TL;DR : Legendary Quarrymaster now offers a measly 2.127% increase in damage per swing, and therefore ore acquisition.
The different tiers of quarrymaster now give 1/2/3/4/5% Bonus Critical Hit Chance
I bought the Legendary Quarrymaster aura with a year's worth of saved loyalty points on rework launch day (The in-store description has not been updated, it still says +15% chance to mine ore).
According to RS wiki: Damage per Swing = Mining Level + (Strength Level/10) + Damage Roll + Net Hardness + Crit bonus
Assuming the following:
Level 99 Mining
Level 99 Strength
Damage roll of 95 (Average for Elder Rune Pickaxe +5)
0 Net Hardness (pickaxe equal or greater tier than rock)
Base 30% Crit Chance (30% chance to deal 100 damage, averages out to 30 more damage)
No other Modifiers
Without Legendary Quarrymaster (30% crit chance): 99 + 9 + 95 + 0 + 30 = 233 Damage Per Swing
With Legendary Quarrymaster (35% crit chance): 99 + 9 + 95 + 0 + 35 = 238 Damage Per Swing
This difference of 5 equates to a 2.127% increase in damage per swing, this also means ores are acquired 2.127% faster than without the aura.
Considering to the high cost of the aura, as well as it's previous +15%, I was hoping that such a measly effect is unintended?
What do you think? /u/Shaunyowns
We've investigating this and decided that we're going to double the buff from 1/2/3/4/5% crit to 2/4/6/8/10% crit.
I don't know when this fix will be live. Not today in any case.
You should definitely be stacking skillchompas though. You're missing out on an extra 70 damage per crit which hugely buffs this aura.