43 C.F.R. § 5441.1-1
Sealed bids shall be accompanied by a deposit of not less than 10 percent of the appraised value of the timber or other vegetative resources. For offerings at oral auction, bidders shall make a deposit of not less than 10 percent of the appraised value prior to the opening of the bidding. The authorized officer may, in his or her discretion, require larger deposits. Deposits may be in the form of cash, money orders, bank drafts, cashiers or certified checks made payable to BLM, or bid bonds of a corporate surety shown on the approved list of the United States Treasury Department or any guaranteed remittance approved by the authorized officer. Upon conclusion of the bidding, the bid deposits of all bidders, except the high bidder, will be returned. The deposit of the successful bidder will be applied to the purchase price at the time the contract is signed by the authorized officer unless the deposit is a corporate surety bid bond, in which case the surety bond will be returned to the purchaser. If BLM fails to award the timber sale within 90 days of the determination of the high bidder, a portion of the bid deposit may be refunded to the high bidder upon written request to the authorized officer, such that BLM retains a deposit of at least 5% of the appraised value. The remainder of the full bid deposit must be resubmitted to BLM once the high bidder is notified in writing that the delay of award has been remedied and the authorized officer is prepared to issue the contract. If the high bidder is unable to provide the full amount of the bid deposit within 30 days of the written notification, the sale will be re-auctioned and the high bidder will be barred from participating in any subsequent auctions for the same tracts.
43 C.F.R. §5441.1-1