Help with similar film

I have very recently seen Lust for Gold and there are elements in it that parallel another - possibly later and cheaper - film that I have tried to trace over the years. I remember seeing a film in around 1956 or 57 which could have been made earlier and I think it was shown as a second feature in which there was a search for the Braganza gold and various clues by way of a number of Braganza crosses that had to be found which would eventually lead to the treasure. The final one was found after a fight between the people searching - when one of them by accident sees his shadow fall on the point of the treasure across a small rocky valley - exactly as happens in Lust for Gold. On discovering the treasure they were attacked by Indians (or Incas - it could have been Inca treasure) who fired arrows from all directions - almost identical to the sequence in Lust for Gold.
Does anyone know of the film I mention. As I say it could have been Inca treasure that was being searched for.