Plymouth based McCoig Materials has plans in 2014 to open up a sand and gravel extraction operation in Lyndon Township north of Chelsea.
http://www.mccoigmaterials.com/
There is an online petition drive to stop the project.
In the news
http://www.heritage.com/articles/2014/03/07/chelsea_standard/news/doc53165b18a7945214907828.txt
http://www.mlive.com/news/ann-arbor/index.ssf/2014/02/residents_turn_out_in_force_to.html
http://www.heritage.com/articles/2014/02/12/chelsea_standard/news/doc52fa9f877161f159598561.txt
http://wemu.org/post/proposed-gravel-pit-lyndon-township-subject-meeting-monday-night