Minnesota Power - Minntac 230kV Ring Bus Addition: Mountain Iron, MN



U.S. SiteWork, Inc. was selected as the earthwork, underground, and drilled pier contractor on the 230 kV Ring Bus Addition to the Minntac Substation on Minnesota Power’s Taconite Ridge inside US Steel’s Minntac Mine.

U.S. SiteWork, Inc. performed deep foundation drilling for 45 EA) drilled piers ranging from 36” to 60” diameter, cored into bedrock.

Site improvements included excavation/backfill for new breaker mat foundations, new site roads, over 1000 LF of site drain tile, and import/place over 4000 Ton of 1-1/2” crushed rock surfacing.


Year Completed: 2016

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