HAGERSTOWN, Maryland (Oct. 10, 2023) – SGI, a Standard Industries company and manufacturer of innovative roofing products, building materials, and agricultural products, today announced its acquisition of Panamint Valley Limestone (PVL), a southern California-based quarry that mines limestone for building materials and a variety of other end uses. Now that the acquisition is completed, SGI plans to make investments to enhance site capabilities to serve an expanded market while continuing to deliver exceptional products and the highest level of service to existing customers.