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Green Tier Participant
to become a Green Tier participant.
Public comment periods

Public comment opportunities are available for the following applicants.

  • C.A. Lawton - Tier 2
  • InPro World Headquarters - Tier 2
DNR contact
Dan Helsel
910 Highway 54 E
Black River Falls WI 54615
Cell 715-797-8601
Fax 715-284-1737
Company contact
Jeremy Niemeier
Senior environmental specialist
20319 State Hwy 21
Tomah WI 54660
Fax 608-372-4765
Covia Holdings Corporation [exit DNR]

Covia Holdings Corporation Functionally Equivalent to ISO 14001 Tier 1 participant since 2/24/2014

Covia Holdings Corporation* is located near Tomah in west central Wisconsin. This facility mines non-metallic minerals utilizing open pit quarrying to produce industrial sand. Covia has other locations throughout the United States, Canada and Mexico. The company is a member of the Wisconsin Industrial Sand Association, an organization that requires Green Tier enrollment.

Environmental activities

Covia plans to incorporate “state-of-the-art technologies” to minimize water and energy consumption, utilize process and design controls to help minimize impacts to the surrounding environment and will work to re-establish pine barren habitat, oak savannah habitat and native prairie plants to the landscape. The company is also a DNR Habitat Conservation Partner for the Karner Blue Butterfly and will help re-establish a bat hibernaculum as a partner in DNR’s Bat Habitat Program.


Acceptance letter


*formerly Unimin Corporation’s Tunnel City facility

Last revised: Wednesday December 04 2019