If there is a structural weakness in the crust in this vicinity with many deep penetrating structures and a large intrusive body is at depth then it is possible that these features may be distantly related.  Clusters, as I understand are local features with several breccia pipes grouped closely together.  Without being on the ground and seeing the mineralogy of alteration and gangue minerals of the different deposits and measuring the age, it is impossible to connect them genetically from our vantage point.  I will post a photo of a cluster of diatremes in the photo section.

Here is a link to a USGS diagram of the development of a diatreme.

http://pubs.usgs.gov/circ/2004/1264/html/trip4/fig16.html

I don't know if Represa is a diatreme, I am just drawing connections from what data I can access trying to guess if there are sulfides at depth.  I also am just trying to evaluate the potential for additional discoveries.  The lake may well be man-made.  Only large features can be clearly viewed from Google images, the pixels are pretty big leaving us with only low resolution images of the Camino Rojo area.  I claim no special abilities or insight, just posting my view.  Not for investment advice.