Note the following excerpt from the article posted on the Noront Board, about Thunder Bay not being optimistic that they'll be awarded the processing:

The company has collected a 200-tonne sample of ore and sent it to South Africa for processing.

“That went very well, we had very encouraging results from that testing. The process is consuming less power than we thought and it’s producing an exceptional product,” Mitchell said, saying diamond drilling suggests the chromium deposit is even larger than first believed.

This is the first implied reference to any activity that Cliffs has been involved in, with respect to additional work in the Ring.

Of course, this alleged 200-tonne sample could refer to ore from Black Thor, not Big Daddy.

It also implies that perhaps work has been done on further delineation to the size of Big Daddy. Or Black Thor.