Black Hills Institute of Geological Research

The Black Hills Institute of Geological Research, Inc. is a private corporation specializing in the excavation and preparation of fossils, as well as the sale of both original fossil material and museum-quality replicas. Founded in 1974 and based in Hill City, South Dakota, the company is most famous for excavating and selling replicas of some of the most complete specimens of Tyrannosaurus rex, including "Sue", "Stan" and "Trix".

In March 1992, BHI owners founded the Black Hills Museum of Natural History in Hill City, a non-profit paleontological museum which is controlled by an independent Board of Directors.