United States Court of Appeals
FOR THE DISTRICT OF COLUMBIA CIRCUIT
Argued February 12, 2026 Decided March 31, 2026
No. 24-1293
SECRETARY OF LABOR, M INE SAFETY AND HEALTH
ADMINISTRATION,
PETITIONER
v.
KNIGHT HAWK COAL , LLC AND FEDERAL M INE SAFETY AND
HEALTH REVIEW COMMISSION ,
RESPONDENTS
Consolidated with 24-1356, 25-1077
No. 24-1294
SECRETARY OF LABOR, M INE SAFETY AND HEALTH
ADMINISTRATION,
PETITIONER
v.
CRIMSON O AK GROVE R ESOURCES LLC, ET AL .,
RESPONDENTS
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Consolidated with 24-1357
On Petitions for Review of Decisions of the
Federal Mine Safety and Health Review Commission
Susannah M. Maltz, Attorney, U.S. Department of Labor,
argued the cause for petitioner. With her on the briefs were
Jonathan L. Snare, Acting Solicitor of Labor, at the time the
brief was filed, and Jonathan Berry, Solicitor of Labor. Daniel
J. Aguilar and Michael S. Raab, Attorneys, U.S. Department of
Justice, entered appearances.
Soren J. Schmidt, appointed by the court, argued the cause
as amicus curiae in support of the orders below. With him on
the briefs was Patrick D. Powers. Gregory G. Garre entered
an appearance.
Before: HENDERSON, CHILDS and PAN, Circuit Judges.
Opinion for the Court filed by Circuit Judge HENDERSON.
KAREN LE CRAFT HENDERSON, Circuit Judge: The
Secretary of the Department of Labor (Labor) issued citations
to mine operators in the eleven disputes that underlie these
petitions. The operators contested the citations before the
Federal Mine Safety and Health Review Commission
(FMSHRC or Commission), the adjudicative body responsible
for reviewing the Secretary’s citations and penalties. Then, in
filings labeled either motions to settle or motions to dismiss,
the Secretary sought to modify the citations. In some cases, the
Secretary sought to reduce the proposed penalty while
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removing one or more “significant and substantial” (S&S)
designations—essentially findings that the violations were
especially serious. In others, the Secretary sought to vacate
some, but not all, of the citations she had issued to an operator.
The Secretary declined to explain her S&S removals and
citation vacaturs. Emphasizing that lack of explanation,
Commission administrative law judges (ALJs) denied the
Secretary’s motions to settle or dismiss. The Commission
granted interlocutory review and affirmed. It explained that
section 110(k) of the Mine Act, 30 U.S.C. § 820(k),
constrained the Secretary’s discretion to modify or settle
contested penalties. From those nonfinal orders, the Secretary
filed these petitions for review.
Ordinarily, we possess jurisdiction to review only final
Commission orders. Conceding that the orders here are
nonfinal, the Secretary nevertheless contends that they are
immediately appealable under the collateral-order doctrine.
We conclude that they are not. Requiring the Secretary to await
a final decision will not imperil a substantial public interest.
Hence, the orders will be effectively reviewable after a final
decision and we lack jurisdiction to consider them now.
I. BACKGROUND
A
In the Federal Mine Safety and Health Amendments Act
of 1977 (Mine Act), Pub. L. No. 95-164, 91 Stat. 1290, the
Congress created a split-enforcement scheme to promote the
safety of the mining industry’s “most precious resource—the
miner,” 30 U.S.C. § 801(a). The Labor Secretary, as well as
the Mine Safety and Health Administration (MSHA) that she
directs, exercises enforcement and policymaking powers.
Sec’y of Lab. v. Twentymile Coal Co., 456 F.3d 151, 160–61
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(D.C. Cir. 2006). To that end, the Act requires the Secretary to
promulgate “health or safety standards,” 30 U.S.C. § 811(a),
and to inspect mines for compliance with those standards, id.
§ 813(a). Meanwhile, the Act charges the FMSHRC with
resolving disputes arising under it. Twentymile Coal Co., 456
F.3d at 152. The Commission is an adjudicative entity
comprising five commissioners appointed by the President. 30
U.S.C. § 823(a). The Commission appoints ALJs to issue
initial decisions. Id. § 823(d)(1). A party aggrieved by an ALJ
decision may seek review from the Commission and,
ultimately, the courts. Id. §§ 816(a)(1), 823(d)(2)(A)(i).
