Cascade Canyon - Lapis Lazuli - Mt. Baldy, CA
I had hiked Cascade Canyon (almost) to the Lapis mine when I lived on Mt Baldy. Got as far as the wild blackberry patch then had to turn around.
There are three waterfalls, between the lapis mine and Cascade Canyon. The waterfalls feed into Cascade Creek which feeds into San Antonio Creek, the primary water supply for the Ontario Dam.
Though I never made it to the mine proper, I was still able to collect some stones. Lapis continuously washes down Cascade Creek into San Antonio Creek. Excellent occurrences can be found in these waterways.