Yes for birds over 6-8ish weeks or so, my grit is in a separate container. The reasons I don't do that for chicks is 1) they use a different size than the adults, so I don't want to mix tiny grit with big grit, where it can get lost (if the chicks can even reach the adult's container) and 2) very rarely, chicks become obsessed with grit and can overeat it, so by sprinkling a small amount on their feed, it guarantees they can't eat too much of it.
That works as long as you have a variety of gravel/rock sizes, including small bits appropriate for chicks.