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Mastery Tokens give 0.1% of the maximum mastery pool exp to mastery pool of the corresponding skill when they are claimed. Mastery Tokens are earned randomly while skilling in a noncombat skill. The drop chance for mastery tokens is 1 in [math]\frac{18\,500}{\text{Milestones unlocked for skill}}[/math]. Each thing you unlock by leveling the skill counts as a milestone e.g. smithing steel platelegs is unlocked at level 40 and counts as one milestone, additionally reaching level 99 in a skill counts as one milestone. Wearing Clue Chasers Insignia increases the drop chance by changing it to 1 in [math]\frac{18\,500 \times 0.9}{\text{Milestones unlocked for skill}}[/math].
Mastery Token Chance at Level 99
Token 
Skill 
Approximate Mastery Token Chance

Without 
With


Smithing

1/159

1/143


Runecrafting

1/217

1/195


Fletching

1/324

1/292


Crafting

1/377

1/339


Herblore

1/685

1/616


Fishing

1/770

1/693


Farming

1/804

1/723


Summoning

1/880

1/792


Cooking

1/1,088

1/979


Mining

1/1,541

1/1,387


Agility

1/1,541

1/1,387


Woodcutting

1/1,850

1/1,665


Firemaking

1/1,850

1/1,665


Thieving

1/2,055

1/1,850
