Process for the treatment of waste electronic boards, which comprises the following main stages: (i) removal of the electronic components containing dangerous substances from the surface of the boards; followed by (ii) crushing and grinding the boards to a particle size of less than 2 mm; (iii) bringing the ground boards into contact with a first leaching solution, in which the first leaching is performed in counter-current conditions and carried out in two steps in each of which the ground material obtained from the treatments (i) and (ii) is treated; wherein in a first step a freshly prepared acid solution is used, said solution comprising sulfuric acid in a concentration of 1.5-2 mol/l and hydrogen peroxide, and in a second step the same solution used in the first step is used again after separating it from a first solid fraction; and wherein, in order to recover tin and copper, at the end of stage (iii) a solution containing copper solubilized as sulfate and tin as metastannic acid is separated from a second solid fraction by means of filtration and the solid fractions, consisting of the ground boards in which gold and silver to be recovered are still present, is washed with water; (iv) selective recovery of the tin and copper from the solution of stage (iii) by means of flocculation and cementation and precipitation techniques, wherein the tin is recovered by means of a flocculation stage with flocculating agents in order to precipitate a solid flocculent precipitate consisting of metastannic acid which is separated by means of filtration from the solution of stage (iii), and copper is recovered by means of a cementation stage carried out by adding zinc powder to the solution obtained from the flocculation stage, without the flocculent precipitate which has been removed, a metallic precipitate being separated from the solution by means of filtration at the end of cementation; (v) bringing the solid fractions obtained from the first leaching treatment of stage (iii) into contact with a second leaching solution including thiourea, ferric sulfate and sulfuric acid, in which the second leaching is performed in order to extract gold and silver; (vi) recovery of gold and silver from the solution obtained from stage (v) by means of neutralization and cementation. (i) removal of the electronic components containing dangerous substances from the surface of the boards; followed by (ii) crushing and grinding the boards to a particle size of less than 2 mm; (iii) bringing the ground boards into contact with a first leaching solution, in which the first leaching is performed in counter-current conditions and carried out in two steps in each of which the ground material obtained from the treatments (i) and (ii) is treated; wherein in a first step a freshly prepared acid solution is used, said solution comprising sulfuric acid in a concentration of 1.5-2 mol/l and hydrogen peroxide, and in a second step the same solution used in the first step is used again after separating it from a first solid fraction; and wherein, in order to recover tin and copper, at the end of stage (iii) a solution containing copper solubilized as sulfate and tin as metastannic acid is separated from a second solid fraction by means of filtration and the solid fractions, consisting of the ground boards in which gold and silver to be recovered are still present, is washed with water; (iv) selective recovery of the tin and copper from the solution of stage (iii) by means of flocculation and cementation and precipitation techniques, wherein the tin is recovered by means of a flocculation stage with flocculating agents in order to precipitate a solid flocculent precipitate consisting of metastannic acid which is separated by means of filtration from the solution of stage (iii), and copper is recovered by means of a cementation stage carried out by adding zinc powder to the solution obtained from the flocculation stage, without the flocculent precipitate which has been removed, a metallic precipitate being separated from the solution by means of filtration at the end of cementation; (v) bringing the solid fractions obtained from the first leaching treatment of stage (iii) into contact with a second leaching solution including thiourea, ferric sulfate and sulfuric acid, in which the second leaching is performed in order to extract gold and silver; (vi) recovery of gold and silver from the solution obtained from stage (v) by means of neutralization and cementation.