Powerhouse Museum

at Missouri Mines State Historic Site

a kid sitting on a piece of the  old mining equipmentAccessible Symbol


Tour the 19,000-square-foot Powerhouse, built in 1907 and renovated in the 1980s, which is under development as a Missouri mining history and mineral resources museum. While the museum is certainly a work in progress, three galleries are currently open to visitors. Click here for tour fees.

The Mining Equipment Gallery

The first of three galleries contains underground mining equipment used at various times throughout the long history of the Old Lead Belt. Equipment on display ranges from a small 1-ton ore car -- a relic from the days of hand loading -- to a massive 15-ton electric trolley locomotive -- for years the workhorse of underground mainline haulage.

Most important is a rare St. Joe shovel, essentially a mechanical loader on crawler tracks. The shovel was designed by the St. Joseph Lead Company and engineered to the specific underground conditions in the Old Lead Belt. Only 52 were made, the first about 1922. Another visitor favorite is the speeder, a small man-carrier that provided fast and convenient underground transportation for professional staff and maintenance personnel.

Near the southwest corner of this gallery is a small display of the most important ore minerals -- galena, sphalerite and chalcopyrite -- from the mines in the Southeast Missouri Lead District.

The Mineral Gallery

a man looking at some of  the minerals on displayThe second museum gallery includes exhibits on Missouri geology and mineral resources, and features an outstanding mineral collection. The gallery boasts 27 large cases of mineral specimens, designed not only to showcase the many spectacular crystals, but also to educate. About 1,100 specimens from worldwide localities are on display. Sixteen of the cases are antique display cabinets, custom made in the 1920s for the Missouri State Museum inside the Capitol. The elegant massive hardwood cases, now renovated with modern light boxes, fit well within the old powerhouse interior.

Six double-sided cases house the museum's systematic mineral collection, an excellent learning exhibit that includes some notable old samples from classic localities. Seven other large cases are devoted to common mineral species or mineral groups, including quartz, calcite, barite, iron oxides, and copper minerals. The fluorescent mineral room -- featuring mineral specimens that "glow" with brilliant colors under ultraviolet "blacklight" -- is a favorite with children. Also popular is the lapidary exhibit: a partially backlighted display showcasing transparent mineral specimens, colorful agate varieties and semiprecious gemstones.

The heart of the mineral collection was originally assembled and owned by Fayette P. Graves, a local mining company executive. Graves began collecting as a young man in 1866, and by the turn of the century had assembled what was undoubtedly the finest mineral collection in Missouri -- about 3,000 well-chosen specimens from all over the world. Minerals were self-collected from the local lead mines, purchased from prominent dealers of the day, and traded from other collectors and museums. For years, the Graves' collection was shown in a small company-owned museum in the town of Doe Run. About 1912, the St. Joseph Lead Company assumed legal ownership of the collection and in 1923 donated it to the state of Missouri.

The balance of the Missouri Mines mineral gallery is devoted to basic teaching exhibits. Educational displays depict the physical properties of minerals, crystallography and the environments of mineral formation. Regional exhibits illustrate the geology of Missouri and characteristic rock types, mineral resources of Missouri and typical ore samples, Keokuk-type geodes from northeastern Missouri and igneous rocks of the St. Francois Mountains. Visiting collectors find the Missouri's Own case especially interesting. It contains good examples of the official state rock and mineral -- mozarkite and galena. Also featured are typical specimens of other minerals that can be collected in the "Show-Me" state: drusy quartz, Missouri lace agate, bladed barite, limonite and geodes.

A small theater or orientation room at the south side of the mineral gallery is used to show a 12-minute video depicting historic underground mining and ore milling in the Old Lead Belt. The mineral gallery also houses a museum shop, where related books, mineral and fossil samples, mineral jewelry, rockhound equipment, and souvenirs may be purchased.

Powerhouse Equipment Gallery

The third and largest museum gallery features the historic in-place powerhouse machinery that operated from the early 1930s until the mine-mill shut down in 1972. This gallery retains much of its original character. Dominating the west end of the 35-foot-high room are two large Chicago Pneumatic Tool Company electric-powered air compressors, built about 1930, that supplied air power underground to run the pneumatic drills and other mining equipment. The large gallery also sports a massive 65-foot-long overhead bridge crane supporting a large chain hoist. The original 1907 hand-powered crane-hoist is still operational: gears, pulleys and chains work together to lift and move objects as heavy as 25,000 pounds.

Future Development

Development of the historic site's museum is far from complete: in fact, less than half of the planned exhibits are currently in place. While the museum will always feature the mining history and mineral resources of the southeast Missouri lead district, the site's conceptual development plan dictates that all important aspects of Missouri's diverse mining past be addressed. Some future exhibits will focus on zinc mining in the Joplin district, iron and barite mining, coal mining in northern and western Missouri, stone quarrying, cement and lime manufacturing, and the refractory and structural clay industries. Social themes such as life in the mining community, company housing, the company store system, labor unions, and health and safety issues will also be addressed.

Lastly, the mineral gallery will be expanded to include a Hall of Missouri Minerals. Twenty or more display units will showcase a definitive collection of the state's minerals, arranged according to mining district and geologic occurrence. Exhibit development is expected to be a long-term project, requiring a number of years. This Web page will be kept up-to-date with announcements of any significant museum additions or changes. 

Park Hours


37.837778, -90.508611

Park Hours

For temporary closures related to weather, stewardship activities and maintenance, visit our Park and Site Status Map.

Social distancing of 6 feet will be encouraged of visitors. Face coverings will be utilized by staff and encouraged of visitors. The museum will be open only to individuals, families and small groups (of 20 or fewer) with regular tour admission charges (cash, checks or credit).

Regular Hours

Summer Hours (On-Season)

  • April through October
    10 a.m. to 4 p.m., Monday through Saturday
    Noon to 6 p.m., Sunday

Winter Hours (Off-Season)

  • November
    10 a.m. to 4 p.m., Monday through Saturday
    Noon to 5 p.m., Sunday
  • December through March
    10 a.m. to 4 p.m., Friday and Saturday
    Noon to 5 p.m., Sunday

Groups (15+ people) can schedule tours in advance for any day of the week.

The historic site is closed New Year's, Easter, Thanksgiving and Christmas days.