486958 Arrokoth, aka Ultima Thule, a small C type asteroid of carbonaceous content and loaded with organics, is located in the Kuiper Belt. Arrokoth has a curious shape, and is obviously two asteroids that have somehow joined into one. Arrokoth was famously visited by the New Horizons probe to study this very unique asteroid.
A 10 square mile claim would be enough for basic mining operations and local support structure. Hypothetical estimated value in 2017 USD $1 trillion. The number of available claims is limited to 327.
Image Credit: NASA / JPL-Caltech