Pebble Island Lodge has the following. It might be a lead for the positive identification of the Dagger wreckage?
http://www.pebblelodge.com/history.htm
'Argentine aircraft: North-east of First Mountain there are two crash sites with the scattered wreckage of Argentine Daggers. These multi-role fighter/bombers were both shot down by Royal Navy Sea Harriers in May 1982. Further to the west near Marble Mountain, a memorial commemorates 5 Argentine airmen whose Learjet crashed in the area after it was shot down by H.M.S. Exeter on 7 June 1982.'
http://www.pebblelodge.com/contact.htm