Mining and quarrying have shaped the Macungie area for many hundreds of years. The earliest extracted rock used by humans here was jasper, which the Lenape Indians shaped by knapping into arrowheads, spear tips, scrapers, and knives, then traded widely across North America along paths that influenced later roads. Early German settlers favored the valley’s limestone soils and used burned lime from farm kilns to maintain fertility and from larger kilns for mortar, plaster, whitewash, and disinfectant, while some quarries also supplied limestone as flux for iron furnaces. Iron ore was mined from many pits in Lower Macungie Township, including near Jonas Bastian’s mine, washed to remove clay, and hauled to furnaces in Macungie, Alburtis, Emmaus, and other places or to loading wharves along the East Pennsylvania Railroad. After the first commercially successful anthracite-fueled iron furnace in the United States was blown in in 1840 at Catasauqua along the Lehigh Canal, ironmaking and ironworking became Lehigh County’s largest industry, spreading to other furnace sites along the Lehigh River and later along railroads. As iron became cheaper and more abundant, mechanics, engineers, and farmers used it to create new tools, engines, and equipment, and Elias Bastian, who owned and operated the farm where Hamilton Crossings stands, won patents for improved farm machinery. The Lehigh Valley later became the country’s largest pig iron producing region, with ore raised from open pit and underground mines by headframes and taken to blast furnaces to be smelted into pig iron for casting or further processing into wrought iron or steel.