The US federal government has appealed a court decision that blocked oil drilling in an Alaska area designated for caribou protection, according to a report by KNBA.

The appeal marks the latest turn in a long-running dispute over development rights on Alaska's North Slope, where operators have sought access to state and federal acreage that overlaps with calving grounds for caribou herds.

The underlying case concerns leasehold interests in land set aside for conservation purposes. A lower court ruled against drilling in the protected area, and the federal government has now moved the dispute to a higher court for review.

The stakes are significant for Alaska's oil industry, which depends on North Slope throughput to keep the Trans-Alaska Pipeline System operating at economic volumes. Producers and state officials have repeatedly argued that new development is needed to offset declining production from legacy fields.

Watch item: the appellate court's briefing schedule and any administrative-lease actions by federal agencies while the appeal is pending.