If, after inspecting a mine, the Secretary determines that
the mine is noncompliant, she issues a citation. 30 U.S.C.
§ 814(a). Upon learning of the citation, the mine operator may
request a “safety and health conference” to submit mitigating
information. 3 Mine Safety & Health Admin., Program Policy
Manual § 100.6, at 104 (2013). After the meeting, and barring
resolution of the citation, the Secretary issues a “notice of
proposed penalty.” 30 C.F.R. § 100.7(a). The notice imposes
a monetary penalty for the alleged violation. See id. § 100.3(a);
3 Mine Safety & Health Admin., supra, § 100.7(a), at 107–08.
She calculates the amount on the basis of six factors, including
the operator’s negligence, the operator’s record of previous
violations and the violation’s gravity. 30 C.F.R. § 100.3(a)(1).
Some violations of the Act’s health and safety standards
are more serious than others. Reflecting as much, the Act
authorizes the Secretary to identify and designate violations
that could “significantly and substantially contribute to the
cause and effect of a coal or other mine safety or health
hazard.” 30 U.S.C. § 814(d)(1). These are deemed “S&S”
violations. An S&S violation “is a precondition for enhanced
enforcement actions,” Cumberland Coal Res., LP v. FMSHRC,
717 F.3d 1020, 1022 (D.C. Cir. 2013), and can carry severe
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consequences. For example, a consistent pattern of S&S
violations may trigger a temporary partial mine closure. 30
U.S.C. § 814(e)(1).
Within thirty days of receiving the notice of proposed
penalty, the mine operator must either pay the penalty or notify
the Secretary of its intent to contest the penalty before the
Commission. 30 C.F.R. § 100.7(b). If the operator opts to
contest the penalty, the parties proceed to a hearing before a
Commission ALJ. See 30 U.S.C. §§ 820(i), 823(d); 29 C.F.R.
§ 2700.51. After considering evidence, the ALJ evaluates all
proposed penalties de novo “according to six criteria,”
reflecting the criteria that the Secretary uses to calibrate the
initial penalty. Thunder Basin Coal Co. v. Reich, 510 U.S. 200,
208 & n.10 (1994). Those criteria are:
[T]he operator’s history of previous violations,
the appropriateness of such penalty to the size
of the business of the operator charged, whether
the operator was negligent, the effect on the
operator’s ability to continue in business, the
gravity of the violation, and the demonstrated
good faith of the person charged in attempting
to achieve rapid compliance after notification of
a violation.
30 U.S.C. § 820(i). The ALJ also assesses any S&S
designations. See 29 C.F.R. § 2700.21(b); e.g., Sec’y of Lab.
v. Consolidation Coal Co., 6 FMSHRC 189, 192–95 (1984).
Commission review is discretionary. 30 U.S.C.
§ 823(d)(2)(A)(i). Because the Commission alone possesses
the authority “to impose civil penalties proposed by the
Secretary,” Thunder Basin, 510 U.S. at 208, any penalty finally
imposed constitutes the decision “of the Commission,” 30
U.S.C. § 815(a).
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In lieu of a hearing, the parties may instead agree to settle
or reduce the proposed penalty. If they do, they must obtain
the Commission’s approval. Under section 110(k) of the Mine
Act, “No proposed penalty which has been contested before the
Commission under section 815(a) of this title shall be
compromised, mitigated, or settled except with the approval of
the Commission.” 30 U.S.C. § 820(k). The meaning of that
provision is the crux of these petitions.
B
The petitions for review are based on eleven pending
contests. They raise two principal issues on the merits, both
involving the Secretary’s authority to vacate citations and
remove S&S designations without explanation as part of a
settlement agreement. For ease of reference, we categorize the
five petitions by issue and refer to them by the lead case
presenting each issue.
First are the Knight Hawk Coal petitions. The petitions
stemmed from three contests in which the Secretary requested
permission to settle contested citations and, under the
settlement agreements, proposed to remove S&S designations
from some citations. In Knight Hawk Coal, for example, a
MSHA inspector issued five S&S citations to Knight Hawk
Coal, the operator of an underground mine in Southern Illinois.
