THE CYLINDRICAL ORE BODY IN THE PRESENCE OF A CABLE CARRYING AN OSCILLATING CURRENT

Geophysics ◽  
1952 ◽  
Vol 17 (2) ◽  
pp. 378-386 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Electrical Properties ◽  
Massive Sulphide ◽  
Conducting Medium ◽  
Geophysical Prospecting ◽  
Conducting Cylinder ◽  
Sulphide Ore ◽  
Ore Body ◽  
The Media ◽  
Special Case ◽  
Ore Zones

The problem of an infinite cable carrying an oscillating current parallel to a conducting cylinder is solved. The homogeneous electrical properties of the media inside and outside the cylinder can be arbitrary. The special case is considered in detail where the exterior medium is a relatively poor conducting medium. The application to geophysical prospecting for massive sulphide ore zones is discussed.

THE INVESTIGATION OF EARTH RESISTIVITIES IN THE VICINITY OF A DIAMOND DRILL HOLE

Geophysics ◽  
1951 ◽  
Vol 16 (4) ◽  
pp. 659-665 ◽  
Author(s):  
A. R. Clark ◽  
D. J. Salt
Keyword(s):  
Drill Hole ◽  
Conducting Medium ◽  
Electrical Measurements ◽  
Conducting Sphere ◽  
Diamond Drill ◽  
Sulphide Ore ◽  
Ore Body ◽  
The Difference ◽  
Commercial Size ◽  
Made In

The method of electrical images has been used to derive an expression for the difference in potential between two points close to a good conducting sphere in a poor conducting medium. The results indicate that the presence of a conducting ore body of commercial size near a drill hole can be detected by suitable electrical measurements made in the hole. The results of a test of the method in a drill hole near a small conducting sulphide ore body are given.

Merging Traffic

2018 ◽  
Author(s):  
Mark Slobin
Keyword(s):  
African American ◽  
Auto Industry ◽  
General Motors ◽  
Musical Life ◽  
United Auto Workers ◽  
Folk Revival ◽  
Auto Workers ◽  
The Media ◽  
The 1950S ◽  
Special Case

This chapter surveys the institutions and movements that brought together the city’s musical life with the aim of merging disparate styles, trends, and personnel. First comes the auto industry, based on archival sources from Ford and General Motors that show how the companies deployed music for worker morale and company promotion. The complementary work of labor follows, through the United Auto Workers’ songs. Next comes the counterculture’s musical moment in the age of the folk revival and the artist collectives of the 1950s–1960s. Motown offers a special case of African American entrepreneurial merging of musical talent and style. The chapter closes with a look at the media—radio and newspapers—with their influential role in bringing audiences together, through music, in a city known for segregation, oppressive policing, and occasional outbursts of violence.

scholarly journals The Coulon deposit: quantifying alteration in volcanogenic massive sulphide systems modified by amphibolite-facies metamorphism

2016 ◽  
Vol 53 (12) ◽  
pp. 1443-1457 ◽  
Author(s):  
Lucie Mathieu ◽  
Rose-Anne Bouchard ◽  
Vital Pearson ◽  
Réal Daigneault
Keyword(s):  
Mass Balance ◽  
Massive Sulphide ◽  
Amphibolite Facies ◽  
High Grade ◽  
Bay Area ◽  
Volcanogenic Massive Sulphide ◽  
High Grade Metamorphism ◽  
And Performance ◽  
Superior Craton ◽  
Ore Zones

