30 U.S.C. § 31 — Oath: agent or attorney in fact, beyond district of claim

This section explains who can swear the oath for an adverse claim under section 30. Normally you'd expect the adverse claimant to swear it personally. But the law allows a duly authorized agent or attorney in fact to swear it instead — as long as that person actually knows the facts being sworn to. It also covers what happens if the adverse claimant is far away. If the claimant is living outside, or is currently outside, the limits of the district where the mining claim sits, the claimant doesn't have to travel back. Instead, the claimant can swear the oath in front of the clerk of any U.S. court of record, or any state or territorial court of record, in whatever state or territory the claimant happens to be in. The claimant can also swear the oath before any notary public in that state or territory.