In an effort to reach its congressionally mandated self-sufficiency of the Valles Caldera Preserve in New Mexico by 2015, managers of the preserve are considering a substantial increase in access fees for about 25 percent of elk tags, according to the Wildlife Management Institute. Currently, bull elk permits are $25 and cow tags are $15. Under the proposal being discussed with the New Mexico Department of Game and Fish, access fees could jump to $5,000 to $7,000.