NOVELTY - Method for separating valuable elements associated with gold, involves (a) preparing composition of bacterial liquid, (b) performing decarburization and dephosphorization, (c) performing selection, and (d) preparing bacterial fertilizer.    USE - The method is useful for separating valuable elements associated with gold and treating polluted soil using bacteria fertilizer (all claimed).    ADVANTAGE - The method consumes less energy, causes no pollution, is simple to perform, and capable of simultaneous separation of large-scale industrial and valuable elements, and changes waste into treasure.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for treating polluted soil using bacteria fertilizer, where the preparation of bacteria fertilizer, which involves (a) preparing composition of bacterial liquid using 25 wt.% Rhodococcus, 20 wt.% Acidithiobacillus ferrooxidans, 15 wt.% nitrification bacteria, 15 wt.% Bacillus cereus, 10 wt.% Alcaligenes faecalis, 10 wt.% Aspergillus niger, and 5 wt.% Thiobacillus denitrificans, where the concentration of each bacterium is 2x 108 bacteria/ml, (b) crushing the gold-containing iron ore using crusher, adding the crushed ore to ball mill, grinding the ore till the particle diameter of the obtained powder is 100 meshes, mixing the powder with limestone of more than 100 meshes, uniformly stirring the mixture, adding the mixture through the upper portion of the reactor, spraying the composition of bacterial liquid to the reactor, performing desulphurization/decarburization and dephosphorization treatment, uniformly stirring the composition of bacterial liquid with the mixture at the lower portion of the reactor, controlling the stirring speed at 100 revolutions per minute (rpm), maintaining the temperature of the reactor at 30 degrees C, and obtaining mixture A, (c) selecting the mixture A through the discharging portion, filtering the mixture, recycling the filtrate and filter residue, drying the filter residue at 70-80 degrees C, adding water, then processing the obtained mixture with magnet to obtain high-grade iron powder and tailings, adding water to the tailings, uniformly stirring to obtain mixture B, adjusting pH of the mixture B to 3-11 using lime, and then adding sodium cyanide gold to the mixture B, and (d) preparing bacterial fertilizer by performing extraction of the mixture B, filtering the extract, mixing the filtrate with metal carrier in a weight ratio of 1:1, uniformly stirring the mixture, drying the mixture at low-temperature using dryer, and maintaining the water content of the mixture at 10% to obtain bacterial fertilizer, where the carrier includes turfy soil, sawdust, wheat bran and diatomite in a mass ratio of 5:3:2:1.