SGI’s Ione plant is located 50 miles southeast of Sacramento, California. Through the addition of the Ione plant, SGI became a national provider of roofing granules. With 54 employees, the Ione facility contains an open pit quarry that mines meta-basalt rock, which is crushed and screened to produce raw granule production feedstock. These raw granules are then either converted into colored roofing granules or headlap, uncolored granules used on the unexposed section of shingles. The full range of products produced at the Ione facility are sold to roofing manufacturers in the western United States. Continued investment in the quarry, mill, coloring plant, and product storage areas of the business has driven steady growth at the Ione facility. The Ione plant ships its products by truck and by rail on the Union Pacific railroad.