The Coulon deposit is a volcanogenic massive sulphide (VMS) system in the James Bay area, Superior craton, Quebec, that was metamorphosed to amphibolite-facies conditions. The chemistry and mineralogy of the VMS-related alteration halo proximal to the mineralized sulphide lenses are investigated, using samples collected in the field and 5583 chemical analyses provided by Osisko Ltd. Alteration is quantified using mass balance and normative calculations, and the application and performance of these methods in an exploration context are investigated. In VMS systems, altered rocks proximal to the ore zones are characterized by multi-element metasomatism, which is best quantified by mass balance methods that have been successfully applied in the study area. However, mass balance calculations necessitate the documentation of a precursor, which is not always possible in an exploration context; therefore, an alternative method (i.e., alteration indices) was also evaluated. In most VMS systems, proximal alteration is characterized by chlorite (chloritization), muscovite (sericitization), and quartz (silicification), while at the Coulon deposit, altered rocks contain mostly cordierite, biotite, sillimanite, and quartz. Alteration indices were calculated using observed and normative minerals, and provide satisfactory results similar to those obtained with mass balance calculations. Using these results, recommendations are made to estimate the intensity of alteration in the core shack using the proportions of observed minerals. Alteration indices are sensitive to the composition of precursors; and because of high-grade metamorphism, chloritization and sericitization are not precisely quantified. Recognizing these limitations is essential to successful quantification of alteration in areas metamorphosed to high-grade conditions.

Variations in platinum group element concentrations in the Alexo mine komatiite, Abitibi greenstone belt, northern Ontario

1986 ◽  
Vol 123 (5) ◽  
pp. 515-524 ◽  
Author(s):  
Sarah-Jane Barnes ◽  
A. J. Naldrett
Keyword(s):  
Platinum Group Element ◽  
Group Element ◽  
Massive Sulphide ◽  
Mass Balance Calculation ◽  
Northern Ontario ◽  
Sulphide Liquid ◽  
Sulphide Ore ◽  
Intermediate Degree ◽  
Co Concentrations ◽  
Massive Sulphides

AbstractThe noble element (Os, Ir, Ru, Rh, Pt, Pd, Au) patterns from sulphides associated with the komatiites at the Alexo mine show variable degrees of fractionation. Massive sulphides at the contact between underlying intermediate volcanics and overlying komatiites have the least fractionated patterns (Pd/Ir = 44). Net-textured sulphides which immediately overlie the massive sulphides have extremely fractionated noble element patterns (Pd/Ir = 171). The disseminated sulphides in the overlying komatiite exhibit an intermediate degree of fractionation (Pd/Ir = 110). The variations in noble element patterns are complemented by variations in the Ni, Cu and Co concentrations. The massive sulphides are depleted in all three of these elements relative to the net-textured sulphide ore. The disseminated sulphides have intermediate values of Ni and Co, but are enriched in Cu relative to the other two sulphides.Processes that could have affected the composition of the sulphides include: (a) fractionation of monosulphide solid solution (Mss) from a sulphide liquid during initial cooling of the komatiite, and (b) mobilization of Pt, Pd, Au, Cu, Ni and Co from the massive sulphide into footwall veins. A mass balance calculation indicates that the sum of the massive and net-textured sulphide agrees with the disseminated sulphide for all elements except Au. Thus the massive sulphide cannot have lost significant amounts of Pt, Pd, Ni and Co to footwall veins and significant mobilization of these elements does not appear to have occurred. The crystallization of Mss from a sulphide liquid will account for the enrichment of Ir, Os, Ru and Rh in the massive sulphide relative to the net-textured sulphide, and enrichment of Pd, Pt, Au, Co and Ni in the net-textured sulphide relative to the disseminated sulphide.

The influence of currents induced in the host rock on electromagnetic response of a spheroid directly beneath a loop

Geophysics ◽  
1981 ◽  
Vol 46 (8) ◽  
pp. 1121-1136 ◽  
Author(s):  
Alexander A. Kaufman
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Asymptotic Expression ◽  
Surrounding Medium ◽  
Electromagnetic Response ◽  
Ore Body ◽  
Ore Bodies ◽  
Integral Equation Approach ◽  
Em Field ◽  
Special Case

