The board of the Sweetwater Authority is interested in sand mining and material dredging opportunities in and around the South Bay water agency’s two reservoirs.

The agency, which serves National City, Bonita and parts of Chula Vista, plans to solicit interest from sand mining companies to explore the concept — specifically, whether there are opportunities to leverage the Sweetwater and Loveland reservoirs by extracting materials to not only create a revenue stream but also increase the capacity of the reservoirs.