Armstrong Oil & Gas announced in late February 2020 that it had acquired a 72% interest in Borealis Alaska's Castle West prospect in the National Petroleum Reserve â Alaska (NPR-A), through its subsidiary North Slope Energy. Borealis owns 18 leases covering 205,966 ac (834 sq km) in the Nanushuk play fairway. Armstrong farmed into eight of those leases covering 91,521 ac (370 sq km) along the far western edge of Borealis' acreage: leases AA093758 â AA093765.  The Castle West acreage is directly east of the eastern edge of the 85 leases Armstrong picked up in the recent NPR-A sale held by the Bureau of Land Management (BLM) in December 2019. It is also directly southwest of the Willow oil discovery operated by ConocoPhillips.
Armstrong O&G announced that it had acquired a 72% interest in Borealis Alaskas Castle West prospect in the National Petroleum Reserve (AA093758 â AA093765).