The 1926 discovery of large limestone deposits at the San Jacinto Estancia inherited from his father led Fortabat to open a cement factory in the nearby pampas hamlet of Loma Negra (south of Olavarría); the choice of location prompted him to christen the company Loma Negra ("Black Mound").
The estancia was named for Harberton, Devon, the home of his wife, Mary Ann Varder (1842-1922).
La Estancia is a small Caserio (town) part of the Texistepeque municipality in the Santa Ana department located 85.7 Kilometers (53.25 miles) from El Salvador's capital San Salvador.
During the war, in 1769 he led a malón against the region of Laja River and Los Ángeles taking cattle and destroying every estancia in their path.