Ruby,
Blk 2 692km2 X 23% = 159.16
Blk 4 857km2 x 17% = 145.69
(say)blk 3 666km2 X 10%= 66.6
Totals for 3 blcks 2215 km2 of which ERHE has potential rights to 371.45 KM2 or 16.8% of blck 2,3 and 4 total. I think they will end up with more, but I just wanted to do the math. If I screwed up the math, blame my kids and Avatar!
Brez
PS I now read that people responded to your math, sorry didn't mean to sound that I was ganging up on you.