i'm not sure about the footwall terminology, this is an old...

i'm not sure about the footwall terminology, this is an old mining term usually reserved for shear and vein hosted mineralisation. 

in the description and the cross-section they refer to a dome, so to me porphyry style fluid accumulation is more appropriate - or given that they are sedimentary rock hosts then a fluid trap on top of a dome. domes are excellent fluid focusing structures, so i'd be focusing on that aspect as it is easier to explain, simpler to target, and the target/prize is bigger - in my experience anyway.

how big can the prize be? the golden mile in kalgoorlie sits on top of a dome, need i say more.....