Indeed i was wrong, at least for most recent version. The item it's called clean silver gravel and yields 125% of both silver and lead in slag furnace. But it never was 3 silver and 2 lead, and OP is still using 1.4.7 it seems.
But since you now get 250% of your ore before crystallizer many more people may use this system.
But since you now get 250% of your ore before crystallizer many more people may use this system.
But the thing is, will you be able to keep up with quarry to process all your ores?It could be, all it takes is water on a timer. People do it for vanilla wheat farms all the time.