I really think that the mountain is just part of the Crazy Horse experience.
The museums and native american crafts along with native dancers made it for
me.

As far as the excavation of the mountain goes, I was there in June and I
didn't hear anything at the site or from the locals (and I had breakfast
with one of the family members carving the mountain) about "bad rock".
Maybe that happened after I left?

Anyway, there are still lots of things that you would enjoy in the Black
Hills even if you choose not to visit Crazy Horse.

Since it was brought up, let me express my opinion about Mount Rushmore.  It
is a place that I have wated to see all of my adult life.  Unfortunately,
while the mountain was impressive, the rest of the facility felt like a flea
market.

I say this only because it seemed to me that everything was geared to making
money.  From the "gift shop" which by the way was twice the size of the
museum area documenting the construction of the mountain, to the "food
court" hawking more variety than you would find in your local mall.

I would have rather paid an entrance fee (you now only pay for parking) than
to see this great american monument prostituted in this way.

Just my opinion.

Dave