BAILEY BROWN, Senior Circuit Judge.
In both of these cases, petitioners seek reversal of the Benefits Review Board’s (Board) decisions denying them black lung benefits. Rex Ramey worked as a coal miner for forty-two years until 1976. Ross Lewis was also employed as a miner until 1976, having worked twenty-nine years in the coal mines.
An administrative law judge (ALJ) found that Ramey was entitled to invoke the 20 C.F.R. § 727.203(a)1 presumption of total disability due to pneumoconiosis because x-ray evidence demonstrated the presence of pneumoconiosis. The ALJ found, however, that the employer rebutted the presumption under 20 C.F.R. § 727.203(b)(2)2 by showing through medical evidence that Ramey was physically capable of working in the mines. The Board affirmed this decision, finding that it was supported by substantial evidence.
An AU also found that Lewis was entitled to invoke the rebuttable presumption of 20 C.F.R. § 727.203(a) based on x-ray evidence. The AU concluded, however, that the employer rebutted the presumption under both 20 C.F.R. § 727.203(b)(2)3 and § 727.203(b)(3). The AU determined that Lewis was not totally disabled for mine work by pulmonary disease, but that Lewis suffered from a totally disabling cardiac condition — a condition that the AU found did not arise in whole or in part from Lewis’ coal mine employment.
In this appeal, both petitioners claim that the AUs’ decisions are not supported by substantial evidence. The finding of an AU in a black lung case may not be set aside if it is based on substantial evidence viewing the record as a whole, even if we would have taken a different view of the evidence were we the trier of facts. Moore v. Califano, 633 F.2d 727, 729 (6th Cir. 1980). The petitioners also contend that the AUs should have considered medical and vocational evidence before determining [487]*487that the 20 C.F.R. § 727.203(a) presumption of total disability was rebutted pursuant to 20 C.F.R. § 727.203(b)(2). We conclude that the ALJs’ decisions were based on substantial evidence and that vocational evidence need not be considered. Both decisions are affirmed.
I. Ramey
A. Substantial Evidence
We must first determine, assuming at this point that vocational evidence is unnecessary, whether the AU’s determination that the presumption was rebutted is based on substantial evidence.
Dr. T.L. Wright examined Ramey on March 17, 1978, and diagnosed category 2/2 simple pneumoconiosis. Dr. Wright opined that Ramey was totally and permanently disabled “for coal mining, arduous labor, and work in a dusty environment.” A pulmonary function study (PFS) conducted by Dr. Wright revealed a forced vital capacity of 100 percent of predicted normal, a one second forced expiratory volume of 101 percent of predicted normal and maximum voluntary ventilation of 145 percent of predicted normal. The blood gas study showed p02 of 59.6 and pC02 of 36.8. The blood gas values are sufficient to invoke the presumption in 20 C.F.R. § 727.203(a).
On April 20, 1979, Dr. Harvey Page examined Ramey and diagnosed category 1/2 simple pneumoconiosis. He found that the claimant’s PFS exceeded predicted normal values and was below predicted normal levels for the maximum voluntary ventilation. Dr. Page advised Ramey against further exposure to coal mine dust. Dr. Gene Combs, a Board certified radiologist and a “B” reader,4 reviewed the x-ray taken by Dr. Page and found no evidence of pneumo-coniosis.
Dr. Richard O’Neill, a specialist in internal medicine, examined Ramey on April 26, 1979, and found that an x-ray revealed stage 1/1 simple pneumoconiosis. He opined that the PFS revealed moderate small airways disease. A blood gas study showed a p02 of 79 and pC02 of 40. Dr. O’Neill found that the blood gas study revealed mild arterial hypoxemia.
On April 26, 1979, Dr. J.E. Meyers examined Ramey and found that his x-ray did not indicate pneumoconiosis. He found that the claimant’s ventilatory studies produced normal results. Ramey’s blood gas studies revealed a p02 of 82 and pC02 of 34, and Dr. Meyers interpreted these blood gas studies as normal. Dr. Meyers opined that Ramey’s advanced age rather than a pulmonary disability prevented Ramey’s return to coal mine work. The doctor stated that “normal physical activity, in fact, appears feasible.”
A June 26, 1979, examination of Ramey conducted by Dr. Ballard Wright, a chest physician, revealed that Ramey had no “occupational pneumoconiosis or occupational lung injury.” The PFS revealed “no abnormalities.” The blood gas studies produced a resulting p02 of 77.3 and an exercise p02 of 81.8. Dr. Ballard Wright concluded that Ramey’s health was “normal.” Dr. T.R. Marshall, a Board certified radiologist, reviewed an x-ray taken by Dr. Ballard Wright and agreed that the x-ray was negative for pneumoconiosis. Dr. Benjamin Felson, a Board certified radiologist and a “C” reader, also reviewed the x-ray taken by Dr. Ballard Wright and found that it showed no evidence of pneumoconiosis.
