Just to visualise the potential multimillion tonne reserves of Blackbird 2 a bit:

Hypothetically speaking:

if you have a piece of land in the form of a cube, that is 100x100x100 meters

then you have a density(hope it is the right english word for it) of about 2.5 per m3 (please correct me if this should be higher)

then you have: 250x250x250 tonnes of ore in only a cube of 100x100x100 meters. This is not that unthinkable imo.

This would result in a total of about 15-16 million tons

Multiply this with $1890,- per tonne

You'll reach about $ 29 billion dollars worth.