Spectrographic evidence on origin of ores of Mississippi Valley type

Graton, Louis Caryl; Harcourt, G. A.

doi:10.2113/gsecongeo.30.7.800

Cited by 22 publications

(11 citation statements)

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“…Spurr (1924, p. 246-250, 287-292) in his discussion of ore magmas reaffirmed the magmatic hypothesis for origin of the ore. Investigations by Emmons (1929), Newhouse (1933), Graton and Harcourt (1935), Garrels (1941), andHemley (1953), indicate a probable lowtemperature hydrothermal origin for these deposits from a postulated deep-seated source beneath the district. Newhouse (1932, p. 435) believes that sodium chloride concentration in solutions found in galena and sphalerite from Mississippi Valley ores excludes the possibility of their formation by descending meteoric waters.…”

Section: Origin Of the Orementioning

confidence: 92%

Geology of the Dodgeville and Mineral Point quadrangles, Wisconsin

Allingham¹

1963

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Section: Origin Of the Orementioning

confidence: 92%

Geology of the Dodgeville and Mineral Point quadrangles, Wisconsin

Allingham¹

1963

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“…Most of the analyses are negative with repsect to gallium and, in those isolated cases where gallium is present, concentrations never exceed 0.001%. Some data (Papish, et al, 1930 andGraton andHarcourt, 1935) on foreign non-skarn polymetal deposits are available. These authors have reported that gallium in sphalerite from the Leadville, Mammoth (USA), Raibl (Austria), and Cerro de Pasco (Peru) deposits is either absent or gives "very weak" and "weak" spectral lines.…”

Section: Gallium Distribution In Various Other Genetic Types Of Deposmentioning

confidence: 99%

“…According to Papish, et a!., (1930), Stoiber (1940, Graton (1935) and Morris and Breiker (1954), gallium is present in sphalerite from the Mississippi River valley deposits in quantities ranging from 0.01 to 0.1%. Moreover, these concentrations are distributed with rigid regularity in all of the numerous mines and horizons of this region.…”

Section: Downloaded By [Mcgill University Library] At 16:14 07 Februamentioning

confidence: 99%

IGR - Book Section

Vershkovskaya¹,

Krasnova²,

Saltykova³

et al. 1970

International Geology Review

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“…Flow through different rOws must occur simultaneously, therefore it follows directly from probability considerations that in the gravel screen R rows from the sand-gravel interface the fraction of the unit cells that would be filled with sand may be expressed in the following way: [6] If it is assumed still further that each bridge results in the same relative filling of the unit cell with sand, it is possihle to relate .the fraction of the cells filled to the sand content of the gravel screen. On this hasis Eq.…”

Section: M=minmentioning

confidence: 99%

“…Some of the fundamental considerations involved in the migration of sand through a coarser body of porous materials were investigated by Coberly' and Wagner' and further experimental work has been carried out by Gumpertz. 6 Apparently the pertinent phenomena are somewhat complex and are influenced by many variables. The present paper deals with the prediction of the behavior of gravel screens under the conditions encountered in practice but does not attempt to discuss the experimental methods or results that were obtained as a background and upon which the prediction is based.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Gravel Screens

Sage

Lacey

1942

Transactions of the AIME

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The results of an extensive experimental program relating to theeffectiveness of gravel screens have been correlated. The factors considered insome detail include gravel size and condition of packing, sand size and sizedistribution, fluid velocity, fluid viscosity, and thickness and arrangement ofgravel screens. Good agreement between calculated values based upon probabilityconsiderations and experimental results relating to the influence of thethickness of the gravel screen was obtained. All of these factors are treatedin the correlation in order that their influence may be taken into account inascertaining the characteristics of an effective gravel screen for a particularset of conditions. The details of the experimental program are not given in thepresent paper but a description of generalized behavior and typicalexperimental results are recorded in graphic form. Introduction Gravel screens have been placed in water and oil wells for a number of yearswith the dual objective of increasing the productivity and decreasing theentrance of sand into the well bore. An understanding of the factorscontrolling the effectiveness of gravel screens in this connection is ofindustrial interest because it will lead to the proper selection of gravel.Some of the fundamental considerations involved in the migration of sandthrough a coarser body of porous materials were investigated by Coberly andWagner, and further experimental work has been carried out by Gumpertz.Apparently the pertinent phenomena are somewhat complex and are influenced bymany variables. The present paper deals with the prediction of the behavior ofgravel screens under the conditions encountered in practice but does notattempt to discuss the experimental methods or results that were obtained as abackground and upon which the prediction is based. Influence of Gravel Screens Upon Productivity The use of a gravel screen may increase the productivity of a well byincreasing its effective diameter, and this constitutes one of the objectivesof its use. The permeability of most gravels and coarse sands that are employedin practice is so large compared to that of the sand in place that relativelylittle loss in production rate will arise from the use of material fine enoughto cause the desired resistance to sand migration. T.P. 1325

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Spectrographic evidence on origin of ores of Mississippi Valley type

Cited by 22 publications

References 0 publications

Geology of the Dodgeville and Mineral Point quadrangles, Wisconsin

Geology of the Dodgeville and Mineral Point quadrangles, Wisconsin

IGR - Book Section

Effectiveness of Gravel Screens

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