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DETERMINATION OF LOWER LIMIT OF ORE-FORMING ELEMENT ANOMALY AND DISCUSSION ON DIVISION OF THREE-GRADE CONCENTRATION ZONE

CHEN Tie-shan(Geophysical Exploration Team of East China Metallurgical Bureau of Geology and Exploration,Wuhu,Anhui 241009,China)  
Statistics of lower limits of anomalies appears very important and is closely related to three-grade concentration zone division,regardless of regular or irregular measuring network for soil geochemical surveying method.Guiding test work is also very important.This paper,based on practice by Geophysical Exploration Team of East China Metallurgical Bureau of Geology and Exploration,discussed the result of the method application.
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