Show gold extraction briefly the method of separating small particles of gold from gravel and sand fand in placer mining depends on the fact that it Is one of 0 the hear lest metals masses of the gravel and sand are stirred up with water and the heavy gold sinks to the bottom metallic mercury Is also used to catch the gold particles because of its great affinity tor for told gold gold plating Is performed by passing an electric current through a solution of one of the salts of gold a bar of gold Is connected to the positive terminal within the solution and the article to be plated Is connected to the negative terminal |