NATCHEZ, Miss. — A Mississippi company that makes storage tanks and industrial pressure vessels is expanding.

Great River Industries in Natchez will add as many as 100 jobs to its current 180.

Economic developer Chandler Russ said Friday that the company has added additional customers. Great River will buy more equipment, but isn’t disclosing its investment.

Russ says Adams County plans to grant property tax breaks on new machinery, but isn’t saying how much those breaks will be worth. The company also makes ductwork and air quality control equipment for utilities and the energy industry.

Great River Industries, owned by NGS Investments, opened as Enersteel in 2010. The company has expanded at least three times since opening.

Local and state tax breaks worth more than $1 million were granted to a 2014 expansion.