The funny thing about this site is how polarizing it is. The EPA claims victory in cleaning up the mines, but geologists point out that tectonic activity and erosion liberate and transport millions of cubic yards of asbestos. The BLM says the area is closed, but motorcycle clubs still trespass. Some people say that the local asbestos isn't dangerous because it's fluffier/shorter/longer/curlier than others that are dangerous. Rural people say the closure is a coastal, liberal conspiracy. Complete opposite opinions are expressed in apparently respectable peer-reviewed scientific journals.
I don't know what to believe. Maybe the rednecks are right, it's a perfectly good place to tear it up on your dirt bike. Or maybe it's insanely dangerous, and the uncertainty is caused by industry disinformation campaigns. Who knows.