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On the highest prominent hillock halfway up the steep slope above Speedwell Cavern. The site is on National Trust CROW land. Collapse of the original hillock and shaft top blocked the mine in the 1950s. Excavation and construction of a new permanent entrance into the 38m-deep natural shaft, and discovery and opening of the extensions was undertaken by the TSG 2014-19. Note that some sections require care, and the main chamber in the extensions has a taped pathway to avoid damage to vulnerable miners' fingerprints, bootprints and artifacts. Much of the vertical route and the extensions can be very wet after prolonged rain. Contact TSG for access.
See the DCA website for competition details.