Considered one of Texas' most significant natural resources, sulfur deposits first attracted speculators' interest in the mid-1800s. Significant mining did not begin, however, until around 1919, when the Texas Gulf Sulfur Company began extraction at the Big Hill Dome deposit in Matagorda County. It is estimated that since then, Texas has produced approximately 80 percent of the nation's sulfur supply. In the second part of this government-produced educational film from the 1930s, the sulfur mining industry in Texas and the United States is detailed and elaborated on.