1) More Demands : The population increase, we produce new technology that need those resources, etc. Even if you can mine 10 times more stuff than 100 years ago, if you have 11 times more demand than in the past, the price will probably go up.
2) Sometime we run out of easily accessible sources and we then need to use more expensive method to get to new sources of that material. For example, oil that isn’t too deep was mostly all pump out. Now we mostly need to make expensive deep drilling or drill in the Ocean. Stuff that is a lot harder to do.
3) More regulations from government. In the past you could just have an open mine not too far away from a population center. This could create a lot of issues for the community, dust, explosion create loud sound and vibration, infiltration of dangerous matter into the soil, maybe up to the water source, etc. Being a miner is also very dangerous and regulation were created to make their job safer. All of this increase the price, now is that a good or a bad things will depend on who you ask.
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