Valuable metal extraction process

The present invention provides a high concentration containing manganese in an acidic solution with a method for selective extraction of copper and / or lead from. Valuable metal extractant according to the present invention is represented by the following formula. Formula, R1 and R2 each represent the same or different alkyl group, R3 represents a hydrogen atom or an alkyl group, R4 represents a hydrogen atom, or by a bond as amino acids and α carbon of any other than the amino group. Following general formula having a glycine unit, histidine unit, lysine unit, aspartic acid unit, or N- methyl glycine units. In using the above extractant for copper and / or lead, preferably adjusting the pH of the acidic solution is 1.0 or more and 5.5 or less.