Metal leaching method

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PROBLEM TO BE SOLVED : To provide a method for leaching metal, by which metal compositions such as copper and zinc included in a waste electronic substrate can be efficiently recovered and precious metals such as rare metal, gold and silver can be also recovered.SOLUTION : In the method for leaching metal from a wasted electronic substrate, waste electronic substrate powder including copper and iron is added to an acid liquid, and metal is leached in a condition where temperature is 100°C or above and oxygen partial pressure is 1-4 MPa. The acid liquid has an acid concentration of 0.5-3 mol/L and is a sulfuric acid aqueous solution is preferable.