3. Capitalized Exploratory Well Costs

The following table discloses the net changes in capitalized exploratory well costs pending determination of proved reserves during the three months ended March 31, 2017 (in millions):

Balance at January 1, 2017	$	597
Additions to capitalized exploratory well costs pending the determination of proved reserves		27
Balance at March 31, 2017	$	624

Capitalized exploratory well costs capitalized for greater than one year following completion of drilling were $511 million at March 31, 2017 and primarily related to:

Ghana: Approximately 55% of the capitalized well costs in excess of one year relates to our Deepwater Tano/Cape Three Points license (Hess 50% license interest), offshore Ghana. The government of Côte d’Ivoire has challenged the maritime border between it and the country of Ghana, which includes a portion of our Deepwater Tano/Cape Three Points license. We are unable to proceed with development of this license until there is a resolution of this matter, which may also impact our ability to develop the license. The International Tribunal for Law of the Sea is expected to render a final ruling on the maritime border dispute in September 2017. Under terms of our license and subject to resolution of the border dispute, we have declared commerciality for four discoveries, including the Pecan Field in March 2016, which would be the primary development hub for the block. Following a favorable outcome of the border dispute, we will have ten months to submit a plan of development to the Ghanaian government. Front-end engineering studies and other development planning is progressing.

Guyana: Approximately 20% of the capitalized well costs in excess of one year relates to the Stabroek Block, offshore Guyana (Hess 30% participating interest), where the operator Esso Exploration and Production Guyana Limited, announced a significant oil discovery at the Liza-1 well in the second quarter of 2015. During 2016, the operator completed a 17,000 square kilometer 3D seismic acquisition on the Stabroek Block and drilled the Liza-2, Liza-3, and Payara-1 wells, all of which encountered hydrocarbons. During 2017, the operator drilled the Snoek-1 well, which confirmed another oil discovery on the Stabroek Block. Development planning is underway and we expect to be in a position to sanction the first phase of the Liza development in 2017. Additional exploration and appraisal drilling is also planned on the block.

Gulf of Mexico: Approximately 20% of the capitalized well costs in excess of one year relates to an appraisal well in the northern portion of the Shenzi Field (Hess 28% participating interest) in the Gulf of Mexico, where hydrocarbons were encountered in the fourth quarter of 2015. The operator is evaluating plans for developing this area of the field.

JDA: Approximately 5% of the capitalized well costs in excess of one year relates to the JDA in the Gulf of Thailand (Hess 50%) where hydrocarbons were encountered in three successful exploration wells drilled in the western part of Block A-18. The operator is currently evaluating results and formulating future drilling plans in the area.