Infernal shale

Infernal shale
Released							14 May 2025 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							No
Bankable							Yes
Equipable							No
Stackable							No
Noteable							No
Options							Drop
Examine							Flaky, chalky, and warm.
Values
Value							80 coins
High alch							48 coins
Low alch							32 coins
Weight							1.814 kg
Advanced data
Item ID							30846
Link							MOID

Infernal shale is an ore that can be mined in the Chasm of Fire with level 78 Mining, granting between 13.2 and 100 experience. It can be crushed into crushed infernal shale with a hammer and a chisel, which is necessary for the creation of oathplate armour.

The shale can be acquired by three different mining methods:

• Mine the active infernal shale deposit. This is the slowest and least click-intensive method.
• Mine the infernal shale rocks normally.
• Use Jim's wet cloth to 3-tick mine the infernal shale rocks.

Each infernal shale can be crushed into 1–3 crushed infernal shale. When crushing them, it is recommended to do so with 9 or fewer shale in the inventory – in this case, the expected yield from each shale is 1.7 crushed shale, but with 10 or more in the inventory, the expected yield is only 1.4 crushed shale.

Crushing the shale provides no experience, and it will not automatically process, so each infernal shale must be individually clicked. Repeatedly using a chisel on the very last shale in the inventory is the easiest way to process infernal shale.

The Imcando hammer is an acceptable kind of hammer while equipped or in the inventory.

Drop rates are estimated based on 441 samples from the Drop Rate Project, unless otherwise cited.

The amount of crushed shale received varies depending on how many shale are in the inventory at crush time. With nine or fewer, each action always consumes exactly one infernal shale, and the expected yield is 1.7 crushed shale.

With ten or more in the inventory, for each action there is a 50% chance to consume one shale and a 50% chance to consume two. From there, the chance to receive a given number of crushed shale is detailed below. Overall, the expected yield from one input shale is 1.4125 crushed shale.

The following money making guides are available for Infernal shale:

v t e Yama
Monsters	Yama Judge of Yama Void Flare Fire spell
Signature drops	Barrel of demonic tallow Chasm teleport scroll Diabolic worms Dossier Forgotten lockbox Oathplate shards Rite of vile transference Soulflame horn Yami Contracts Acquisition Catalyst acquisition Familiar acquisition Harmony acquisition Oathplate acquisition Shard acquisition Worm acquisition Sigil pieces Bloodied blows Divine severance Forfeit breath Glyphic attenuation Sensory clouding Oathplate armour Helm Chest Legs Purifying sigil Purifying sigil Bottom Left Middle Right Top Radiant oathplate Helm Chest Legs
Related	Strategies Chasm of Fire Demon dung Imp Jim Disciple of Yama Sign Here Oathplate smithing Infernal shale (crushed) Infernal blend (malformed) Infernal nugget Infernal chunk (cooled) Infernal plate