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Private company

Black Hills Institute of Geological Research, Inc.

Logo: bhigr.com3

Geological research company in South Dakota, United States

The Black Hills Institute of Geological Research, Inc. (BHI) 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".2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

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Stan -T.rex fossill and MOR555 - cast by Volkan Yuksel DSC06441
Photo: Volkan Yuksel, CC BY-SA 3.0, via Wikimedia Commons4

The Black Hills Institute of Geological Research, Inc. (BHI) 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".2

Sources

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