Thomas was my great-great-grandfather! I'd read the brief mention in Eric Holland's book but it is fascinating to see the article from the newspaper of the day.
Thomas's son Mark was interviewed in 1842 by Lord Ashley's Commission into working conditions in the mines. The text reads: "He is 16 years old and works at the copper mine. Tubbs, that is, works the jigging machine. He does not work in the winter and has been at work for about 6 years. He gets 1s. 2d. a day. He never went to day school but learned to read at Sunday School and to write at night school. He learns ciphering and knows figures but has not yet learned much. He works 10 hours a day." (Attrib. Ian Winstanley at the Coal Mining History Resource Centre.)