As the significance of geochemical anomalies is affected by some stochastic factors, such as the differences in geological backgrounds and micro-geochemical landscapes of ore deposits, ore deposits frequently lie outside geochemical anomalies. In spite of this, the ore deposits and geochemical anomalies also show their intrinsic relationship. Under the probability of 0.05 of anomalous data, the impact sphere or renormalisation boundaries of geochemical anomalies at the scale of 1∶200 000 and 1∶500 00 should be extended outwards by 5 km and 0.13 km, respectively, from the anomalies delineated by the threshold. Although there exist different relations between anomalies of different elements or different levels of anomalies of the same element and ore deposits, the relationship of geochemical anomalies to their renormalisation boundaries indicates that there might exist some undetected anomalies between the anomalies delineated by calculated threshold and their renormalisation boundaries. This is helpful to improve the effects of applying geochemical anomalies for mineral exploration, and should not be neglected in the prospecting for ore deposits. The correlation lengths calculated from frequencies of different levels of anomalous data of the Daijiazhuang lead-zinc deposit reveal that the scale plays a decisive role in calculation of correlation lengths under the condition that frequencies of anomalous data are less than 10%.