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Gold futures' margin
The initial margin is $5940 and maintenance margin $5400.  A simple search of Comex Gold Margin gives the CME group site. You then need to specify CMX metals to see the margins.  Gold is currently about $1300. A gold future is 100 oz. So the full contract is worth $130K. You want to 'go long' so you enter into a contract for Dec '14. You put up $5940, and if gold rises, you gain $100 for each $1 it goes up. Likewise on the downside. If gold drops $5.40, you lost $540 and will get a call to end the position or to put up more money. It's similar to stock margin requirements, only the numbers are much lower, your leverage with futures is over 20 to 1.