Knight Hawk Coal contested three of the citations. The parties
then requested permission to settle. Under the proposed
settlement agreement, the Secretary would remove two S&S
designations, reduce the “likelihood of injury” from
“Reasonably Likely” to “Unlikely” for two citations and reduce
the proposed penalty by more than $3,000. No. 24-1293, J.A.
37–39. Knight Hawk Coal would, in turn, pay the penalty
associated with the third citation without contest.
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The ALJ rejected the settlement agreement. In his view,
the Secretary failed to explain adequately her decision to
remove one S&S designation. At the Secretary’s request, the
ALJ certified his decision for interlocutory review and the
Commission affirmed, concluding that section 110(k) required
the Secretary to “provide sufficient reasoning and justification
to support the removal of an S&S designation in a settlement
motion.” Sec’y of Lab. v. Knight Hawk Coal, LLC, 46
FMSHRC 563, 566 (2024). One commissioner dissented,
contending that the question “whether a violation should be
designated S&S is a fact-based inquiry requiring the exercise
of prosecutorial discretion” and is entrusted exclusively to the
Secretary. Id. at 589 (Althen, Comm’r, dissenting).
Second are the two Crimson Oak Grove petitions, arising
from eight ALJ orders. In six orders, the ALJ denied the
Secretary’s motions to settle or dismiss and certified questions
for interlocutory review in five of the orders, which the
Commission consolidated. In the remaining two, the ALJ
initially granted stays pending Commission review of the
certified questions before ultimately denying the Secretary’s
requests to settle.
In Crimson Oak Grove, a MSHA inspector issued citations
to Crimson Oak Grove Resources, which operates an
underground coal mine in Alabama. Crimson Oak Grove
contested two citations and one order. The Secretary moved to
dismiss, explaining that she had vacated one citation and that
Crimson Oak Grove had agreed to pay the remaining penalties
without contest. The Secretary declined to explain the
modifications.
The ALJ treated the motion as a request for permission to
settle and denied it, citing the Secretary’s lack of explanation.
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On interlocutory review, the Commission affirmed. Sec’y of
Lab. v. Crimson Oak Grove Res. LLC, 46 FMSHRC 593
(2024). It acknowledged that the Secretary’s nonenforcement
decisions are generally unreviewable. Id. at 599. But it
determined that “section 110(k) provides an exception to th[at]
general rule,” id. at 600, requiring the Commission to “review
the vacat[ur] of citations when done in the context of a
settlement,” id. at 594. Again, one commissioner dissented,
asserting that the Commission’s decision arrogated the
Secretary’s prosecutorial discretion to itself. Id. at 608–09
(Althen, Comm’r, dissenting).
The Secretary filed timely petitions for review, which we
consolidated in two related dockets. The Commission did not
file briefs or present argument in defense of its orders. We thus
appointed Soren J. Schmidt as amicus curiae to defend the
orders and he has quite ably discharged his responsibilities.
II. ANALYSIS
The parties first dispute our jurisdiction. Amicus argues
that the petitions lack Article III adverseness because the
Commission has not defended its orders before this Court and
the Secretary and operators agree on every legal issue, as well
as the relief sought. He also contends that we lack appellate
jurisdiction of the Commission’s orders because they are
nonfinal. For her part, the Secretary maintains that the petitions
satisfy Article III and that they are immediately appealable
because the Commission’s orders undermine her prosecutorial
discretion and, hence, the separation of powers. We agree with
Amicus that we lack appellate jurisdiction and so do not address
adverseness. Sinochem Int’l Co. v. Malay. Int’l Shipping
Corp., 549 U.S. 422, 431 (2007) (“A federal court has leeway
to choose among threshold grounds for denying audience to a
case on the merits.” (citation modified)); see, e.g., Wis. Voters
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All. v. Harris, 28 F.4th 1282, 1284 (D.C. Cir. 2022) (declining
to consider Article III standing upon finding no appellate
jurisdiction).
Under section 106(b) of the Mine Act, we have jurisdiction
to review only final orders. 30 U.S.C. § 816(b). Although the
statutory text admits of no exceptions, we have extended the
collateral-order doctrine’s gloss on finality to the Mine Act,
permitting immediate review of orders that satisfy the doctrine.
