All mining related activities, including exploration authorized under 43 CFR 3809 as either a notice or plan of operations is required to have a financial guarantee (bond) as per 43 CFR 3809.500. Various instruments maybe available to meet this requirement, depending on the type of mining activity proposed.
As an example, surety bonds, cash bonds in several forms, or participation in the State of Alaska's Bonding Pool are accepted by the BLM. Other options may be available as well. Most gold placer mines and exploration projects in Alaska participate in the bonding pool, as it is commonly found to be the least expensive and most convenient alternative.
For more information use of the bonding pool, and to obtain the required forms go to the State of Alaska, Department of Natural Resources' website.