Alluvial Prospecting Research Articles

Prospecção aluvionar aplicada a alguns minerais gemológicos de Minas Gerais: diamante, crisoberilo e topázio

Prospecção aluvionar foi efetuada em drenagens de reconhecida ocorrência de três minerais gemológicos (diamante, crisoberilo e topázio), visando a contribuir para o conhecimento de suas associações mineralógicas e tendências de distribuição no meio aluvionar. Sob condições semelhantes, observou-se uma "taxa de dispersão" relativa para cada um dos três minerais, com provável decréscimo do diamante para o topázio. Essa técnica prospectiva, combinada com métodos analíticos modernos, é considerada uma ferramenta de importância fundamental na detecção e avaliação de áreas aluvionares mineralizadas.

Prospection mini�re dans la r�gion Friuli-Venezia Giulia (Alpes Orientales)

Mineralogical alluvial prospecting search for base metals have been carried out from 1968 to 1970 in the Friuli — Venezia Giulia region. The Carnia, a part of this region, was well known from ancient times as an important mining district. Numerous anomalies of the content of some elements and minerals in river sands have been recognized by means of the above mentioned searches. This indicates that important and till now unknown ore concentrations are possible in this region. In fact three new sphalerite and/or galena concentrations and one fluorite concentration in association with As-sulphides have already been discovered during a partial development of these surveys. In the present work the advantages of alluvial prospecting in mining searches are remarked. Moreover method and application of mineralogical alluvial prospecting are described. In the last paragraph the steps which allowed the discovering of the new metal concentrations are reported in detail. The discovered concentrations are shortly analyzed. Strict aim of this note is to indicate the value and scientific importance of the described method.

Kimberlite and related rocks from the Nama Plateau of South-West Africa

The Gibeon Kimberlite province contains at least forty-six pipes and sixteen major dykes of mainly basaltic kimberlite besides several occurrences of a more carbonatitic character which include the Gross Brukkaros carbonatite volcano, the Blue Hills monticellite peridotite, the Hatzium dome and the Mukorob dyke. The paper describes briefly the regional geology of the Nama Plateau, the location and outcrop characteristics and petrology of the kimberlites and related rocks and a method of their detection by alluvial prospecting. The writer suggests that all these rocks are related and form part of the same petrological province. Various analytical data allow the construction of a diagram which shows a smoothly curved direct petrogenetic relationship between the kimberlites and the carbonatitic rocks of the Gibeon province. The evolution of kimberlite provinces is thought to be controlled by their tectonic environment with kimberlites ascending rapidly in zones with convex curvature of the crust while carbonatitic rocks result from an interrupted or slow ascent in zones of concave curvature.

Alluvial Prospecting. C. Raeburn , H. B. Milner

<i>Alluvial Prospecting</i>. C. Raeburn , H. B. Milner

Alluvial Prospecting: the Technical Investigation of Economic Alluvial Minerals

PRECEDED by an inspiring foreword by Dr. J. D. Falconer, the main body of the text of the work which is at present under review consists of an introduction and ten chapters dealing, amongst other matters, with the classification, lithology, provenance and association of alluvial and allied deposits and minerals; theories of transport and accumulation; prospecting methods;. geophysical aids; field work; the report; and laboratory methods. The book in its aim and scope stands alone. It represents a determined effort to raise alluvial prospecting to the status proper to the initial operations of a branch of the world's second most important basic industry mining. Alluvial Prospecting: the Technical Investigation of Economic Alluvial Minerals. By Dr. C. Raeburn Henry B. Milner. Pp. xix + 478 + 32 plates. (New York: D. Van Nostrand Co.; London: T. Murby and Co., 1927.) 36s. net.

Alluvial Prospecting: The Technical Investigation of Economic Alluvial Minerals

Alluvial Prospecting: The Technical Investigation of Economic Alluvial Minerals