43 C.F.R. § 3832.31

What is a mill site?

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A mill site is a location of nonmineral land not contiguous to a vein or lode that you can use for activities reasonably incident to mineral development on, or production from, the unpatented or patented lode or placer claim with which it is associated.

(a) A dependent mill site is used for activities that support a particular patented or unpatented lode or placer mining claim or group of mining claims.

(b) An independent or custom mill site—

(1) Is not dependent on a particular mining claim but provides milling or reduction processing for nearby lode mines or a lode mining district;

(2) Is used to mill, process, and reduce either—

(i) Ores for other miners on a contractual basis; or

(ii) Ores that are purchased by the independent or custom mill site owner.

(3) You may not have a custom or independent mill site for processing materials from placer mining claims.

Notes of Decisions

Cited in 3 cases (1 in the last 5 years), 2014–2024 · leading case: Earthworks v. DOI, 105 F.4th 449 (D.C. Cir. 2024).

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Earthworks v. DOI, 105 F.4th 449 (D.C. Cir. 2024). “§ 42 ; see 43 C.F.R. § 3832.31 . This case requires us to determine whether the Mining Law limits mill-site land to a total of five acres per mining claim; or whether it allows a mining claimant to acquire an infinite number of five-acre mill sites, thereby imposing no real…”

Reoforce, Inc. v. United States, 118 Fed. Cl. 632 (Fed. Cl. 2014). “” 43 C.F.R. § 3832.31 . 7 . This was contrary to other testimony.”

Earthworks v. U.S. Dep't of the Interior (D.D.C. 2020). “; see also 43 C.F.R. § 3832.31 (noting that a mill site can be used “for activities reasonably incident to mineral development on, or production from, the unpatented or patented lode or placer claim with which it is associated”).”

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