returnable metal insur.

[regulus leo]

The insured value of goods under paragraphs A and B above shall, in cases where those goods are being converted treated or blended for the account of the Assured, be based on the total payable by the Assured to the Seller plus processing or similar costs, or on the returnable metal or other content (as applicable), plus 10%.
помогите перевести returnable metal, pls!