jocot did you not read this..

"""""""RESERVE AND CONTINGENT RESOURCE STATEMENT AS AT 30 JUNE 2009
The reserve and resource estimates outlined below represent Otto’s net interest in the gross remaining reserve and resource estimates. The petroleum reserve and contingent resources have been estimated by Otto using definitions and guidelines published in the Society of Petroleum Engineers Inc./World Petroleum Congresses/American Association of Petroleum Geologists/Society of Petroleum Evaluation Engineers (SPE/WPC/AAPG/SPEE) Petroleum Resources Management System (March 2007).

3.The reserve and contingent resource estimates have been compiled by Mr Craig Martin. Mr Martin is the Chief Operating Officer of Otto and a full time employee. Mr Martin has more than 20 years of relevant experience and is qualified in accordance with ASX Listing Rule 5.11. Mr Martin has consented to the form and context that this statement appears.""""""""""""""""

seems to me that you are wasting your time with independent assessment & throwing money down the drain.

just do it by the above standards and she's apples.