This sawmill company was established before 1892 and was engaged it building tram lines to its various county mills. The Texas Southern bought up the tram lines of Commercial and operated rail traffic in Upshur and Harrison counties. This lumber operation was listed as a sawmill in the Reference Book of the Lumbermen's Credit Association, January 1905 and for 1907. In 1907, a fire wiped out the mill. Clark et al. closed operations and moved to Arkansas, where they operated the A. L. Clark Lumber Company.
Many of the mill hands, white and black, moved with Clark to Glenwood, Arkansas. This was the first time in the area that African-Americans had lived amongst the whites. Racial antagonism was so bad that company guards kept watch at night while the black mill hands and their families slept in the commissary at night for protection.
Its logging tram extended from Gilmer for sixteen miles to Ashland. It was bought by the Texas Southern Railway Company in 1892.
Doyal Loyd noted in his work that the large Gilmer mill contracted at least ten smaller mills in the county to keep it supplied with rough lumber.