Every major city in Starfield has at least one store devoted to raw resources, and on Neon that store is called Mining League. However, on a world with no solid ground and no place to set an outpost, the store's owner has trouble attracting customers.
Starfield: Saburo's Solution Walkthrough
Saburo's Mining League isn't the most obvious shop on Neon, which is why he needs the player to help him advertise his shop.