I think these numbers are very conservative based on new information brought to light by the recent meeting after the AGM. On investor village Newlifestyle, who attended the meeting, reported that George Langdons new estimate of the Greenpoint shales was probably three times thicker then originally thought. So you can probably multiply those numbers by 3.
http://www1.investorvillage.com/smbd.asp?mb=11925&pt=msg&mn=14772
Shepp