They could mine copper and silver, but not iron. Was there a reason to not use such materials to build advanced mining tools to work with Iron? What was their main limitation? Couldn't they build something like a big Tumi but... pike-shaped as a tool suitable for mining iron?
Edit: Tumi is a parallel of any sharp tool, e.g. knives. They had pretty good primitive metallurgy to develop that, to the extent of even using them as currency in pacific sea regions. So my question is what was their limitation to work with iron.
Edit 2: In particular when bronze and copper were used to non-religious purposes (to this extent, Iron could have been used as well, but was not the case).
Edit 3: I fixed the question title a bit since stuff about former civilizations was wrong, and being wrong is what makes me ask even more this question.
The claim is from wikipedia.