The petroleum industry in Ohio dates from 1859. Ohio continues to produce significant quantities of oil and gas, having produced more than 1 billion barrels of oil and 9 trillion cubic feet of natural gas since 1860. Unconventional resources, primarily in eastern Ohio, are likely to increase production in Ohio. In late 1859, blacksmith William Jeffrey drilled the first well in Ohio specifically intended to produce petroleum. This well is located in Mecca Township, Trumbull County, northeast of Warren. In 1860, similar activity occurred in Macksburg.