Since it's an almost free byproduct of copper electrorefining (>1% concentration in copper anode slime, but low annual production of ~800 tons, limiting CdTe panel production to ~100GW/year short term [1]), I don't think that mining it in space is ever gonna pay off for terrestrial panel production, because if it was priced somewhat comparably to platinum group metals you could never ever justify any demand for it (panels would be much too expensive compared to alternatives, tellurium is already a relevant cost factor for them despite being cheap-ish) => and you'd obviously use all interplanetary mining/transport capability on platinum and its ilk instead.
[1]: https://www.pv-magazine.com/2026/02/10/global-cadmium-tellur...
The layer of CdTe on a thin film PV module is extremely thin, so at current prices the cost of Te is a very small fraction of the cost of the module.
People tend to have a completely inaccurate view on this because of bad popsci, out-of-context feasibility studies from the 1950s and fiction that just leans toward the "fantasy" on that.
The reasons for this is are very simple:
1) There is no "high ground". Being in orbit does not enable you to throw things "down" for free, thats simply not how orbital dynamics work. All the impact energy you have to pay for up front, and delta-v on some orbital object is almost inevitably more expensive than the equivalent amount of explosives on the ground.
2) Anything launched from beyond earth orbit would be unusably delayed. And telegraphed.
3) The concept does not have a single selling point from a military perspective; not really faster than an ICBM, penetration is limited by newtonian physics regardless of speed and more expensive than just delivering the equivalent amount of explosives (or nuclear payload) via missile.
edit: Yes an interplanetary transport system could be weaponized. But so could the explosives currently used in mining (~tens of millions of tons per year), no one cares.