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[Dragonchampion]

Hello, everyone, I am quite new, and have noticed that when having my inexperienced miners mine ore and stone, hey sometimes do not mine the actual ore, leaving nothing after the square has been carved.

On the other hand, Legendary Miners have no such problem, leaving a 100% return on the items they mine.

I was wondering, how is the % of ore lost calculated? is is Level * 10%? Or some other formula?

Thanks for answering this if you do.

[Namfuak]

I don't know the formula exactly, but at around adequate you'll barely notice they are not generating stone/ore, and at master at least they will have a 100% return rate.  This can be bad if you dislike having stone lying around, but other than that it doesn't matter too much.

[Derekristow]

Tiredness, thirst, and hunger also factor in.  if you have a legendary who is really in need of all of those things you may notice and occasional miss.  I think what type of stone it is may also factor in, but I have no confirmation on that.

[Lord Darkstar]

Master level mines occasionally miss, so they aren't at 100% mining return. That's when they are fresh (not tired) and their skills not rusted.

The only 100% mining return is Legendary, and they need to not be tired or rusty for that.

[gtmattz]

Tiredness, thirst, and hunger also factor in.  if you have a legendary who is really in need of all of those things you may notice and occasional miss.

I am sorry, but you are smoking crack...  those do not factor into the mining return at all, maybe you think you saw it happen, but it did not.

[Mechanoid]

If you're concerned about your miners not giving you the most out of your ore mining, disable whatever legendaries you have and then set the rest to dig dirt or worthless stone layers (designate only the visible rock face to avoid ore/gem digging) Legendary miners ALWAYS return a stones /ores /gems when they dig whatever, so there's really no point in "training" them further then that. The only good miner is a legendary one.
If your dwarves are hungry /thirsty /sleepy, you have bigger issues at hand then digging rock.

As for your actual question:

I was wondering, how is the % of ore lost calculated? is is Level * 10%? Or some other formula?

I don't think anyone actually knows this. The only way to be sure is to SCIENCE your way through it, by digging out 100 tiles with 1 dwarf (for 10-100 dwarves) at each skill level and see how many rocks are left behind each time.

[Hyndis]

Tiredness, thirst, and hunger also factor in.  if you have a legendary who is really in need of all of those things you may notice and occasional miss.

I am sorry, but you are smoking crack...  those do not factor into the mining return at all, maybe you think you saw it happen, but it did not.

In some of the early 31.XX versions it did, but that issue has since been resolved. Skill rust was all sorts of wonky in early 31.XX versions. 31.16 has no issues with this whatsoever. Not sure about 31.17 as I haven't tried it yet, but I imagine its still fixed in 31.17.

[Lord Vetinari]

I don't think anyone actually knows this. The only way to be sure is to SCIENCE your way through it, by digging out 100 tiles with 1 dwarf (for 10-100 dwarves) at each skill level and see how many rocks are left behind each time.

That'll be more statistical tha scientific as if you have a, say, 1% chance to get a stone from digging, your chances are 1% on every tile.
In other words, it's not sure that with 1% you'll get one stone out of a hundred tiles.

[Xenos]

I don't think anyone actually knows this. The only way to be sure is to SCIENCE your way through it, by digging out 100 tiles with 1 dwarf (for 10-100 dwarves) at each skill level and see how many rocks are left behind each time.

That'll be more statistical tha scientific as if you have a, say, 1% chance to get a stone from digging, your chances are 1% on every tile.
In other words, it's not sure that with 1% you'll get one stone out of a hundred tiles.

Statistics is a science.

[Eagle_eye]

  I think what type of stone it is may also factor in, but I have no confirmation on that.

Nothing is changed by type except soils, which have a 0% return rate, and cotton candy, which has 100%.

[Lord Darkstar]

As for your actual question:

I was wondering, how is the % of ore lost calculated? is is Level * 10%? Or some other formula?

I don't think anyone actually knows this. The only way to be sure is to SCIENCE your way through it, by digging out 100 tiles with 1 dwarf (for 10-100 dwarves) at each skill level and see how many rocks are left behind each time.

Problem is that low skilled dwarves would level up their mining skill in digging 100 tiles. So you'd need several dwarves of the low level to actually mine out the 100 tiles for your data collection at that skill level.

[Kipi]

As for your actual question:

I was wondering, how is the % of ore lost calculated? is is Level * 10%? Or some other formula?

I don't think anyone actually knows this. The only way to be sure is to SCIENCE your way through it, by digging out 100 tiles with 1 dwarf (for 10-100 dwarves) at each skill level and see how many rocks are left behind each time.

Problem is that low skilled dwarves would level up their mining skill in digging 100 tiles. So you'd need several dwarves of the low level to actually mine out the 100 tiles for your data collection at that skill level.

Or use editors to keep your test-dwarf on certain skill level...