Meredith v. FMSHRC, 177 F.3d 1042, 1050–51 (D.C. Cir.
1999). An order constitutes an immediately appealable
collateral order if it “conclusively determine[s] the disputed
question, resolve[s] an important issue completely separate
from the merits of the action, and [is] effectively unreviewable
on appeal from a final judgment.” Coopers & Lybrand v.
Livesay, 437 U.S. 463, 468 (1978); accord Sec’y of Lab. v.
Indus. TurnAround Corp. (ITAC), 138 F.4th 1339, 1343 (D.C.
Cir. 2025). The focal point is “the entire category to which a
claim belongs.” Mohawk Indus., Inc. v. Carpenter, 558 U.S.
100, 107 (2009) (citation modified).
Most relevant here is the third prong—effective
nonreviewability. An order is “effectively unreviewable” if
“delaying review until the entry of final judgment would
imperil a substantial interest or some particular value of a high
order.” Mohawk Indus., 558 U.S. at 107 (citation modified).
Said another way, the third prong asks the court to weigh “the
value of the interests that would be lost through rigorous
application of a final judgment requirement.” Digit. Equip.
Corp. v. Desktop Direct, Inc., 511 U.S. 863, 878–79 (1994). It
follows that an order is not “effectively unreviewable” simply
because the order imposes burdens that “are only imperfectly
reparable by appellate reversal.” Id. at 872.
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In recent years, the Supreme Court has repeatedly declined
to “expand the ‘small class’ of collaterally appealable orders,”
preferring instead to keep “it narrow and selective in its
membership.” Will v. Hallock, 546 U.S. 345, 350 (2006). As
it has explained, the collateral-order doctrine “must never be
allowed to swallow the general rule that a party is entitled to a
single appeal, to be deferred until final judgment has been
entered.” Mohawk Indus., 558 U.S. at 106 (citation modified).
For that reason, both “the Supreme Court and this court have
routinely required litigants to wait until after final judgment to
vindicate valuable rights.” O’Connell v. U.S. Conf. of Cath.
Bishops, 134 F.4th 1243, 1257 (D.C. Cir. 2025) (citation
modified).
As we observed last term, the “separation of powers” is
one value that can justify immediate review. ITAC, 138 F.4th
at 1344. Nevertheless, we have viewed claims that the
separation of powers warrants immediate review with a
cautious eye. For example, in Doe v. Exxon Mobil Corp., 473
F.3d 345 (D.C. Cir. 2007), we explained that, “outside the
context of immunity,” “a defendant is not entitled to an appeal
from a district court order denying a motion to dismiss based
on the separation of powers,” id. at 351–52. Without fully
defining the category, we signaled that the caselaw’s nod to the
separation of powers was aimed at immunities—specifically,
absolute, qualified and sovereign immunity or something
comparable. Id. at 350–52. As a consequence, we explained
elsewhere, the lion’s share of “separation-of-power claims” are
“clearly not” immediately appealable. O’Connell, 134 F.4th at
1259 (quoting United States v. Cisneros, 169 F.3d 763, 769
(D.C. Cir. 1999)).
The Secretary has not shown that her authority to dismiss,
modify or settle citations she has issued implicates an interest
that is in any sense comparable to a sovereign’s immunity from
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suit. At most, the Secretary will have to litigate disputes that
she would prefer to no longer litigate. But a preference to avoid
the burdens or inconvenience of litigation does not justify
immediate review. United States v. Fokker Servs. B.V., 818
F.3d 733, 748 (D.C. Cir. 2016). And the “mere identification
of some interest that would be irretrievably lost”—like the
Secretary’s wish to modify or vacate citations via settlement
agreement here—“has never sufficed to meet” the third prong.
Digit. Equip., 511 U.S. at 872 (citation modified).
