See also: New Penrose. Wheal Trewavas features a large spread of dumps and two engine houses, with adits in cliffs. Tristramite, a mineral discovered during X-ray diffraction examination of radioactive material from southwest England by the former Atomic Energy Division of the Geological Survey and Museum of Great Britain (now Institute of Geological Sciences), has been identified in samples from several old copper and/or tin mines in Cornwall, including Trequeen, Wheal Alice, Wheal Buller, Wheal Damsel, and Wheal Providence. However, the best specimens to date have been found at Wheal Trewavas, where tristramite occurs as a fine-grained aggregate and as coarser-grained infillings occupying fine fractures and cavities.

1834-1846 1879 trials.