Hiked while on Pct. Neat area. The mountain is limestone not marble but does have many caves on it.
Climbed Black Marble Mountain as a kid. It was a fantastic experience, with lady bugs that were swarming the top. It was quite snowy then, but still not a problem to reach the top.
What a nice area. Neat looking mountain with all the marble. Trail was full of horse crap!
Climbed the rim a few times. Have come up from Marble Valley as well as from the Sky High Lakes and PCT.
Spent a few days in the Marbles and did this as a day hike from the Sky High Lakes basin. Nice and sunny with great views. Nice sunburn from light colored marble. Thanks for the cool page.