NOT to my recolection drilled a couple shallow angled holes toward the SE to the north... This was supposed to close off the deposit to the north.... But since they were shallow and angled away from PRB this did not definatively close off the extension to the north.
Now NOT may have more info from down hole that they have not shared in the public domain.
I figure that since Dave has indicated an anomoly at about 400 Meters in depth within the peridotite now known to be mineralized with the correct combination of metals.... Chances are PRB could hold an extension to DE 1 at depth to the north.... JMHO
The next round of drilling should prove or disprove this. Hopefully we see more than 2 holes near DE1 I would like to see a fence line of 8 to 10 deep holes to answer this question definatevely.