Founded in 1935, Mulzer Crushed Stone Inc. delivers crushed stone sand and gravel for the construction of highways, commercial construction and residential buildings. Based in Evansville, Ind., the company is one of the leading suppliers of high-calcium limestone for flue-gas desulfurization in the Ohio Valley. It also produces derrick stone, rip-rap and high calcium limestone for power plant desulfurization equipment. Mulzer Crushed Stone Inc. caters to various areas, including Indiana, Kentucky, Illinois and West Virginia. It has received the approval for use on Federal Corps of Engineers projects.