43 CFR §3251.14

1. (a)You must not start any exploration operations on BLM-managed lands until we approve your bond. You may meet the requirement for an exploration bond in two ways:
   1. (1)If you have an existing nationwide or statewide oil and gas exploration bond, provide a rider in an amount we have specified to include geothermal resources exploration operations; or
   2. (2)If you must file a new bond for geothermal exploration, the minimum amounts are:
      1. (i)$5,000 for a single operation;
      2. (ii)$25,000 for all of your operations within a state; and
      3. (iii)$50,000 for all of your operations on public lands nationwide.
2. (b)See subparts 3214 and 3215 for additional details on bonding procedures.