Noble Energy has been operating in the Mediterranean Sea, offshore Israel, since 1998. We have a 47 percent interest in the Mari-B field, the first offshore natural gas production facility in Israel. Production from Mari-B began in 2004 and sales volumes have increased as Israel's power demand and pipeline infrastructure have expanded tremendously. A string of successful wells at Tamar, Dalit, Leviathan, Dolphin, and Tanin have resulted in a very large inventory of natural gas resources. In late 2011, we announced a significant discovery offshore Cyprus which further expanded the resource inventory. Sales from Tamar began on March 31, 2013, in just over four years from discovery.
We have a 36 percent operated working interest at Tamar, with gross mean resources of 10 trillion cubic feet (Tcf) of natural gas. Tamar was the largest deepwater natural gas discovery in the world in 2009. Sanctioned in September 2010, Noble Energy and its partners worked to bring reliableand clean natural gas to market as soon as feasibly possible.
Noble Energy developed two smaller fields, Noa and Pinnacles, to provide natural gas until Tamar was completed.
Leviathan represents the largest exploration success in Noble Energy's history, with gross mean resources of 18 Tcf of natural gas. We are actively studying multiple export options, including both LNG and pipeline scenarios. We are appraising the massive field and are planning to test a deep oil concept beneath the field late this year.
In late 2011, we announced a discovery offshore Cyprus with estimated gross mean resources of 7 Tcf. In early 2012, we announced our sixth consecutive field discovery at Tanin with estimated gross mean resources of 1.2 Tcf. We have now discovered approximately 37 Tcf gross of new gas resources from this region.