Characteristics of Tungsten & Molybdenum Geochemical Anomalies and Their Ore-Forming Regularity in Gansu Beishan and Its Adjacent Area

The authors have located some trend remaining geochemical anomalies of W,Sn,Mo,Bi in the region of Gansu Beishan and its adjacent area by trend surface analysis of geochemical exploration data with scale of 1:200000.The distribution and the element association of the anomalies correspond to geological conditions of the region including three factors which are the special rocks within certain strata,certain fault structures,certain acid intrusions;and also correspond to the ore deposits found.The study results of typical tungsten ore deposits in the region show that the distributions of the ore deposits and the anomalies are controlled by the three factors;and big scale ore deposits are usually located in the area where the three factors overlap.The types of the deposits are complex,and ore in these deposits contains more useful components.According to some of the anomalies with regular ship and high content distributing at old mines of other metals and their surrounding areas,the authors suggest that prospecting work for W and Mo should start in these areas,and that recover W and Mo from these ore deposits should be taken notice of.