First off. Metal is NOT infinite. Every mine owner ever has known that, at some point, he will have to abandon the mine and move on, because it will run out of available ore.
Second, no one mines Volcanos, save for the one mine I saw on google trying to find someone who DID mine volcanos, and they're mining for sulfur, not metal. Mining magma for resources is beyond our current technology, and dwarves, hardy miners that they are, can't come close to acheiving what we can in real life, so they would not mine Volcanos. Period. (Perhaps MAGIC could be brought to achieve such a thing, buts thats a whole different discussion).
Third,
quote:
You're not supposed to have a forever-alive fortress. Sad but true. The fortress gameplay is intended to have a clear beginning, a middle, and an end, and if you want to keep mining increasingly precious metals you are supposed to be forced into that ending eventually.
I agree that fortress gameplay is supposed to have a beginning, middle and end. However, when a fortress begins running out of metals, it doesn't just die. There is a reason this is called a 'fortress' and not a 'mine'. Mines just exist to extract metals and resources from the ground for use by others. A Fortress in this game is actually a City and a mine combined. Cities don't like to disappear, so once the mine portion dries up, the fortress would instead start to import useful metals and perhaps even rare stones and gems if need be, in order to survive.
But since the fortress gameplay needs to end eventually the final goal should be to gain all the important nobles so that your fortress turns in the the capital of your own kingdom (or a whole new dwarf "civilization", in this case), where you can start your own satallite fortresses and import resources from them. At this point, you could leave your kingdom, and it would become an fully interactable dwarf civilization just like any other already on the game map. (This is essentially what all those duchy/county/kingdom plans are on the development page)
So yes, you should eventually run out of native resources, yes you should be able to acquire new resources at that point(trade/import), no your fortress shouldn't just die, and yes gameplay needs to have an ending point.
[ October 15, 2006: Message edited by: Wahnsinniger ]