You don't need to be actually mining the stuff for it to be considered a reserve, at least in the Canadian (CIM) definitions. You do need at least a pre-feasibility study, and details on market prices & contracts.
The general point is right though, "mineral resources" means there's metal in the ground, "mineral reserves" means there's metal in the ground that can be economically mined, with consideration of the mining methods, infrastructure, legal title, environmental impact, metallurgy, market contracts, etc.
If the fundamentals of international resource extraction changes (which because of the increase in wages and living standards and expectations in China is happening) then we might see wide spread and rapid mining happening in the US. My questions in that scenario are 1) who will work these mines? The US is running at very high employment right now, and mining is very hard work 2) where would our ore refinement equipment and skills come from? China has 50 years of ore refinement development behind them. They have infrastructure to BUILD the infrastructure for ore extraction and refinement. My understanding is that they're uninterested in selling that currently 3) then all the other local issues like where will they be able to sell locals on building giant mines, dealing with the heavy traffic, potential environmental concerns, etc.
> China has 50 years of ore refinement development behind them.
No it doesn't (at best its about 35 years) and it often (mostly) uses equipment made in the west. In fact, if you want to extract something from the earth, its very likely you need a US firm to help you do it (depends on how hard the material is to extract).
> and ecological collapse
You can do mining responsibly, it just costs more. US firms about 20 years ago tried to get the US government to subsidize their industries to compensate for the extra costs. The politicians said no and voiced environmental concerns. So those materials started coming from China and the 3rd world where they were extracted using even dirtier methods than the US was using at the time. It turns out that pollution doesn't obey international borders though.
Finally, most of the material China exports is raw and its refined somewhere else. The only things China refines for themselves are either a) is easy and they need them domestically or b) the refining process is very dirty. Additionally, mining almost always takes place far from population centers. The basic reason for this is that all the material near population centers was extracted far in the past. Your entire take has little to no resemblance with reality.
>almost always takes place far from population centers
No in PRC case, they literally build population centers to service mining, part of third front strategy in 60s to move mining into rugged interior to protect against US/USSR. If you want to mine/process at PRC scale, you need to plop a few million people in large urban complexes i.e. boutou has 3 million people, they're not 5000 people mining towns.
It's amazing how many people think China bootstrapped its industry from first principals when all it did was lure western companies to move their production over and "learned" by copying.
There's a reason western M/HREE (i.e. the strategic good stuff) strategy hedges on similar iconic clays finds like PRC, because that's the only working industrial chain that extracts M/HREEs at scale. It's why AU/Lynas focus on ionic clays and not US hardrock... which btw doesn't even pretend it will do anything meaningful for mineral security other than light REE.
US+co is trying to replicate PRC M/HREE industry, without the techstack that took PRC decades to build out, because US+co never developed these geologies in the first place. The relevant upstream extraction/mmidstream refining tech for kind of deposits was never pursued in the west.
Now west can move fast due to second mover advantage, but it's going to be slow going like PRC EUV. Until then it's going to require all sorts of parallel efforts like recycling, or materials engineering to reduce M/HREEs to mitigate gap.