Several people responded, including Mr Craig Moore, who had done some research on the Avondale mineshaft in the mid 1990s. At that point, Moore had been told by the property owner, Greg Deveraux, that the shaft was the remains of an exploration site for a copper mine, dating to 1899. He corroborated that local knowledge holds that the offshore sand bar was the remains of the excavation, and concluded his note with a bit of a mystery. Apparently, a ship left the area in 1899 headed to Wales with a load of ore samples from the exploration site, but the ship never reached its destination.
Other people responded with information about different abandoned mines. Some told me about abandoned mines in Tilt Cove, Marysvale and Brigus. Susan Furneaux wrote,
In addition to these emails, Linda Lewis sent me the above photo, with this note:
You can read Mr Veitch's will online here.
If you have heard a story about any of these mines, email me at firstname.lastname@example.org. I'd be particularly interested in knowing the exact location of the Marysvale/Colliers/Brigus mines, if you've seen them in your own explorations, or in other old photos of mining activity in Newfoundland and Labrador.