Solution mining is a available method to extract gold from lean ore, relic, waste dumps and tailings. Based on the experiment research for low grade gold minerals containing high proportion of clay and powder, a new gold extraction process, i.e. granulation-cyaniding pre-treatment-heap leaching is described. The results show that this new process can enhance the gold leaching rate from the clay-containing ore, increase the leaching speed, shorten operational cycle, cut production costs and improve environment conditions.