Abstract:

Altered rock type copper deposits of fracture zone connected with banded ferruginous formation of Mesoproterozoic group were found recently in Jingtishan area of North Qilian Mountains, for example,Huashugou and Liugouxia copper deposits. The essential factors were discussed in this paper. It is considered that the cupreous banded iron formation was source bed； pervasive fractures were favorable to mineral activities； the heat source was crustal magma activities； and structural fracture altered zone was ore-contained structure. The formula for quantitative forecast of Jingtieshan-type copper ore is built in this paper.The value of representative to the resource potential of copper,weight of ironstone,growth degree of pervasive fractures and thermal parameter are disscused. According to the aforementioned formula, the copper resource potential of Jingtieshan-type may be 1.473×10⁶ tons in the western segment of North Qilian including up to 1.25×10⁶ tons in the Jingtieshan ore field. The new favorable districts are discovered in our inspection, so the prospecting is necessary to continue in this area.

Key words: Jingtieshan-type, altered rock type copper deposit in fracture zone, essential factors for prediction, predictive model, North Qilian Mountains