951 Gaspra is a rocky S type asteroid made famous by being studied by the Galileo probe in the 1990s, in fact the first ever to be studied up close by a probe.
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 80.
Image Credit: NASA / JPL-Caltech