The following obit may be of interest to your research...
published 27 Sept 1858, Fayetteville (North Carolina) Observer Death Notices DIED In Asheborough, on the 23d inst., JOHN GLUYS, aged 63. He was born in Cornwall, England, and had been a resident in this country about 24 years. In his death, the community in which he live has sus- tained a loss. He was a man of great industry, of the strictest integrity, of much mechanical skill, of exem- plary deportment, and a man who attentively "minded his own business." --Com. ------
NOTE: "Asheborough" is the old spelling of "Asheboro," county seat of Randolph Co, NC. I suspect this John "Gluys" is the John Gluyas, age 54, enumerated in 1850 in Guilford Co. (immediately north of and adjacent to Randolph), with wife, Mary, age 49. Both are shown "born in Cornwall," and John is listed as an "engineer."
Of interest, the Southern Historical Collection at UNC-Chapel Hill holds what appears to be the papers of this John Gluyus (b 1796- d 1858), collection #03062, but in the online description of the collection, Gluyas is described as a "Welsh mining engineer." http://www.lib.unc.edu/mss/inv/g/Gluyas,John.htmlhttp://www.lib.unc.edu/mss/inv/g/Gluyas,John.html