I've always thought that, with his ability to scale walls, Gollum could have crawled out of one of the light shafts we are told are present in the larger halls. This would have brought him out onto the mountain side.
If the movie image of orcs scaling pillars is correct, they could also have used this method. However, I feel that the orcs would have found a way to bridge the gap.
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High Lord Kharank has spoken
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