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Unfortunately we've pretty much used up all easily available resources. Anyone 'starting over' would have a much harder time getting the things they need to really get the ball rolling again.
When humans first discovered gold they practically only had to scoop it out of rivers. You'll be hard pressed to find any streams with such appreciable production anywhere in the world today.
I think that is thinking a bit too narrow. A lot of the stuff we use today might just be our bronze to our successors iron - you can build an unstable society on either. And what we do use up today could still work if used more efficiently - we might not have enough rare metals to give everyone a smartphone in the post-post-apocalypse, but I could see us still launching satellites if only big governments had computers - because they did.
We've already discovered fission and photocells. We're past the point of needing fossil fuels for a new civilization (or existing civilization). Fossil fuels are only hanging around for economic reasons.
Assuming that knowledge and resource locations are retained. Roman's had great concrete. Took a long time to reestablish what Humans already had and mixing raw materials is not complicated.
We need a Foundation project to restart society If we want to avoid this. Worst case solar cells becomes myth like Greek fire.