Canadian Natural Resources Ltd. is an oil and natural gas production company, which engages in the exploration, development, marketing, and production of crude oil and natural gas. The company is headquartered in Calgary, Alberta and currently employs 10,640 full-time employees. The company went IPO on 2000-07-31. The firm has operations in its core areas located in Western Canada, the United Kingdom portion of the North Sea and Offshore Africa. Its Oil Sands Mining and Upgrading segment produces synthetic crude oil through bitumen mining and upgrading operations at Horizon Oil Sands (Horizon) and through the Company's direct and indirect interest in the Athabasca Oil Sands Project (AOSP). Within Western Canada in the Midstream and Refining segment, the Company maintains certain activities that include pipeline operations, an electricity co-generation system and an investment in the North West Redwater Partnership (NWRP), a general partnership formed to upgrade and refine bitumen in the Province of Alberta. Its Pelican Lake asset is a large, contiguous, shallow, medium crude oil pool. The company produces natural gas in western Canada and has a significant land base in both the Montney and Deep Basin.