As at December 31, 2012, we had gross interests in three PPLs and one PRL in Papua New Guinea covering 3,996,453 gross acres (3,030,720 net acres), all of which were operated by us. PPLs 236, 237 and 238 and PRL 15 are located onshore in the Eastern Papuan Basin, northwest of Port Moresby.
On November 30, 2010, we were granted PRL 15, covering a total of nine graticular blocks including and surrounding the Elk and Antelope fields and extracted from PPLs 237 and 238. This PRL unifies the Elk and Antelope fields into a single license and separates the fields from our exploration acreage. The PRL has a separate minimum work program and expenditure commitment and is valid for five years to November 30, 2015.
In order to develop and commercialize the Elk and Antelope fields in PRL 15, we are obligated to apply for and obtain a Petroleum Development License covering the acreage surrounding the fields and on which to locate facilities and pipeline rights of way. PRL 15 allows us to evaluate the technical and commercial feasibility of condensate and/or gas production from the Elk and Antelope fields, pending development and submission of an application for a Petroleum Development License in respect of those fields.
The following table summarizes our interests and on acreage currently held by us as at December 31, 2012: