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Entries - Entry Category: Industries - Starting with L

Lead and Zinc Mining

The history of lead and zinc mining in Arkansas is linked because ores of these two metals often occur together. Lead and zinc in Arkansas occur principally along the upper White River and its tributaries in Baxter, Boone, Independence, Lawrence, Marion, Newton, Searcy, Sharp, and Stone counties. Other locations include the Kellogg Mine in Pulaski County and the Ouachita Mountain mineral belt. Lead (Pb) is a soft, highly dense metal recognized for its low melting point and superb resistance to corrosion. Galena (PbS), containing about eighty-six percent lead, is the only lead mineral of commercial importance in Arkansas. Silver is sometimes found as an impurity that, in larger concentrations, can be extracted as a byproduct. Lead was once used to …

Levi Wilcoxon Demonstration Forest

The Levi Wilcoxon Demonstration Forest (LWDF) is located about three miles south of Hamburg (Ashley County) along U.S. Highway 425. Currently owned by Plum Creek Timber Company, the LWDF is a remnant of the old-growth pine forest that once covered much of southern Arkansas. The LWDF is notable for the dimensions of the loblolly and shortleaf pines still found within its boundaries—most of the pines in this roughly ninety-acre stand are between 100 and 200 years old and over 100 feet tall. For example, the “Morris Pine” is a loblolly fifty-six inches in diameter, 117 feet tall, and estimated to be at least 300 years old. The national champion shortleaf is also found in the LWDF and measures thirty-six inches …

Little Rock Picric Acid Plant

Arkansans supported the American effort in World War I in many ways. Some served in the armed forces, while others worked to grow and conserve food and make clothing and bandages for the troops. Many worked in a number of war industries, including a munitions plant built outside of Little Rock (Pulaski County) in 1918, tasked with manufacturing a high explosive—a rapid and destructive chemical explosive—known as picric acid. Picric acid (trinitrophenol) is made of phenol and several acid compounds that, when combined under proper conditions, form a honey-like substance that can be loaded into artillery shells. It is stable enough to survive the shock of being fired from a cannon, but, when detonated by a fuse, is very destructive. …