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I caught a movie on SyF, back when it was still called The Sci-Fi Channel, ages ago.  Hell, I think it might have been when the channel was still pretty young.  Anyway, caught a flick back then and forgot the name of it.  It was about a couple guys and a woman searching for treasure in a mine shaft or cave.  Of course, it turns out not to be an easy task; the shaft was infested by some killer primordial ooze.  Things I remember about the movie:

-Black and white
-One of the guys winds up falling in the ooze and dying
-I don't think there was a very high death toll
-I seem to remember one scene where one of the characters is in a bar and a mariachi begins singing about the cave and possibly the lifeform living in it
-I remember scenes of the ooze coming out of the walls and running down it in cascades


Any ideas?

EDIT:
The movie is not Caltiki or The Stuff.  Of that I am certain.

Something Beneath (2007)? Only seen the Trailer on some Maneater Series DVD. Something Beneath is about slime and was shown on Sci-Fi http://www.imdb.com/title/tt0896040/

Not quite.  I think this movie came from the '50s or '60s.  It's a pretty old film.

If it was B&W, I am almost sure this has to be "The Unknown Terror" (1957).

I agree with Andrew-it even mentions the calypso singer and the song in this review from imdb-

I remember seeing this as a kid on local TV and being somewhat put out by the fact that you never got a clear look at the infected natives (probably for good reasons) and that the killer fungus monster at the finale was obviously tons of soap suds mixed in with a little dry ice fog. Oddly enough it stuck with me and soon I was putting shampoo in my hair and screaming "The fungus,the fungus!" Still,the leads all do a good straight faced job and the script doesn't contain the amount of Ed Wood style howlers you'd expect it to.As far as I know this is also the last horror film to present calypso singer Sir Lancelot who had appeared in the Val Lewton Films I walked with a Zombie and Curse Of The Cat People. The song "You Got To Suffer To Be Born Again is a mix of genius and absurdity. Highly recommended to anyone who likes old B movies.

Hmm... That almost sounds right, but I don't remember there being any fungal monsters.  After watching a clip on YouTube, the film also doesn't seem like the right one.  I might have to watch the whole movie, but I do remember the antagonist being a kind of slime or ooze.

I'm beginning to think Unknown Terror could be correct.  I just need to hear the song by Sir Lancelot that was in the film.

Unfortunately, I do not have a copy of it in my collection or I would help out.  It does seem almost impossible that there are two films like this.

Oh, for the fungus creatures - it's just men covered with thick soap suds.  Yes, really.

There might be a clip with music here (it's down the page a bit): http://monstermoviemusic.blogspot.ca/2007_10_01_archive.html  - (sorry if it isn't too helpful: I am on dialup and could not check it out.)