What is the ruling on the Amanah loan from the British Bank in Dubai, which is a system of authorizing the bank to buy and sell copper or metal commodities, whereby the person takes an amount and repays it for more than its value through the Islamic Murabaha system, with a Sharia committee for the bank stating the permissibility and legitimacy of this transaction?

The permissibility or prohibition of the transaction cannot be definitively determined without knowing its true nature. If the bank buys the metal, takes possession of it, and then sells it in installments, there is no objection to that. However, if the transaction is a loan with interest without actual buying and selling, then it is prohibited usury (riba). Assuming the transaction is permissible, dealing with a usurious bank in this matter is subject to certain conditions.