On June 30, 1979, Dr. Frank Varney, a general practitioner, examined Mr. Ramey and found that the claimant’s x-ray revealed category 2/2 simple pneumoconiosis and concluded that Ramey should curtail his exposure to dust.
Dr. Brent Brandon, Board certified radiologist and “B” reader, read Ramey’s x-ray taken on March 6,1979, as showing a positive finding of 1/2 pneumoconiosis in the upper right and left zones. Dr. Brandon made a similar reading of an x-ray taken on July 19, 1979. On that date, he [488]*488found nodular densities in the upper right and left upper lung zones, 1/2 “q” type. Dr. Brandon advised Ramey against further dust exposure. Dr. Combs, also a Board certified “B” reader, re-read the March 6, 1979, x-ray and agreed with Dr. Brandon’s findings.
Dr. William H. Anderson, a pulmonary specialist, examined Ramey on July 30, 1979, and found category 2 simple pneumo-coniosis. Pulmonary function studies conducted by Dr. Anderson showed a vital capacity of 113.6 and a maximum voluntary ventilation of 95.57 percent of predicted normal. The one second forced expiratory volume was 104 percent of predicted normal. Blood gas studies revealed a p02 of 72 and a pC02 of 34. Dr. Anderson cautioned Ramey against further dust exposure but opined that pneumoconiosis did not impair Ramey’s functional ability to work.
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BAILEY BROWN, Senior Circuit Judge.
In both of these cases, petitioners seek reversal of the Benefits Review Board’s (Board) decisions denying them black lung benefits. Rex Ramey worked as a coal miner for forty-two years until 1976. Ross Lewis was also employed as a miner until 1976, having worked twenty-nine years in the coal mines.
An administrative law judge (ALJ) found that Ramey was entitled to invoke the 20 C.F.R. § 727.203(a)1 presumption of total disability due to pneumoconiosis because x-ray evidence demonstrated the presence of pneumoconiosis. The ALJ found, however, that the employer rebutted the presumption under 20 C.F.R. § 727.203(b)(2)2 by showing through medical evidence that Ramey was physically capable of working in the mines. The Board affirmed this decision, finding that it was supported by substantial evidence.
An AU also found that Lewis was entitled to invoke the rebuttable presumption of 20 C.F.R. § 727.203(a) based on x-ray evidence. The AU concluded, however, that the employer rebutted the presumption under both 20 C.F.R. § 727.203(b)(2)3 and § 727.203(b)(3). The AU determined that Lewis was not totally disabled for mine work by pulmonary disease, but that Lewis suffered from a totally disabling cardiac condition — a condition that the AU found did not arise in whole or in part from Lewis’ coal mine employment.
In this appeal, both petitioners claim that the AUs’ decisions are not supported by substantial evidence. The finding of an AU in a black lung case may not be set aside if it is based on substantial evidence viewing the record as a whole, even if we would have taken a different view of the evidence were we the trier of facts. Moore v. Califano, 633 F.2d 727, 729 (6th Cir. 1980). The petitioners also contend that the AUs should have considered medical and vocational evidence before determining [487]*487that the 20 C.F.R. § 727.203(a) presumption of total disability was rebutted pursuant to 20 C.F.R. § 727.203(b)(2). We conclude that the ALJs’ decisions were based on substantial evidence and that vocational evidence need not be considered. Both decisions are affirmed.
I. Ramey
A. Substantial Evidence
We must first determine, assuming at this point that vocational evidence is unnecessary, whether the AU’s determination that the presumption was rebutted is based on substantial evidence.
Dr. T.L. Wright examined Ramey on March 17, 1978, and diagnosed category 2/2 simple pneumoconiosis. Dr. Wright opined that Ramey was totally and permanently disabled “for coal mining, arduous labor, and work in a dusty environment.” A pulmonary function study (PFS) conducted by Dr. Wright revealed a forced vital capacity of 100 percent of predicted normal, a one second forced expiratory volume of 101 percent of predicted normal and maximum voluntary ventilation of 145 percent of predicted normal. The blood gas study showed p02 of 59.6 and pC02 of 36.8. The blood gas values are sufficient to invoke the presumption in 20 C.F.R. § 727.203(a).
On April 20, 1979, Dr. Harvey Page examined Ramey and diagnosed category 1/2 simple pneumoconiosis. He found that the claimant’s PFS exceeded predicted normal values and was below predicted normal levels for the maximum voluntary ventilation. Dr. Page advised Ramey against further exposure to coal mine dust. Dr. Gene Combs, a Board certified radiologist and a “B” reader,4 reviewed the x-ray taken by Dr. Page and found no evidence of pneumo-coniosis.
