4 Vesta is one of the greatest asteroids in the belt, coming in second only to mighty Ceres. The asteroid is so large in fact that they say its core has a differentiated interior, making the asteroid a protoplanet. The always appealing thing about such large bodies in the Main Belt is the near certitude of harboring valuable minerals. In fact it seems Vesta is far more rocky than water rich Ceres, so could easily be the most appealing target in the Main Belt. Making a claim on Vesta is a solid proposition.
A 10 square mile claim would be enough for basic mining operations and local support structure. Hypothetical estimated value in 2021 USD $1 trillion. The number of available claims is limited to 33,500.
Image Credit: NASA / JPL-Caltech