Unlock the secrets of the Infernal Heart, a thrilling volcanic digsite filled with rare and valuable minerals. Learn where to find it, when it opens, and what tools you need to mine. Discover the full range of minerals, from common ores to mythical treasures, and how to use them for crafting powerful gear in this ultimate prospecting hotspot.
Infernal Heart Overview

The Infernal Heart, introduced with the Volcanic Expansion update, is a prime digsite for experienced prospectors. It offers many valuable minerals, including rare items like the Volcanic Key and Dragon Skull. To mine these high-tier minerals and complete the digsite’s collection page, you’ll need a shovel with at least Toughness 5.
Location & Timings
Located beyond the Magma Furnace on Caldera Island, the Infernal Heart opens every hour at 15 minutes past (your local time). Anyone can enter, but only those with a Divine Shovel or better can collect minerals. When it opens, a notification saying, “The volcano rumbles… The Infernal Heart is open!” appears for all players in the server. The digsite remains open for 30 minutes, closing at 45 minutes past the hour, so be quick. After it closes, there’s a short wait until the next opening.
Note: Luck Totems work here, just like in other digsites, helping you increase the odds of finding rare minerals like Inferlume, Painite, Uranium, and Fire Opal.
Minerals Found at Infernal Heart
Here’s a breakdown of the 21 minerals you can find, organized by rarity and including their in-game values:
Common Minerals
- Copper: A flexible metal commonly used in electronics ($800/kg).
- Obsidian:Black volcanic glass formed when lava cools quickly ($3,000/kg).
Uncommon Minerals
- Topaz: A gemstone symbolizing strength and honor ($14,000/kg).
- Zircon: A dark orange gemstone containing zirconium ($25,000/kg).
Rare Minerals
- Peridot: Olive-green gemstone often found in volcanic rock ($60,000/kg).
- Onyx: Jet-black gemstone ($75,000/kg).
- Pyrelith: Energetic crystal formed in the heart of a volcano ($150,000/kg).
Epic Minerals
- Pyronium: Volcanic metal that continuously emits heat ($226,000/kg).
- Osmium: Dense, rare, and toxic metal ($300,000/kg).
- Opal: Iridescent and colorful gemstone ($325,000/kg).
Legendary Minerals
- Rose Gold: Rare gold with a distinctive rose tint ($500,000/kg).
- Cinnabar: Vermillion mineral used to extract mercury ($900,000/kg).
- Uranium: Radioactive chunk of metal ($1,500,000/kg).
- Volcanic Key: Mysterious key with unknown other uses ($1,500,000/kg).
- Fire Opal: Opal with a brilliant orange shine ($1,600,000/kg).
- Dragon Bone: Fossilized bone from an ancient dragon ($2,000,000/kg)
Mythic Minerals
- Painite: Extremely rare red gemstone ($10,000,000/kg).
- Inferlume: Glowing crystal with flame-like properties ($14,000,000/kg).
- Flarebloom: Mythical flower growing in extreme volcanic heat ($30,000,000/kg)
- Volcanic Core: Highly unstable core with immense energy ($40,000,000/kg).
Exotic Mineral
- Dinosaur Skull: Fossilized skull of a dinosaur, an unexpected find here ($50,000,000/kg)
Crafting Uses: Besides selling these minerals, you can use many to craft rare gear. For example, the Fossilized Crown requires five Cinnabar, five Dragon Bones, one Volcanic Core, and the Dinosaur Skull.