>>719958483
To be fair once we get space mining gold becomes only slightly expensive and is priced in along with something like some particular hard-to-make common steel alloy instead of something worth thousands an ounce.
We COULD mine it extremely easy if we were space mining because there's no environmental damage, we can manufacture 10 billion tons of chemicals and pile all of the gold ore into a big steel tub - basically a giant leech field - and then just dump the shit byproducts on saturn or some other gravity well where they're contained. No EPA makes mining instantly 1,000 times cheaper.
This also makes trash planets extremely viable and even likely in the future, we'll have entire planets where we basically just drop irradiated materials and chemicals and stuff.
>>719958669
We already are fairly close to having it though, we could certainly do small-scale asteroid mining right now if we wanted to. It's not profitable right now, but very well could be with some minor changes / improvements.
It's more about just waiting right now, we have all of the theoretical small-scale technology but we don't have space factories or anything yet, and there doesn't seem to be a great push to do space mining.