Admiralty Sailing Directions suggest that Grassholm's '? rugged shores are scarely approachable; landing however, may be affected at the west end.' It is presumed that this is associated with the quarry to the northwest of the lighthouse.

Sources include;
Admiralty, 1870, Sailing Directions for the West Coast of England from Milford Haven to the Mull of Galloway including the Isle of Man, pg6

Maritime Officer, RCAHMW, August 2014.