Occidental assesses properties for impairments based on several factors, including the availability of funds for future exploration and development activities, favorable or unfavorable land development plans, the current and projected political and regulatory climate, and the remaining lease term for the properties. If an impairment is detected, Occidental will determine whether a comparable transaction or implied acreage valuation is available and adjust the carrying amount of the unproved property to its fair value using the market approach. If there are no unproven reserves, the impairment based on estimates based on estimates based on future