A report commissioned by a conservation group, LNE Engineering and Policy, has stated that the state's proposed 211-mile Ambler Road to a mineral district in Northwest Alaska will cost more than $2 billion, potentially an underestimate based on construction estimates for other remote and lengthy Alaska road proposals. The report criticizes the project's financing plan, stating that potential mine developers have not committed to fully reimbursing AIDEA and are likely to negotiate tolls that are as low as possible. The cost of construction alone would cost $765 million, but other costs, such as financing, and maintenance over 50 years, could add an additional $1.3 billion. The project developer, Alaska Industrial Development and Export Authority, has proposed issuing bonds to pay for the road and would repay them by assessing fees on mining companies that would use the road.