Wearing full prospector while entering the Mining Guild is one of the tasks in the hard Falador Diary. Trying to complete this task using the Varrock armour 4 will not work. Similar to the Desert robes and various other desert-related items, wearing the full Prospector Kit in the desert will reduce the amount of waterskins needed to survive. Pieces of the kit may be purchased from Prospector Percy in the Motherlode Mine using golden nuggets obtained randomly through prospecting pay-dirt. The set costs 180 nuggets in total.