Nor, for that matter, would delaying review “destroy[]” the
“legal and practical value” of the Secretary’s prosecutorial
authority under the Mine Act. Lauro Lines s.r.l. v. Chasser,
490 U.S. 495, 498–99 (1989) (citation modified). The
Secretary retains substantial discretion to direct the course of
the proceedings. To give just one example: Although the
Commission denied the Secretary’s motions to settle, Amicus
concedes (and earlier in the proceedings, the Commission did
not dispute) that the Secretary could unconditionally dismiss
any of the pending contests. That measure of autonomy
reinforces our belief that the Commission’s orders do not
imperil any substantial public interest and so they are
effectively reviewable after a final order.
The Secretary has one principal response—she points to
caselaw in which other circuits permitted immediate appeals
under the Occupational Safety and Health (OSH) Act, 29
U.S.C. § 651 et seq. As the Secretary underscores, other
circuits have exercised collateral-order jurisdiction when the
Occupational Safety and Health Review Commission
(OSHRC) denied the Secretary permission to vacate or settle
citations. E.g., Donovan v. OSHRC, 713 F.2d 918, 923–24 (2d
Cir. 1983); Marshall v. OSHRC, 635 F.2d 544, 549 (6th Cir.
1980). But those decisions do not alter our analysis, for several
reasons.
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To begin with, the Secretary’s cited cases are
distinguishable because they involved a different statutory
scheme. Although the OSH Act and Mine Act are comparable
in many respects, Twentymile Coal Co., 456 F.3d at 160–61,
they are not identical. Most importantly, the Mine Act gives
the Commission some discretionary authority to review and
approve the Secretary’s proposed settlement agreements. 30
U.S.C. § 820(k). The OSH Act lacks any comparable
provision. See 29 U.S.C. § 655(e); Oil, Chem. & Atomic
Workers Int’l Union v. OSHRC, 671 F.2d 643, 650 (D.C. Cir.
1982) (describing the Secretary’s settlement and dismissal
authority under the OSH Act). Although we must set aside our
views of the merits when applying the collateral-order doctrine,
Lauro Lines, 490 U.S. at 501, we need not prejudge the merits,
nor definitively construe the scope of section 110(k), to observe
that the Mine Act and OSH Act are simply not comparable in
this regard. The Secretary may in some cases have a
compelling separation-of-powers argument under the OSH
Act; her argument here is not as weighty.
Moreover, the Secretary’s cited caselaw is a poor fit with
our precedent. The decisions she relies on rested primarily on
two grounds: (1) that the Commission and Secretary were at
loggerheads and (2) that their disagreement raised an important
issue that was in the public interest to resolve. See Donovan,
713 F.2d at 924–25; Marshall, 635 F.2d at 549. But her
asserted public interest here is the separation of powers and, as
we have explained, our circuit has established a high bar for
parties relying on that interest to obtain immediate review. We
have also recognized that the mere fact of disagreement
between the Secretary and Commission does not warrant
immediate review. ITAC, 138 F.4th 1339. Given that
precedent, we would have to do more shoehorning than
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tolerable to import and extend the Secretary’s cited caselaw to
the Mine Act.1
Finally, the Secretary’s cited cases predate the Supreme
Court’s efforts to narrow the collateral-order doctrine. Those
decisions were issued in the 1980s and the Supreme Court’s
endeavor to tighten the screws on the doctrine did not begin in
earnest until, roughly speaking, the end of that decade. See
Swint v. Chambers Cnty. Comm’n, 514 U.S. 35, 48 (1995)
(tying the narrowing of the doctrine to rulemaking powers
Congress conferred in 1990 and 1992); Mohamed v. Jones, 100
F.4th 1214, 1227 (10th Cir. 2024) (noting the doctrine’s
“expansion” era culminated in 1985). None of this suggests
that the Secretary’s cited cases are bad law. But it does suggest
caution before using those cases in a new context.
In sum, we hold that the Secretary’s interest in unilaterally
vacating citations and removing S&S designations via post-
contest settlement agreements is adequately safeguarded by a
final order. Delaying review will not “imperil a substantial
public interest or some particular value of a high order.”
Mohawk Indus., 558 U.S. at 107 (citation modified).
With her frontline argument disposed of, the Secretary
turns next to pragmatic concerns. She maintains that she will
1 The Secretary emphasizes that the ITAC Court suggested
it would reach a different conclusion if the orders there had
implicated the separation of powers. True enough. See ITAC,
138 F.4th at 1344. But we said nothing in ITAC to undercut
our earlier observation that most separation-of-powers
arguments do not warrant immediate review. Cisneros, 169
F.3d at 769. There are more and less compelling separation-
of-powers interests; here, the Secretary’s is not one of the more
compelling ones.
