Abstract: Take the site prediction of three gold lode deposits as examples, the authors try to show the key role of major ore constraints in site prediction-strategic directing. The major constraint of the Reshui Gold Deposit in Chifeng, Inner Mongolia is a gently dipping dioritic porphyrite, which controlled the distribution of the gold lodes in the deposit and 100-300 m distance over the hanging wall of the dioritic porphyrite is the best site for gold mineralization. The merging sites of three major faults near the contacts between the Linglong granite intrusion and the Guojialing granodiorite intrusion controlled the ore bodies in the Jiehe gold deposit, Zhaoyuan, Shandong Province. The major ore constraint of the Jiudian gold deposit, Pingdu, Shandong Province is a NW trending silicified fault zone and all the auriferous quartz veins at both the footwall and hanging wall of the fault zone are within a range of 2 km. To determine the major ore constraints of gold deposits is significant to site prediction of gold lode deposits and needs detailed examination of mine data, exhausted geological study of the mine and comprehensive exploitation of geochemical and geophysical data.

Key words: gold lodes, site prediction, major ore constraint