“Amid the brouhaha over Germany’s gold reserves at the Bundesbank, there’s another central bank using gold actively to bolster its currency and financial stability. The strategy looks the same – sitting on big stockpiles of the stuff. But the aim differs, because gold is much closer to the everyday financial system. Starting in October 2011, the central bank began allowing commercial banks to hold a portion of their ‘required reserves’ – needed to reassure depositors and other creditors they had plenty of money to hand – in physical gold bullion. Starting at 10%, that proportion was then raised to 30%.”
http://www.businessinsider.com/how-the-central-bank-of-turkey-uses-gold-2013-1