In this case we decide whether, after notifying a Black Lung Benefits Act claimant that benefits have been denied pursuant to 20 C.F.R. Sec. 725.410(c), the Department of Labor (DoL) must send to the claimant an additional denial notice pursuant to 20 C.F.R. Sec. 725.409(b) before considering the claim abandoned. We hold that no such additional notice is required.

Petitioner Carl Adkins filed a claim for benefits under the Black Lung Benefits Act in June 1973. His claim was denied three times by the Social Security Administration and was referred to the DoL in April 1979. After consideration of Adkins' claim, the DoL denied it on October 8, 1980, and sent Adkins a denial letter in which Adkins was advised that he had sixty days either to submit additional evidence or to request a formal hearing. The letter stated: "If you do not take any action within 60 days, your claim will be considered abandoned." The letter also informed Adkins that he could request reconsideration of the denial within one year if his condition changed or a mistake had been made.

Adkins did nothing further until February 5, 1982, when he made an inquiry through counsel as to the status of his claim. The DoL informed him that the claim was considered "administratively closed" as a result of his inaction.

Thereafter, Adkins requested and received a formal hearing before an Administrative Law Judge (ALJ). At the hearing, Adkins conceded that the October 8, 1980, claim denial letter sent to him by the DoL fully satisfied the requirements for such a letter as set forth in 20 C.F.R. Sec. 725.410(c).1 He argued, however, that in order for his claim to become abandoned after his receipt of the denial letter, the DoL must first comply with the additional procedural requirements of 20 C.F.R. Sec. 725.409.2 He contended that these procedural requirements were incorporated into Sec. 725.410(c)(1) by the parenthetical reference at the end of that provision. Adkins asserted that the Director's interpretation of the two regulations--that they addressed different situations and were not to be read in conjunction--was not reasonable.

The ALJ rejected Adkins' claim as abandoned. The Benefits Review Board affirmed this decision. Adkins now appeals the denial of his claim by reason of abandonment.

Our consideration of the issue raised in this case is guided by the recent Supreme Court decision in Mullins Coal Co. v. Director, OWCP, 484 U.S. 135, 108 S. Ct. 427, 98 L. Ed. 2d 450 (1987). In Mullins, the Court held that an agency's reasonable interpretation of its own regulation is entitled to "substantial deference" and will be sustained " 'unless it is plainly erroneous or inconsistent with the regulation.' " Id. at ----, 108 S.Ct. at 440 (quoting Bowles v. Seminole Rock & Sand Co., 325 U.S. 410, 414, 65 S. Ct. 1215, 1217, 89 L. Ed. 1700 (1945)); see Chevron U.S.A. v. Natural Resources Defense Council, Inc., 467 U.S. 837, 842-843 n. 11, 104 S. Ct. 2778, 2781-2782 n. 11, 81 L. Ed. 2d 694 (1984). Accordingly, we must determine whether the DoL's interpretation is a reasonable one, is not plainly erroneous, and is consistent with the regulations.

Adkins has made the same arguments before us as he made before the Benefits Review Board, viz., that Sec. 725.409--referred to in the parenthetical at the end of Sec. 725.410(c)(1)--placed upon the DoL a duty to send him an additional notice at the expiration of the sixty days mentioned in the October 8, 1980, Sec. 725.410 notice, at which point he would have thirty days more to respond before denial of his claim by reason of abandonment. Because no such additional notice was sent to him, he contends, his claim cannot be considered abandoned. He again asserts that the Director's interpretation of the regulations is an unreasonable one.

The Benefits Review Board directly addressed this question in Fetter v. Peabody Coal Co., 6 B.L.R. 1-1173 (1984). The Board ruled that the thirty-day period provided for in Sec. 725.409 was not intended as an additional notice requirement, and that the Sec. 725.410(c) notice period satisfied the notice requirements of both regulations. See Fetter, 6 B.L.R. at 1-1175.

This result was followed in Clark v. Director, 9 B.L.R. 1-205 (1986), which was affirmed on the point in Clark v. Director, OWCP, 838 F.2d 197 (6 Cir.1988). In the latter decision, the Sixth Circuit distinguished the two regulations by noting that Sec. 725.409 applies "where the record does not contain sufficient evidence to allow the agency to make a factual determination," while Sec. 725.410 "covers situations where there is enough evidence in the record and the appropriate agency has made its factual determination." Clark, 838 F.2d at 199-200 (emphases in original). The court accepted the Director's characterization of the cross-reference in Sec. 725.410 as merely a specification that the effect of a denial by reason of abandonment is the same under either regulation. See id. at 200.

The Director has proffered these arguments to us. In addition, the Director contends that the use of the past tense in each regulation ("shall be considered denied ") further supports the conclusions reached in Fetter and Clark.

We are persuaded by the Director's defense of his interpretation of the regulations. As the Director notes, it would indeed appear to make little sense for a claim to be "considered denied" twice. Moreover, we think that the distinction noted by the Sixth Circuit in Clark, and relied upon by the Director here, is a reasonable means of differentiating between the two regulations. We conclude, then, that the Director's interpretation is reasonable and is neither plainly erroneous nor inconsistent with the language of the regulations. Accordingly, we will not disturb the result reached by the Benefits Review Board. See Mullins, 484 U.S. at ----, 108 S.Ct. at ----.

AFFIRMED.