What's interesting about this is that they said that the model matches the drill results very well... Look at the conductivity blob on the right (the original one they identified as the discovery zone), it's just a blob, whereas the one on the left actually has some distinctive features. The fact that the modeling software can reproduce drill results of something so distinctively shaped says a lot about the accuracy of the modeling software.
And for those in doubt, 700 m is not deep. The local major would have no problems underground mining this orebody if the grade and host rock are cooperative.