Santa Barbara County, Ventura County","otherGeospatial":"Los Padres National Forest","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -120.69580078125001,\n 34.32982832836203\n ],\n [\n -118.667,\n 34.32982832836203\n ],\n [\n -118.667,\n 35.50987173838399\n ],\n [\n -120.69580078125001,\n 35.50987173838399\n ],\n [\n -120.69580078125001,\n 34.32982832836203\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4885e4b07f02db51923e","contributors":{"authors":[{"text":"Adrian, B. 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