43 C.F.R. § 3510.20

Do I have to pay a fee to modify my existing lease or obtain a fringe acreage lease?

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Yes. Before BLM issues a new fringe acreage lease or modifies your existing lease, you must pay a bonus in an amount we will determine based on an appraisal or other appropriate means. The bonus cannot be less than $1 per acre or fraction of an acre.