sentences:  Discovered by chance during a rabbit hunt in 1836, industry around this mine led to the construction of a small gauge railway and the installation of steam pumps.The mine is believed to have had a length of 2,000 feet/600 m and depth of 700 feet/200 m. Close to the port there were four shafts leading to the galleries.Sark's Hope shaft was the westernmost, almost on the edge of the cliff.