A never-failing spring called Brownrigg Well exists below the summit of Helvellyn, about due west of the highest point, at the head of Whelpside Gill. In the nineteenth century a leat was constructed to direct the water of this spring into the gill to its north to serve the needs of the Helvellyn Mine further down. This leat has now fallen into disuse. The gill it led to is not named on any map, but some authors have referred to it as Mines Gill.