Clue geode

Clue geodes are rare rocks that can be found while training the Mining skill instead of receiving an ore if the player has not completed X Marks the Spot. After completing the quest, Scroll boxes are found instead. Searching them will give players a clue scroll of the same difficulty as the geode given, or the corresponding scroll box if the player completes X Marks the Spot after receiving it. Like clue scrolls, players can only have one of each difficulty of clue geode in their possession. If a player possesses a clue scroll of the same difficulty as the clue geode, they will be unable to search the geode until the clue scroll is no longer in their possession. Players can toggle whether or not they wish to receive clue vessels by talking to Arthur the Clue Hunter in Lumbridge.

There are five types of clue geodes:

• Clue geode (beginner)
• Clue geode (easy)
• Clue geode (medium)
• Clue geode (hard)
• Clue geode (elite)

Rates

The chance of obtaining a clue geode depends mainly on the player's Mining level together with the type of rock that is excavated, similar to how the drop rate of skilling pets is determined. In addition, the reward tiers unlocked by completing Combat Achievements grant a 5% boost to the drop rate of the corresponding clue tier, that is to say the easy, medium, hard, and elite clue geodes.

template = Calculator:Mining/Clue geodes/Template
name = Clue geode chance calculator
form = geodeCalcForm
result = geodeCalcResult
param = playername|Name||hs|miningLevel,15,1
param = miningLevel|Mining Level|99|int|1-120|
param = caTier|Combat Achievements Tier|None|select|None,Easy,Medium,Hard,Elite+

This calculator requires JavaScript to run.

Formula

Upon a successful skilling action, a roll is made for each clue tier one is eligible to receive (based on which types of clue are already owned) independently of the outcome of any of the other rolls. For each tier of clue geode, the following formula is used to determine its drop chance, whereupon a roll is made if the player is eligible.

The chance is $1$ in $\lfloor \frac{\lfloor \lfloor \text{BaseChance}\times 0.7\rfloor \times \text{CA}\rfloor }{100+\text{Mining}}\times \text{ClueTier}\rfloor$

Where:

$\text{BaseChance}=$ The base chance of receiving a clue geode from extracting a specific type of ore. These are the same base chances that determine the drop rate of the rock golem pet.

$\text{CA}=$ A multiplier of $0.95$ if the corresponding reward tier of Combat Achievements has been unlocked, or $1$ if it has not.

$\text{Mining}=$ The player's visible Mining level. Visible boosts beyond level 99 are taken into account.

$\text{ClueTier}=$ The clue tier modifier applied at the end based on the type of clue that is rolled.

Base chance

The table below displays the base chance of obtaining a clue geode according to rock type.

Rock	Chance
Clay rocks	741,600
Copper rocks	741,600
Tin rocks	741,600
Blurite rocks	741,600
Limestone rock	741,600
Iron rocks	741,600
Silver rocks	741,600
Barronite	741,600
Coal rocks	290,640
Sandstone rocks	741,600
Gold rocks	296,640
Gem rocks	211,886
Granite rocks	741,600
Ash pile	741,600
Volcanic sulphur	710,000
Mithril rocks	148,320
Lovakite rocks	245,562
Adamantite rocks	59,328
Runite rocks	42,377
Amethyst crystals	46,350
Blast mine	123,600
Crashed Star	521,550

Clue tier

The following modifiers are applied to the denominator of the drop chance, depending on the type of ore for which a roll attempt is made.

Clue tier		Modifier
	Beginner	0.2
	Easy	1.7
	Medium	2
	Hard	3.3
	Elite	10

Other factors

Prior to the release of Combat Achievements, the ring of wealth (i) was confirmed to double the rate of clue geodes when mining in the Wilderness, but whether that effect still applies has not yet been reaffirmed.

Changes

Date	Changes
2 July 2025 (Update)	Clue geodes are only dropped prior to the completion of X Marks the Spot.
8 May 2024 (Update)	Clue geode drop rates have been increased by ~30% from all sources.
21 July 2021 (Update)	Clue geode rates are now affected by completion of Combat Achievements. Clue geodes no longer roll to determine which tier of clue you get after the initial roll to give you a clue geode.