In our second play tonight, we had an encounter card with two icons and another with 3. I added the two corresponding resource tokens to the encounter location on the former and three tokens on the latter. When the player went to that encounter location she got all 2 or 3 tokens.
I couldn't find any mention of this situation in the rule book (although I swear I did see something somewhere...). So I was just looking for confirmation we played it right. thanks!