Pittsburg Lumber Company was active in 1890: it bought pine timber from the Cooper and Lee families located in Camp County, as well as a block of land fronting on Jefferson and Marshall streets for $1900 in 1898 to Greer Bros. It was cutting 20,000 feet daily in 1893.
Like many other lumber companies this one financed mortgages for smaller lumber plants. In 1894 Pittsburg Lumber Company gave a deed of trust to S. G. Dean & Co. on the latter's drug store, a sawmill, commissary, and Dean's home. The total price was $23,3000. The drug store was located on Jefferson Street and the sawmill plant adjacent to the Cotton Belt. W. N. Jones and K. E. Smith of Jones and Smith Lumber Company also mortgaged their sawmill plant located about eight miles east from Pittsburg to Pittsburg Lumber Company. The practice of financing mortgages allowed the larger company to contract the smaller sawmill's cut at a lesser price; in case of default, the larger company could either run the plant or sell it.