** Shares of Whitebark Energy WBE.AX fall as much as 11.1% to A$0.004, their lowest level since September 18
** Stock set for biggest pct fall since September 17
** Oil and gas producer commences comprehensive review of its Warro gas field in Perth basin, Western Australia’s premier onshore gas province
** Decision to re-evaluate will target the field’s significant contingent resources, help in identifying producible gas zones and improve recovery potential - co
** Says recovering a modest volume of gas would be materially important, given rising Western Australia gas pricing
** Stock is down 60% YTD, including the session's moves
(Reporting by Anjali Singh in Bengaluru)
((anjali.singh2@thomsonreuters.com;))