Years after initial space-mining ventures went bust, startup AstroForge has announced two missions in 2023 to obtain rare-earth minerals from a near-Earth asteroid.
Rare earths, from an asteroid? Given that concentrates are worth, hmm, a few thousand $ a tonne, seems like a remarkably expensive method of getting them.
The platinum-group metals (PGMs) — iridium, osmium, palladium, platinum, rhodium, and ruthenium — which are among the rarest mineral commodities in Earth’s crust. Just 30 tonnes of rhodium, used in catalytic converters, are mined every year, and only three tonnes of iridium. Mostly these minerals come from mines in South Africa, Siberia, with some mines in the U.S. and Canada.
That’s not a good start to a sciencey, science discussion now is it? Platinum group metals are not rare earths, rare earths are not platinum group metals. Sigh.
“The appeal of asteroid mining is elements that are rare in the Earth’s crust may be found near the surface of some asteroids, where they could be relatively easy to access,” says Michael Brown (Monash University). “But developing the technology to robotically and effectively mine tons of raw material from distant asteroids won’t be easy.”
AstroForge plans to start small, literally, with its first CubeSat the size of two loaves of bread. Its first mission will test in-situ refining in a zero-gravity environment. “That’s really the piece that we see as the highest risk because it’s unproven technology in space,” says Acain. “So we’re launching a CubeSat up to low Earth orbit to understand and characterize our refinery in those harsh environments.”
Sounds feasible to me. Not that I actually know much about this but yes, iron rich asteroids are likely to have high nickel and so also pgm contents. You can refine them with a lot of ‘leccie – solar cells therefore. Why not?
The long-term plan is to have much larger spacecraft mine the surface of M-type asteroids and return to Earth only refined PGMs. It’s a big jump. “Scaling that up to return commercially viable quantities of processed material from asteroids millions of kilometers away is going to be difficult,” says Brown.
And that’s where the problem is.
“I hope the satellites are successful, but there are good reasons for caution,” said Brown. “The small satellites that will be flown in 2023 have masses of kilograms and budgets of millions, but commercial space mining missions would have masses of many tons and budgets of billions.”
Yes, a distinct problem.
AstroForge plans to take it milestone by milestone, but Acain thinks it’s an absolute necessity to extract these rare minerals off-Earth. “We have a finite supply of resources here on Earth – that’s a fact – and there’s more demand for these resources than ever before,” he says. The present mining process, he adds, is costly and polluting. “Taking it off-Earth is the only way we see to solve all of these issues.”
Maybe. But at what price? After all, we’re talking business here so price is an important consideration. Which brings us back to the opening line here:
Years after initial space-mining ventures went bust
As I wrote back then:
It’s also true that those nickel iron asteroids are likely to be rich in platinum-group metals (PGMs). They too can be refined with a bit of electricity, and they’re sufficiently valuable (say, for platinum, $60m a tonne, just as a number to use among friends) that we might be able to finance everything we’re trying to do by doing so.
OK.
Start from the size of the platinum market. This is some 6.2 million ounces a year. 6.5 million ounces of virgin material, that is: given the value of the metal some to all of past usage is recycled as well. At our $2,000 an ounce price guide, that gives us a market value of some $13bn a year. That certainly seems large enough to keep a space programme running. (Do note, I’m ignoring palladium, a similar sized market, and rhodium etc, which are much smaller ones. They don’t change the final conclusion by their inclusion or exclusion.)
Except that’s not quite how markets work. There are demand curves as well as supply ones: sure, a nice high price will encourage new entrants like Planetary into the market. But in order to shift all this new material, prices will have to decline. The important question therefore is how elastic is the market? How far, if at all, will the price fall if a new supplier enters?
From a recent trade report we’ve seen recently, an extra 250,000 ounces has come onto the market. This has led to a 25 per cent fall in the price of platinum. Ah! Price is very sensitive to an increase in supply, then. Or, if you prefer, demand is very insensitive to a change in price. They’re the same statement, really.
Ah. If you start bringing back platinum in sufficient volume to pay for the billions in satellite mining costs then you crash the price against your output of platinum.
Ooops! And the more you mine to cover your costs the lower the price received. For the price is to do with the rarity and if you’ve just gained another whole source then the rarity rather goes away, doesn’t it?
My opinion does not change therefore:
Guys, I wish you all the luck in this little blue marble of ours, but I do think this is best described as an adventure, not a business.
Spotter, VikingWill