I don’t know if you are wanting to use real coins or to generate them in a computer. What I would do is create a small set with a flat (as in not glossy) black background (ie: some black felt or fabric). With this “set” well lit, I would then drop many real coins onto the background, one at a time (ie: drop one coin, let it sit, pick up the coin, repeat).
Then in after effects, I would bring in the footage, and apply a luma key to key out the darker (the black bg), so that I could cut out any grain if there was any in the video footage, making it pure black. I would composite all of those coins on top of eachother, positioning them so that they would fall where I wanted them (looking at the end of each piece of footage to see where they will end up) in order to get it to spell out the word “silver.”
You could probably film the coin just 10 times or so, and that would be enough variation that no one would notice if you repeat the same drop a few of times.
This is the way I would do it. I am sure some people could come up with a faster way to CG it, but I personally prefer the look of real things vs. computer generated things wherever possible. If it is something like a logo, it is going to be used a lot, so you want to make it worth your while.