Could a collapsed industrial society ever build back up?

There’s a real constraint here, but “the resources are gone” is too strong. Some easy-to-reach, high-quality deposits have been mined, and getting materials from harder or lower-quality sources can take more energy and infrastructure. That raises the cost of rebuilding. It doesn’t mean every useful deposit has disappeared.

The bigger obstacle after a severe collapse might be losing the mines, power systems, transport, skilled workers, and specialized equipment needed to extract and process anything. A deposit underground isn’t much use if you can’t reach it or turn it into usable metal.

Rebuilding probably wouldn’t mean starting from sticks and stones. A lot of metal, machinery, buildings, and other materials would still be around to salvage. In some places, that could make repair and small-scale manufacturing possible long before anyone could reopen a complex modern supply chain.

But salvage is not a permanent substitute for mining and refining. A long-term recovery would still need energy, tools, technical knowledge, and some way to coordinate production. Keeping those capabilities alive matters at least as much as the remaining resource inventory.

I’d separate “another industrial revolution” from “a return to industrial production.” A full modern system depends on an enormous web of suppliers and precise processes. Recreating that from a badly damaged starting point could be extremely difficult, even if the raw materials were available.

That doesn’t prove recovery is impossible. It means the outcome would depend on how much infrastructure and knowledge survived, how connected communities remained, and whether they could produce reliable energy. The resource question is only one part of it.

There’s also a difference between finite resources and resources that are practically inaccessible with the tools you have. Lower-grade ore can still contain useful material, but extracting and processing it may require more energy and equipment. If energy is scarce, that can turn a technically available resource into an unusable one.

So I wouldn’t dismiss depletion, but I wouldn’t treat it as a hard geological switch where rebuilding becomes impossible. The concern is a pileup of limits: energy, infrastructure, labor, and access all failing at once.