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be unable to present fully her argument following a final
decision. Specifically, she emphasizes that she might prevail
on the merits in all eleven disputes, depriving her of appellate
standing and rendering the Commission’s interlocutory orders
effectively unreviewable. We are unpersuaded. As a general
matter, prevailing on the merits is always a possibility in
litigation. For that reason, a chance of success on the merits,
and the loss of appellate standing threatened thereby, is
typically not enough to warrant immediate review: “[T]he
worrisome prospect of victory . . . is one with which parties
will have to live.” Wajnstat v. Oceania Cruises, Inc., 684 F.3d
1153, 1157 (11th Cir. 2012); accord 15A Wright & Miller’s
Federal Practice & Procedure § 3911.3 (3d ed. Sep. 2025
update).2 In any case, even if the Secretary believes that she
would run the table, there are paths available to her that could,
in our view, permit her to present her argument without
prosecuting the citations.
2 Different considerations may obtain if an agency seeks
to challenge the legal standard announced in a court order
remanding a matter to the agency, Occidental Petrol. Corp. v.
SEC, 873 F.2d 325, 331–32 (D.C. Cir. 1989), or when the
prosecutor in a criminal case seeks to appeal from the denial of
a motion to dismiss pending charges, see United States v.
Dupris, 664 F.2d 169, 173–74 (8th Cir. 1981). In both
instances, the government generally lacks the authority to
appeal a final order. Occidental, 873 F.2d at 330, 332; Fokker
Servs. B.V., 818 F.3d at 748. And double jeopardy
considerations, as well as an express statutory backdrop,
further complicate any analogy to criminal prosecution. 18
U.S.C. § 3731; 15A Wright & Miller, supra, § 3919.5
(“Double jeopardy principles dominate the law of government
appeals.”).
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First, the Secretary could seek a writ of mandamus. In re
Khadr, 823 F.3d 92, 97 n.2 (D.C. Cir. 2016) (“[M]andamus still
remains available to review certain interlocutory orders.”).
Without opining on the availability or propriety of that relief
here, we note that there is precedent recognizing mandamus
relief against adjudicative entities, or agencies acting in an
adjudicative capacity. See, e.g., In re Perry, 859 F.2d 1043,
1046, 1050 (1st Cir. 1988) (finding mandamus relief
appropriate as to the OSHRC); Cmty. Broad. of Bos., Inc. v.
FCC, 546 F.2d 1022, 1028 (D.C. Cir. 1976) (per curiam)
(suggesting mandamus would be available to review an FCC
attorney-disqualification order “[i]n the exceptional case”). As
a conceptual matter, mandamus relief against the Commission
fairly aligns with the writ’s traditional office—confining a
“lower court to the sphere of its discretionary power.” Will v.
United States, 389 U.S. 90, 104 (1967); accord In re Justs. of
the Sup. Ct. of P.R., 695 F.2d 17, 25 (1st Cir. 1982) (Breyer,
J.). And mandamus would also cohere with the Supreme
Court’s oft-repeated instruction to proceed, if necessary, via
petition for writ of mandamus rather than seek to extend the
collateral-order doctrine. E.g., Mohawk Indus., 558 U.S. at
111; Firestone Tire & Rubber Co. v. Risjord, 449 U.S. 368, 378
n.13 (1981).
The Secretary may also obtain effective review of the
settlement denials as a respondent. If the Secretary prevails on
the merits before the Commission, the operator will likely
petition for review. In that event, the Secretary could assert
that the Commission exceeded its authority in denying the
parties’ proposed settlement agreement. See Ingalls
Shipbuilding, Inc. v. Dir., Off. of Workers’ Comp. Programs,
519 U.S. 248, 269–70 (1997). These mechanisms confirm for
us that we need depart neither from the text of section 106(b)
nor from the traditional rules of appellate jurisdiction in this
case.
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* * *
Because we lack appellate jurisdiction of the
Commission’s nonfinal orders, we dismiss the Secretary’s
petitions for review.
So ordered.
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