Pioneer Natural Resources is a top-tier U.S. independent exploration and production company with total proved reserves equivalent to 4.4 trillion cubic feet of gas or 737 million barrels of oil. Pioneer operates in the U.S., Canada, Argentina and three countries in Africa. Pioneer’s reserves are equally balanced between gas and liquids and offer a longer than average productive life with a reserves-to-production ratio of 18 years. Powering the Company are core properties that stand out as some of the best in the industry. Pioneer’s primary growth engine is exploration. Multiple discoveries have been made in the Gulf of Mexico, South Africa and Gabon, adding significant proved reserves and the potential for 45 percent production growth during 2003.