Frequency of Blackrock?

[Rocklin]

I have started playing again after a long time off. Mining has changed now with the random spawn system. I missed the "hay-day" of Blackrock, but I was hoping to get some from mining now. I understand the smaller rocks are all that are available. How often do they spawn while mining and is there a specific area that favors their drop?

 

[Sarsmi]

I dunno, seems like 1 per 1000 digs or so and it doesn't matter where you mine or what you mine as far as I can tell. You can only get the very small blackrock now btw. It is very easy to miss in your pack also, but you will no longer spawn blackrock elementals if you happen to have any while mining.

 

[Hildebrand]

It's about as rare as getting gems on my elf. Or maybe a little more rarer.