Spaceship thrusters capable of being powered by any metal that can burn, such as iron, aluminum or copper

https://www.earth.com/news/spaceship-thruster-technology-fueled-by-any-type-of-metal-could-fly-indefinitely/

"silicate minerals like olivine and pyroxene also come in handy for spacecraft landing on a moon or comet rich in these burnable metals, where they extract what they need to refuel... ensures enough fuel for extended missions, for: (1) mining and returning to Earth with iron and nickel, precious metals like platinum, gold, silver, (2) future missions where deep-space travel isn’t restricted by the limited availability of fuel... titled: Super Magdrive system"