Colonial Placer Mining in Colombia
نویسندگان
چکیده
منابع مشابه
Pre-colonial mining in southern Africa
Mining, as defined by Stocks and Down is the ‘removal of minerals from their natural geological environment and their transport to the point of processing or use1’. As so defined mining has, in one form or another, been providing essential raw materials for tens of thousands of years. Although metal ores were first mined in southern Africa (south of 15°S) approximately 2 000 years ago, minerals...
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Gold-mining may play an important role in the maintenance of malaria worldwide. Gold-mining, mostly illegal, has significantly expanded in Colombia during the last decade in areas with limited health care and disease prevention. We report a descriptive study that was carried out to determine the malaria prevalence in gold-mining areas of Colombia, using data from the public health surveillance ...
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This report provides details on field activities in placer geology conducted by the Applied Geochemistry and Surficia1 Geology Section of the British Columbia Geological Survey Branch. I n 1989, the provincial government expanded the area open to placer mining substantially, and the need for new exploration techniques in these regions was recognized. Studies of gold-hearing placer deposits ...
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Place labeling is the process of giving semantic labels to locations, such as home, work, and school. For a particular person, these labels can be computed automatically based on features of that person’s visits to these locations. A previous system called Placer used the person’s demographic data and the timing of their visits to label places with a learned decision tree. We developed Placer++...
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There is a set of rectangular macros with given dimensions, and there are wires connecting some pairs (or sets) of them. We have a placement area where these macros should be placed without overlaps in order to minimize the total length of wires. We present a heuristic algorithm which utilizes a special data structure for representing two dimensional stepfunctions. This results in fast integral...
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ژورنال
عنوان ژورنال: Hispanic American Historical Review
سال: 1953
ISSN: 0018-2168,1527-1900
DOI: 10.1215/00182168-33.2.271