Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California

Doebrich, Jeff L.; Albino, G.V.; Barker, Charles E.; Duffield, Wendell A.; Dunn, V.C.; Hanna, W. F.; McFarlan, J.P.; McGuire, D.J.; Miller, Morris; Peters, S.G.; Plouff, Donald; Raines, Gary L.; Sawatasky, D.L.; Spanski, Gregory T.

doi:10.3133/ofr94712

Cited by 2 publications

(10 citation statements)

References 11 publications

(13 reference statements)

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“…19), was obtained in digital format from a statewide compilation by Saltus (1988b) in Nevada, C.R. Roberts (written commun., 1990;Snyder and others, 1982) in California, Plouff and others (1976), and Plouff (1987bPlouff ( , 1994. To preserve the identity of original data sources, original data later were recovered from the Gravity Library of the Defense Mapping Agency (National Geophysical Data Center, 1984) and other published sources to replace all except 355 data points from Saltus (1988b).…”

Section: Contentsmentioning

confidence: 99%

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Plouff¹

1997

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The U.S. Geological Survey (USGS) is a party to joint interagency Memorandums of Understanding with the Bureau of Land Management (BLM) and the U.S. Bureau of Mines (USBM) to coordinate resource assessments and evaluations of BLM-administered lands. Resource assessments of BLM Resource Areas, which are conducted by the USGS, assist the BLM in meeting inventory and evaluation, resource-management planning, and other management requirements of the Federal Land Policy and Management Act of 1976. This report is part of a resource assessment of BLM-administered land in northwest Nevada and northeast California. An earlier report, which summarizes the geology and its relation to resources (Doebrich, 1996), serves as a foundation for the interpretative discussion in the present report. The 1:2,000,000 map scales of figures 3 and 5 in the presesent report match the map scales of Doebrich (1996).

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Section: Contentsmentioning

confidence: 99%

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Plouff¹

1997

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“…If standard deviations were sufficiently small, constant values of observed gravity based on ties to observations by the U.S. Geological Survey or to data point" from other sets were added as datum shifts to improve compatibility. The following datum shifts were determined in the Reno 1° by 2° quadrangle by Plouff (1994) and, except for the California part and the Winnemucca 1° by 2° quadrangle , were applied to the rest of the study and adjacent areas. A datum shift of 0.55 mGal was subtrrcted for data from source #2649 and 0.10 mGal was subtracted (also Plouff, 1976) for data from sources #5116 and #5130.…”

Section: Data From the National Geophysical Data Centermentioning

confidence: 99%

“…Study of Carson Sink Wahl and Peterson (1976) collected gravity data for a study of Carson Sink in the Lovelock and Reno 1° by 2° quadrangles (file WAHLLOV.ISN and in file RENO95.ISN). The data were obtained in digital format from NGDC source #2235 for a study of the Reno quadrangle and were supplemented by typing principal facts (and adjusting the observed-gravity datum) for data in the report by Wahl and Peterson (1976) but not in NGDC source #2235 (Plouff, 1994). The prefix "SH was substituted for the number 2235 for station identification.…”

Section: Data Compiled or Collected By Us Geological Survey Before 1993mentioning

confidence: 99%

“…The DMA applied a correction of-14.58 mGal to 1963-1964 data in source #2235 and a correction of -13.70 mGal to 1975 data in source #7942 compared to values published by Wahl and Peterson (1976). Evaluation of previous ties made in the Reno quadrangle (Plouff, 1994) and a tie made June 20,1993 (file BLM938.FLD) between the DMA prin^<uy base station at the Fallon, Nevada airport and the site of Wahl's primary base station, "SFALL", (R.R. Wahl, written commun., 1988), provided the basis for subtracting 14.17 mGal from the published values in the Reno quadrangle instead of the NCDC values.…”

Section: Data Compiled or Collected By Us Geological Survey Before 1993mentioning

confidence: 99%

“…Field data obtained from R.R. Wahl (written commun., 1988) for gravity data collected in 1961-1964 in and adjacent to the Reno quadrangle were typed into computer files (Plouff, 1994). Inasmuch as details of data analysis, including possible later ties, are not known to me, the field data were not reduced to revise values of observed gravity but were used to evaluate data accuracy and to identify values that might significantly differ from the published values.…”

Section: Data Compiled or Collected By Us Geological Survey Before 1993mentioning

confidence: 99%

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Principal facts and field observations for gravity data in and adjacent to the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California

Plouff¹

1996

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COMPILATION METHODSSteps to improve quality during the compilation of existing gravity data were to delete duplicate data, to correct or delete erroneous data, and to evaluate the accuracy of accepted data. Duplicate data could not be easily identify when previous compilers modified values of observed gravity, modified locations, or copied earlier data into their sets and then substituted different station names. The pattern of two sets of sequence numbers at associated data points ofter could be recognized except in cases where a later compiler modified locations or sorted data points by their latitude and then replaced original station numbers with numerical sequence numbers. Unless a less accurate data point is close! ' surrounded by data points of a less accurate data set or the data set with generally higher accuracy apparently cipied the less accurate data point, the less accurate data point was discarded.Data points with the same station names as other data points or without a station name, which occurred in subsets of data from the National Geophysical Data Center (table 2), were assigned unique station names. Data points located near spot elevations or bench marks, near cultural features such as roads or marked section corners, or arranged along regularly-spaced lines or grids generally were accepted with minor modifications. The last method for identifying data points to be rejected, corrected, or accepted was to look for conspicuous disagreements (forming one-station "bnllseye"

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Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California

Cited by 2 publications

References 11 publications

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Principal facts and field observations for gravity data in and adjacent to the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California

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