Welcome to

Triangle Fraternity

South Dakota Mines

Est. 1930

Engineers | Architects | Scientists

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New Chapter House Campaign

The purpose of Triangle shall be to maintain a fraternity of engineers, architects, and scientists. It shall carry out its purpose by establishing chapters that develop balanced men who cultivate high moral character, foster lifelong friendships, and live their lives with integrity.

Triangle Fraternity has been on the campus of SD Mines for almost 100 years. We develop students into not only graduates, but into leaders, stewards, and Brothers. We take pride in our experiences on campus and in our community in the Black Hills. We welcome you to join us.

Actives

Group of actives enjoying M-Day

Want to know more about what the students are up to? Click above to see what’s happening at SD Mines Triangle.

Alumni

Group of SDM Triangle Alumni from Reunion 2025

Click above to check out the latest happenings our Alumni are working on

Lines from the Mines

A newsletter titled 'Lines from the Mines' from Spring 2026 by the SD Mines Triangle Fraternity.

Check out the latest and past Lines from the Mines

Chapter Home

SDM Chapter House

Click here to see the recent milestones of our new Chapter Home development

Social Media