PROBLEM TO BE SOLVED: To provide a carrier of a polymer particle capable of coagulating a mineral concentrate, and a bleeding method for collecting metal values from the mineral concentrate containing the carrier, and capable of standing the bleeding.SOLUTION: A carrier for mineral concentrate is a polymer particle which is 3-20 mm and is poreless structure; of which value of relative density is equal to or less than 1, being able to maintain stability even in a strong acidic environment such as in an acidic solution; which has resistance to wear; and which does not deform until 100°C in Celsius. The carrier for mineral concentrate can stably adhere the mineral concentrate thereto, and form an aggregate, and then the aggregate is put into a filling bed reactor or a deposition formation. The mineral concentrate is bled in a manner of dispersing the acidic solution containing a chemical substance or ecological substance. Then a solution of values which is permeated from the reactor or deposition, is collected for subsequent processing. Then, a solid residue is collected from the reactor or deposition. A cleaning carrier from which the mineral concentrate not having bled from the solid residue and possible deposit are separated, is reused. The carrier is reused for a cycle of new processing.SELECTED DRAWING: None
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