Lets deal with a smaller change in the price

The price you pay depends on the margin, which is related to how far away the settlement date is, but you can expect around 5% , so the minimum you could get into is 100 troy ounces, at todays price, times 5%. Since we're talking about 100 troy ounces, that means the margin required to buy the smallest sized future contract would be about the same as buying 5 ounces of gold. roughly $9K at current D3 Gold .

If you are working through a broker they will generally require you to sell or buy back the contract before the settlement date as they don't want to deal with actually following through on the purchase and having to take delivery of the Cheap RS Gold .

Lets deal with a smaller change in the price, to be a bit more realistic since we are talking typically about a settlement date that is 3 months out. And to make the math easy lets bump the price of gold to $2000/ounce. That means the price of a futures contract is going to be $10K Lets say the price goes up 10%, Well you have basically a 20:1 leverage since you only paid 5%, so you stand to gain $20,000.

Sounds great right? WRONG. because as good as the upside is, the downside is just as bad. If the price went down 10% you would be down $20000, which means you would not only have to cough up the 10K you committed but you would be expected to 'top up the margin' and throw in ANOTHER $10,000 as well. And if you can't pay that up your broker might close out your position for you.