We do it and have had a lot of success with it. I take a chef's knife and chop it up, much the way you would chop fresh herbs. Then we slightly color the resin (we like white mica pearl, a lot)
We thin the resin in the ultra sonic cleaner, but add the chopped gold leaf directly to the mold as we pour. This is one of the few PR blanks that we also use the pressure pot.
If you choose not to chop the gold leaf, it IS a prettier blank, but the odds of chipping out are much greater. Chip outs repair and look just fine when filled with thick CA.
I hope this helps.