43 CFR § 3861.2-4 - Supplemental proof of expenditures and improvements.

---
identifier: "/us/cfr/t43/s3861.2-4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "43 CFR § 3861.2-4 - Supplemental proof of expenditures and improvements."
title_number: 43
title_name: "Public Lands: Interior"
section_number: "3861.2-4"
section_name: "Supplemental proof of expenditures and improvements."
chapter_name: "BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR"
subchapter_number: "C"
subchapter_name: "MINERALS MANAGEMENT (3000)"
part_number: "3860"
part_name: "MINERAL PATENT APPLICATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 22  31 U.S.C. 9701; 43 U.S.C. 1701"
cfr_part: "3860"
---


# 3861.2-4 Supplemental proof of expenditures and improvements.

If the value of the labor and improvements upon a mineral claim is less than $500 at the time of survey the mineral surveyor may file with the cadastral engineer supplemental proof showing $500 expenditure made prior to the expiration of the period of publication.