PUBLIC LAW 87-456-MAY 24, 1962 satisfactory bond, be designated a bonded smelting or refining warehouse. Metal-bearing materials may be entered into a bonded smelting or refining warehouse without the payment of duties thereon and there smelted or refined, or both, together with metal-bearing materials of domestic or foreign origin. Upon arrival of imported metalbearing materials at the warehouse they shall be sampled according to commercial methods and assayed, both under customs supervision. The bond shall be charged with a sum equal in amount to the duties which would be payable on such metal-bearing materials in their condition as imported if entered for consumption, and the bond charge shall be adjusted to reflect changes in the applicable rate of duty occurring while the imported materials are still covered by the bond. " (b) The several charges against such bond may be canceled in whole or in part— " (1) upon the exportation from the bonded warehouses which treated the metal-bearing materials, or from any other bonded smelting or refining warehouse, of a quantity of the same kind of metal contained in any product of smelting or refining of metalbearing materials equal to the dutiable quantity contained in the imported metal-bearing materials less wastage provided for in subsection (c), or " (2) upon payment of duties on the dutiable quantity of metal contained in the imported metal-bearing materials, or "(3) upon the transfer of the bond charges to another bonded smelting or refining warehouse by physical shipment of a quantity of the same kind of metal contained in any product of smelting or refining of metal-bearing materials equal to the dutiable quantity contained in the imported metal-bearing materials less wastage provided for in subsection (c), or " (4) upon the transfer of the bond charges to a bonded customs warehouse other than a bonded smelting or refining warehouse by physical shipment of a quantity of the same kind of metal contained in any product of smelting or refining equal to the dutiable quantity contained in the imported metal-bearing materials less wastage provided for in subsection (c), and upon withdrawal from such other warehouse for exportation or domestic consumption the provisions of this section shall apply, or "(5) upon the transfer to another bonded smelting or refining warehouse without physical shipment of metal of bond charges representing a quantity of dutiable metal contained in imported metal-bearing materials less wastage provided for in subsection (c) of the plant of initial treatment of such materials provided there is on hand at the warehouse to which the transfer is made sufficient like metal in any form to satisfy the transferred bond charges. "(c) For purposes of paragraphs (1), (3), (4), and (5) of subsection (b), due allowances shall be made for wastage of metals other than copper, lead, and zinc, as ascertained from time to time by the Secretary of the Treasury. " (d) Upon the exportation of a product of smelting or refining other than refined metal the bond shall be credited with a quantity of metal equivalent to the quantity of metal contained in the product exported less the proportionate part of the deductions allowed for losses in determination of the bond charge being cancelled that would not ordinarily be sustained in production of the specific product exported as ascertained from time to time by the Secretary of the Treasury. "(e) Two or more smelting or refining warehouses may be included under one general bond and the quantities of each kind of metal sub-
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