Yeah -- been to Chile a couple of times. Great trip -- and thinking about going again next February.
Took tons of flies but in the end, primarily used streamers like the bigger sized wooly buggers, seal buggers, bow river buggers -- lots of buggers, a few articulated leech patterns but they are a pain as far as I am concerned. Also fished in a place where there were a lot of hoppers so take some hopper patterns, maybe some beetle patterns. Didn't fish many dries but some. Basically the same stuff that you would use here. Did not use the pancora crab pattern but I had them.
I almost forgot -- Chernobyl Ants also