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Well, I did a calculation some times ago when the pools hashrate where at ~100PH.
But now you cleared it up, wich is good for all people that might use the pool with low hashrate.
Would be nice to supply those numbers from time to time for new useres.
Even at 100PH, dust per block would still only be around 1TH before the halving, not 200TH.
Now after the halving 100PH would set dust around 2TH.
Difficulty makes no difference, only the block reward vs the pool size.
So the calculation is simple.
But it makes no difference now, the pool has a proper accounting system I've written and implemented that shows your balances.
I guess if we ever get back up to multiple blocks a week (or a day) I'll even add a weekly/monthly balance payout so anyone who earns more than dust in a month of blocks will, at least, get a payout each month.
The dust figure (0.0001 BTC) is related to bitcoin and it's limitations.
If you send transaction with amounts smaller than that in any output, the transaction may never be confirmed due to the default relay settings in core bitcoin (though I must admit I've not checked that recently, it may be an extra digit lower now?)