Harvestable space POIs shouldn't have a cooldown

[hydragyro]

The long-term availability of resources from harvestable space POIs is limited by their refill rate, which makes them similar to geysers while being much more difficult to access. I suggest removing the "mass" and "refill rate" variables from mineable space POIs, to make it possible to always obtain the resources at the full rate the rocket(s) can mine them. Alternatively, the masses could be raised substantially, to at least ten times what they are now, which would yield a similar effect with an even smaller change. That might sound like a lot, but in most cases the "maximum mass" would still represent less than the amount of any given resource available on whichever asteroid that resource is typically found on, which shows just how limited the harvestable space POIs are in their current state.
I tend to reach a point in the mid-to-late-game where my base is stable, geysers are tamed, rockets are flying, and I'm ready to start some crazy mega-project... just as soon as those volcanoes cough up enough metal, or mineral, or whatever. The same thing can happen with harvestable space POIs. So, my reward for overcoming the major hurdles of the game is that I have to let the game run idle to accumulate enough rate-limited resources before I can move on to the really interesting projects. I see the next update will buff geyser output, and space mining needs something similar. Most geysers can be tamed as soon as steam turbines are available, and some even before that point, but a reliable space-mining operation requires unlocking most of the research tree and the ability to mass-produce diamond and rocket fuel, which makes it firmly a late-game activity. There are no resources that can be obtained only from space POIs (aside from artifacts), they just make common resources available indefinitely. However, the rate at which they're replenished is often low enough that it's very possible to run out of a resource while the mining point refills. Again, that's similar to how geysers are, but resources can be obtained from geysers more readily than from space mining, so while geysers should have such a limitation, space mining, arguably, shouldn't. By the time a player has the access to space mining, they've already survived hundreds of cycles and likely have the ability to complete all major game objectives, if they haven't already; the game has essentially been "won" at that point and so I wouldn't expect this change to have a major effect on balance or progression. It's just a simple way to add more possibilities to the late game, which is something that's lacking at this stage of development.
If the mass and refill rate variables were removed from Space POIs, or the masses increased substantially, without changing anything else, space mining would still be limited by diamond production, rocket fuel production, the rate at which the drillcone can mine, and the hard limit of 16 rocket command modules per save. Thus a player still wouldn't be able obtain truly unlimited resources from them, however, they would be able acquire a larger quantity of a particular resource by sending a number of rockets to the same POI. That would at least give the player and the duplicants something to do rather than just waiting dozens of cycles or more for the POI to refill, and make it possible to stockpile an arbitrary amount of those resources to avoid having to wait entirely. It would also allow for some interesting new late-game concepts: ice from space could become a viable source of water or cooling, carbon dioxide from space could be converted into useful quantities petroleum, rust deoxidizers and oxygen diffusers could finally compete with electrolysers for late-game oxygen production, etc.
P.S: Love the game, the only thing I've played more is Don't Starve

[meekay]

Tangent: the one useful resource that seems to have no renewable source at all is Granite.
Gold Amalgam is also unavailable from the map but does occasionally come out of the printer in 2000kg increments.

[hydragyro]

Ceramic can be used in place of granite if you want a raw mineral with high hardness and high decor, the main difference is that granite has high thermal conductivity and a low melting point, where ceramic has a high melting point and a low thermal conductivity. The only exception is the marble block, which requires granite or obsidian, and while obsidian is renewable from space, it doesn't have a decor bonus. I know granite is sometimes used in pipes or tiles for its thermal conductivity, but of course any metal is better for that.
Niobium can be used in place of gold amalgam in all applications, with an even higher decor and overheat bonus, and refined gold is renewable from gold volcanoes and the gilded asteroid field, which I believe is guaranteed on all maps (because it's also the source of fullerene).
There are only a few things in the game that are both nonrenewable and have no good substitutes, like lead (required for lead suits) and abyssalite (required for insulation).