which gold co will have best percent gain

Its hard not to think Gold is looking exciting. But which gold company will give the best percentage gain if say gold hits 850 dollars.
A few weeks ago I would of said IGR without much doubt but recently it has risen 50 percent. But there still is huge upside as it nears production and with further drilling results over coming months.
Larger companies such as DOM will have to rise several dollars for 50 or even 100 percent return. IGR only has to rise 25 cents for a 100 persent gain.
It could be a very interesting 12 months from hereon for Gold companies
So which will present the highest gain and why.