On this link there is a photo of Piedra del Cocuy. Is difficult to say 
where is exactly the tripoint. It seems to be a wet one or placed on a 
island named San José.
http://communities.msn.es/ConlaNaturaleza/
venezuelaparaestacomunidad.msnw?action=ShowPhoto&PhotoID=34
 No news about a tripoint monument, but there are at least a
binational monument there, according to
http://home.hetnet.nl/~chimera15/yanomami/yanomami2.html
 There is more information about the tripoint at "Fronteiras do Brasil":
http://www.info.lncc.br/wrmkkk/venezuee.html
Marcel
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