Titlebook: Gold metallogeny and exploration; R. P. Foster Book 1991 Blackie and Son Ltd 1991 chemistry.database.deposits.distribution.environment.gol

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Auriferous hydrothermal precipitates on the modern seafloor,tions, mixed chemical and clastic sediments, tuffaceous exhalites, and disseminated or massive sulphides in both volcanic- and sediment-dominated sequences. Gold-bearing iron formations and interflow metalliferous sediments associated with seafloor hydrothermal activity also have been implicated as

有雜色

Ancient placer gold deposits,, they present economically attractive exploration targets. Individual ancient placer deposits like the Steyn/Basal placer in the Welkom goldfield of South Africa have produced in excess of 4500 t (metric tons) of gold from heavy mineral concentrates distributed over a palaeosurface area of 170 km.

Measured

Geochemical exploration for gold in temperate, arid, semi-arid, and rain-forest terrains,atures of which must be identified in the various sampling media (rock, soil, etc.) used for exploration. The geochemical signature of gold mineralization depends upon several parameters, particularly the style of mineralization in question and the physico-chemical characteristics of the supergene e

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怪物

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Blackie and Son Ltd 1991

創(chuàng)新

glowing

Economics of gold deposits,and, then, mining, recovering and selling gold from them. Thus, economic deposits are the focal point of the gold-supply process. The economic characteristics of gold deposits are shaped by their geological features. Gold deposits are initially unknown and, once discovered, are fixed in size and highly variable in quality.

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