A variety of time‐domain and frequency‐domain electromagnetic (EM) methods has come into use in minerals exploration for detection of conductive ore bodies. Because the responses of these various systems differ markedly from one another, the question arises as to which is the most effective for use in discovering a buried, conductive ore body. The question can be posed as follows: What type of exploration system provides the best signal‐to‐noise (S/N) ratio, when signal is defined as the anomalous EM field caused by the presence of a target body and noise is defined as EM responses from the surrounding medium? Analytic solution of the problem is tedious and has not yet been reported in the literature. I describe some results for a special case which reduces the complexity of the problem somewhat. The case treated is that of a conducting spheroid situated directly beneath a source loop. The EM responses caused by currents in the spheroid and in the surrounding medium were computed in both the frequency domain and time domain, using the integral equation approach, supplemented with evaluations of asymptotic expression for various field components. Results show that the transient method provides the best S/N ratio of the methods considered.

scholarly journals Distribution of Sb minerals in the Cu and Zn flotation of Rockliden massive sulphide ore in north-central Sweden

2015 ◽  
Vol 82 ◽  
pp. 125-135 ◽  
Author(s):  
Friederike E. Minz ◽  
Nils-Johan Bolin ◽  
Pertti Lamberg ◽  
Kai Bachmann ◽  
Jens Gutzmer ◽  
...  
Keyword(s):  
Massive Sulphide ◽  
North Central ◽  
Sulphide Ore ◽  
Cu And Zn

Symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Province

1997 ◽  
Vol 16 (4) ◽  
pp. 359-362 ◽  
Author(s):  
Lianxing Gu ◽  
Wenlan Zhang ◽  
Lin Yin ◽  
Bin Zhou
Keyword(s):  
Anhui Province ◽  
Massive Sulphide ◽  
Sulphide Ore

Motor City Music

2018 ◽  
Author(s):  
Mark Slobin
Keyword(s):  
Classical Music ◽  
Black Immigrants ◽  
Musical Life ◽  
Musical Identity ◽  
The Public ◽  
Time Period ◽  
Comprehensive Survey ◽  
The Media ◽  
Special Case

The book combines memoir, interview, and archival sources to survey the musical life of the author’s hometown, Detroit, in his youth during the city’s heyday, 1940s–1960s. After an opening chapter on the formation of personal musical identity, the focus shifts to the formative role of the public school system in educating and shaping the careers of waves of highly talented youth, many of whom became leading figures in African American and classical music nationally. Next comes a panorama of the “neighborhood” subcultural musics of European, southern white, and southern black immigrants to Detroit, followed up by a close-up of the Jewish community’s special case. “Merging Traffic” considers the way that industry, labor, the counterculture, Motown, and the media brought many streams of music together. A final retrospective chapter cites the work of Detroit writers and artists who, like the author, have been looking back at the city’s impact on their work. This is the first-ever comprehensive survey of the musical life of any American city in a given time period.

Inter-Country Adoption Policy in Australia — The Abnegation of Responsibility?

1982 ◽  
Vol 7 (2) ◽  
pp. 10-14
Author(s):  
Cliff Picton ◽  
Rosemary Calder
Keyword(s):  
Present Situation ◽  
Walk Away ◽  
Code Of Practice ◽  
The People ◽  
The Status ◽  
Uniform Code ◽  
The Media ◽  
Special Case

Recent revelations in the media about the status of some Taiwanese children adopted by Australians raised again the issue of safeguards, official policies and practice in inter-country adoption. For many of the people significantly engaged in urging a raising of standards, the present situation and future possibilities foreshadowed in official quarters leave little room for optimism. In spite of well documented arguments for a uniform code of practice, responsibilities remain divided, offering loopholes for those who believe they have a special case that puts them outside the laid down procedures for assessment and approval. This paper argues that governments in Australia (State and Commonwealth) must not be allowed to walk away from responsibilities in inter-country adoptions, responsibilities which are firmly established and recognised as appropriate in domestic adoptions.

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