Cost of each item:
- Prospector helmet - 40 golden nuggets
- Prospector jacket - 60 golden nuggets
- Prospector legs - 50 golden nuggets
- Prospector boots - 30 golden nuggets
Golden Nugget cost per 0.1% Mining Experience Boosting ability Edit
Prospector Helmet = 40 golden nuggets / 0.4% XP boost = 10 golden nuggets / 0.1% XP boost
Prospector Jacket = 60 golden nuggets / 0.8% XP boost = 7.5 golden nuggets / 0.1% XP boost
Prospector Legs = 50 golden nuggets / 0.6% XP boost = 8.33 golden nuggets / 0.1% XP boost
Prospector Boots = 30 golden nuggets / 0.2% XP boost = 15 golden nuggets / 0.1% XP boost
The Prospector Jacket offers the best deal in terms of cost in golden nuggets per 0.1% XP boost. The Prospector Legs are second-best, the Prospector Helmet is third-best, and the Prospector Boots are the most expensive in terms of golden nugget cost per 0.1% XP boost.
Similar to the Desert Robes and various other desert-related items, wearing the full Prospector Kit in the desert will reduce the amount of water-skins needed to survive. This was confirmed by Mod Ash during the Runescape Mythbusters Special - Ep. 2 on Jagex's official OldSchool Runescape youtube channel.