At the same time the basic method for statistical prognosis of giant deposits based on the technology system of the Digital Earth is stud.

Geochemical blocks are the giant roc k blocks with high content of one or mo re elements within the upper earths crust,they are the net resul ts of the earths original heterogen eity and the distribution and redistribution of metals during the evolution of the earth up to the present days and provide large metal endowments necessary fo r the formation of large to giant ore deposits.

Laznicka’s defination for giant and supergiant ore deposits is unsuitable for all ore deposits.

The δ30Si and δ18O of the cherts from the Gacun Kuroko-type deposit were determined for the first time and have been compared with those of the silica chimneys from modern seafloor hy-drothermal fields.

3D deposit model based on artificial neural network;

Aid tool for building deposit model and its development;

In this paper the deposit model is established, industry parameters are optimized, the orebody is reshaped and gold reserves' increment is calculated to be 10 tons.