Results 261 to 270 of about 15,358 (309)
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1991
Alluvial, or placer, gold has been washed away by flowing water or carried by blowing wind. It has then been deposited along with earth, sand, gravel, and other transported matter, especially on river beds. Although there is no way of knowing exactly how long ago humans felt enamored of the shiny yellow metal, there is reason to presume that gold ...
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Alluvial, or placer, gold has been washed away by flowing water or carried by blowing wind. It has then been deposited along with earth, sand, gravel, and other transported matter, especially on river beds. Although there is no way of knowing exactly how long ago humans felt enamored of the shiny yellow metal, there is reason to presume that gold ...
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Proceedings, 2018
Summary Indonesia is a country of Island arcs setting, tectonically. This setting has induced many of volcanoes Indonesia followed by the presence of mineral deposits. As the consequences of never-ending demand for ore minerals, exploration of mineral deposits are always needed. The study area is located in Kulonprogo, Yogyakarta.
I.D. Putra +3 more
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Summary Indonesia is a country of Island arcs setting, tectonically. This setting has induced many of volcanoes Indonesia followed by the presence of mineral deposits. As the consequences of never-ending demand for ore minerals, exploration of mineral deposits are always needed. The study area is located in Kulonprogo, Yogyakarta.
I.D. Putra +3 more
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1991
In this chapter, ancient placers refer to deposits of Archaean and early Proterozoic age. Because each deposit may cover hundreds of square kilometres, 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
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In this chapter, ancient placers refer to deposits of Archaean and early Proterozoic age. Because each deposit may cover hundreds of square kilometres, 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
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Placer Deposit: From Modeling to Evaluation
2013The report is devoted to methodology of prognostic-search model construction of ore placer deposit on the basis of its multifactor multitag models under study by logic-informational methods. The logic-informational model is represented by feature set, informative for solution of prognostic problem. All informative tags receive a quantitative estimation
Nikolay Laverov +2 more
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Logarithmic pattern in river placer deposits
Economic Geology, 1949This paper presents the results of a series of 10 experiments made in the laboratory with a wooden trough, supplemented by 10 cases taken from actual placer maps. These data give the following concordant results, checking with each other:1. Deposition areas and erosion areas alternate with each other.2.
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Tin Placer Deposits on Continental Shelves
2017A review of the geology of tin placer deposits on continental shelves is attempted. Under the heading of general characteristics, primary tin mineralization, distance of transport of cassiterite, dating and age of formation, concentration, preservation, and classification are examined.
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