http://www.sciencedirect.com/science/article/pii/S1674987111000569 |
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Authors: | Xuejing Xie Yinxiu Lu Wensheng Yao Jinfeng Bai |
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Institution: | Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, 84 Jinguang Road, Langfang,Hebei 065000, China |
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Abstract: | A study of deep penetrating geochemistrydthe surface exploration techniques for finding
concealed mineral depositsdwas carried out over the Spence porphyry copper deposit in Chile by
Australian, Canadian and Chinese laboratories using selective weak leach methods and is briefly reviewed
here. Erratic and weak copper anomalies were obtained above the Spence deposit, which is concealed
below a thick piedmont gravel cover. In the literature, such patterns are common in most of the weak
selective leach studies carried out over known buried deposits. During exploration in unknown area, such
weak leach techniques lead to some success and many dry holes. In this paper, stronger selective leaching
methods are developed for oxides and sulfides, which may be the stable end products transformed and
accumulated by a mobile precursor phase carried upward through the overburden by gas or water through
long spans of geological time. The data obtained by the methods developed in this paper produced more
significant and consistent anomalous data than previous efforts. Consequently, the leach approaches
described here may increase the effectiveness of deep penetrating geochemistry in exploration for concealed
ore deposits. |
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Keywords: | Deep penetrating
geochemistry Selective leach Oxides Sulfides Spence Cu deposit Chile |
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