Is it permissible to work in a mint?
Question

                We know that working in a bank is haraam, but what is the ruling on working in the mint which prints the money for the banks – is that haraam too?.
Praise be to Allah.
    There is nothing wrong with working in the mint, and this 
    work has nothing to do with the transactions of the riba-based banks. The 
    people’s need for this currency is obvious to everyone, as it has become 
    essential to their lives. Production of this currency is connected to the 
    strength or weakness of the local economy, and the relationship between the 
    mint and the central bank is not one of transactions, rather it issues 
    orders to print a certain amount according to the fluctuations in the 
    foreign currency reserve and the economy. 

    And Allaah knows best.