You might be interested in some recent historical archaeology led by the Houston Archeological Society and the Texas Archeological Society on former plantations in Brazoria County, Texas. Before 1865 the area was approximately 90% black demographically because of the presence of numbers of sugar-cane plantations in the bottom-lands of the Brazos River. One of the prominent planters was Abner Jackson, whose family continued to work the plantations into the 1870's when the State used property taxes to seize numbers of large holdings like his. They were then transformed into (in the case of Jackson's principal residence) an insane asylum and state prison-farms. These prison farms still exist: Derrington and Retrieve Units of the Texas Department of Corrections used to be Jackson's Derrington and Retrieve plantations.
The TAS and HAS have excavated at Lake Jackson, the site of the former asylum, and uncovered much of the millworks and auxiliary buildings on the plantation, as well as the foundations of the main house. They have been interested to compare physical remains of the slave period with construction carried out with convict labor, and the comparison shows the slaves' workmanship in a good light. They have also collected and documented great numbers of artifacts associated with various periods of the site's use, and I think by now they will have published the site, although excavation was still in progress as of four or five years ago, the last time I heard about it.
For your possible interest. The HAS, by the way, is sponsored by the University of Houston and meets on the campus of the University of St. Thomas.