Here are some videos of inside. As you can see, it opens up to a full-on mine that goes deep:
This mine is on the same trail as the Warlock mine. Visit that page to see more visuals on the steps to finding these mines.
Keep your eyes peeled for a little tunnel up on the hill to your right:
This is a tiny, tiny entrance:
That's way too sketchy for me to enter. This does not appear to be a safe entrance even if it does open up to a sturdy mine inside. The entrance literally looks like it is ready to collapse and judging from the inside, part of it already HAS! Don't go in. You could make headlines....just saying!
Anza Borrego Desert
LHOOQ/EXREALISM Vintage Bookstore