Its entirely possible it plunges downward 1km possibly towards 2km, i think SIR is playing it right drilling down around 400m and then moving along getting good bang for our drilling bucks delivering excetional results, its possible they could sweep the entire 4 conductors to this depth(400m) if the others are holding sulphides also.
Once this is done they may then sweep the whole area another 200m - 400m deeper to test and so on..
Your ongoing drilling theory is deffinately the case and could be ongoing for 2 - 5 years.
SIR Price at posting:
$2.93 Sentiment: LT Buy Disclosure: Held