Right, well I have no Idea (in theory) where this place is, BUT I am staying in a villa just a few Km's to the north of my suspected site.
I think we can establish the following :-
1) It is somewhere between ES Cubells and Cala D'Hort
2) It is the site of a disused quarry where previously the sandstone blocks were removed for the construction of the fortress in Ibiza.
Right I don't think that is too specific, but my own personal idea is that it must therefore be
a) Partially visible from the cliff-top
b) Probably visible if you are cruising by on a boat.
Now I might be wrong here, but there is an important place that you need to get to before you are almost directly above the small beach - now I think I know what this place is called but didn't want to name it here and blow the 'secret' (or I might be completely wrong).
Right I may be right or I may be wrong, I have a more detailed plan than this but I didn't want to mention it at this point. For those of you that know where it is - please confirm if I am on the right lines, otherwise I will continue to add detail until someone can confirm or deny what I am on about