Mix on high for about 10-15 minutes. (At first it will look like whipped cream, then it will separate and look like little balls of butter - this is where the butter is separated from the milk)
Once it forms larger balls of butter turn off the mixer and scoop out the butter.
Place the butter into the bowl of ice water.
Squeeze the butter until it forms a nice, hard ball. Keep squeezing until the it doesn't give out any more buttermilk.
Take the ball of butter out of the ice water and into a new bowl. Salt to taste.
Recipe Notes
One quart of goat's milk cream should make 2 c. butter.