See also: Tretoil and Messar. Amalgamation: Tregollen. Worked with: Messar.

Opened in 1838, Lanivet Consols, which amalgamated with Tregollan Mine in 1839 as Tretoil Consolidated Mines, is situated one and a half miles southeast of Lanivet. It encompasses Wheal Messar and the former sett of Blackheath or East Tretoil Mine.

Recorded output includes: Tretoil (1838-39, 1858, 1874, 1875 & 1882): 11,755 tons of 7.25% copper ore and 30 tons of black tin. Messar (1841-55 & 1859): 2,078 tons of 6.5% copper ore. Tretoil & Messar (1859 & 1860): 100 tons of 5.75% copper ore, 19 tons of black tin, and 156 tons of zinc ore. Tregullan (1842-44): 1,163 tons of 6.25% copper ore and 7,910 tons of iron ore; (1852-54): 12 tons of lead ore. Lanivet Consols (1844-1845): 481 tons of 2.5% copper ore; (1865-67): 468 tons of iron ore, 30 tons of pyrite.

References to Churchite and danalite at Tretoil Mine are cited from Kingsbury (1956 and 1961, respectively), although further confirmation is required due to doubts about the provenance of other Kingsbury specimens (Ryback et al., 1998, 2001).