I think this must be just a joke. I bet there isn't any gold.
6 seconds sound clip from the Game of Killers (1978) movie soundboard.
You can hear this line at 01:20:26 in the DVD version of the movie.
Quote context
[...]
- We weren't too happy leaving the map and all that gold.
- So we decided we'd better come back.
- According to the map, the gold must be somewhere around here. But still, where would it...?
- To the sky sword by sand dunes. That means this pillar, I'm sure.
- But this one... 'A long treasure will be seen'. What's that mean?
- Got it! The gold has to be under that shadow!
- 'A long treasure will be seen'. Ah, that's it. Come on, let's go!
- I think this must be just a joke. I bet there isn't any gold.
- I'm allergic to gold. I know it must be here, come on!
- Goddammit! We're just fools. There isn't any gold here!
- So the gold's under the pillar. That's a very clever way to hide the gold.
[...]