Dr. Richard O’Neill, a specialist in internal medicine, examined Ramey on April 26, 1979, and found that an x-ray revealed stage 1/1 simple pneumoconiosis. He opined that the PFS revealed moderate small airways disease. A blood gas study showed a p02 of 79 and pC02 of 40. Dr. O’Neill found that the blood gas study revealed mild arterial hypoxemia.
On April 26, 1979, Dr. J.E. Meyers examined Ramey and found that his x-ray did not indicate pneumoconiosis. He found that the claimant’s ventilatory studies produced normal results. Ramey’s blood gas studies revealed a p02 of 82 and pC02 of 34, and Dr. Meyers interpreted these blood gas studies as normal. Dr. Meyers opined that Ramey’s advanced age rather than a pulmonary disability prevented Ramey’s return to coal mine work. The doctor stated that “normal physical activity, in fact, appears feasible.”
A June 26, 1979, examination of Ramey conducted by Dr. Ballard Wright, a chest physician, revealed that Ramey had no “occupational pneumoconiosis or occupational lung injury.” The PFS revealed “no abnormalities.” The blood gas studies produced a resulting p02 of 77.3 and an exercise p02 of 81.8. Dr. Ballard Wright concluded that Ramey’s health was “normal.” Dr. T.R. Marshall, a Board certified radiologist, reviewed an x-ray taken by Dr. Ballard Wright and agreed that the x-ray was negative for pneumoconiosis. Dr. Benjamin Felson, a Board certified radiologist and a “C” reader, also reviewed the x-ray taken by Dr. Ballard Wright and found that it showed no evidence of pneumoconiosis.
On June 30, 1979, Dr. Frank Varney, a general practitioner, examined Mr. Ramey and found that the claimant’s x-ray revealed category 2/2 simple pneumoconiosis and concluded that Ramey should curtail his exposure to dust.
Dr. Brent Brandon, Board certified radiologist and “B” reader, read Ramey’s x-ray taken on March 6,1979, as showing a positive finding of 1/2 pneumoconiosis in the upper right and left zones. Dr. Brandon made a similar reading of an x-ray taken on July 19, 1979. On that date, he [488]*488found nodular densities in the upper right and left upper lung zones, 1/2 “q” type. Dr. Brandon advised Ramey against further dust exposure. Dr. Combs, also a Board certified “B” reader, re-read the March 6, 1979, x-ray and agreed with Dr. Brandon’s findings.
Dr. William H. Anderson, a pulmonary specialist, examined Ramey on July 30, 1979, and found category 2 simple pneumo-coniosis. Pulmonary function studies conducted by Dr. Anderson showed a vital capacity of 113.6 and a maximum voluntary ventilation of 95.57 percent of predicted normal. The one second forced expiratory volume was 104 percent of predicted normal. Blood gas studies revealed a p02 of 72 and a pC02 of 34. Dr. Anderson cautioned Ramey against further dust exposure but opined that pneumoconiosis did not impair Ramey’s functional ability to work.
The ALJ evaluated all the medical evidence and determined that Ramey suffered from a moderate degree of pneumoconiosis but that he did not have a respira- ' tory or pulmonary impairment of sufficient severity to prevent his engaging in his usual coal mine employment, and therefore, the employer had rebutted the presumption. These findings were based on substantial evidence. Substantial evidence is “more than a mere scintilla;” substantial evidence is “such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Richardson v. Perales, 402 U.S. 389, 401, 91 S.Ct. 1420, 1427, 28 L.Ed.2d 842 (1971) (quoting Consolidated Edison Co. v. NLRB, 305 U.S. 197, 229, 59 S.Ct. 206, 216, 83 L.Ed. 126 (1938)). The ALJ’s findings complied with this standard.
B. Vocational Disability
It is Ramey’s position that in order to rebut the presumption, the employer must not only establish by medical evidence that the Ramey is physically able to engage in coal mine work, but that the employer must also demonstrate that job opportunities in the coal mining industry are available to Ramey despite his occupational disease and that Ramey has a reasonable opportunity to be hired.5 The employer-respondent and the Director maintain that vocational evidence need not be considered because the employer has rebutted the presumption by demonstrating through medical evidence that Ramey’s pneumoconiosis is not disabling.
Whether a factfinder must consider vocational evidence when determining, pursuant to 20 C.F.R. § 727.203(b)(2), if an employer has rebutted the presumption by proving the claimant is “able to do his usual coal mine work” is an issue of first impression in this circuit.6 Several circuits, however, [489]*489have considered the question and have determined that such rebuttal under 20 C.F.R. § 727.203(b)(2) is solely a matter of medical evidence. Taft v. Alabama By-Products Corp., 733 F.2d 1518 (11th Cir. 1984); Director, Office of Workers’ Compensation Programs v. Beatrice Pocohontas Co., 698 F.2d 680 (4th Cir.1983). See also Sherry v. Tesone Coal Co., 4 BLR 1-377, aff'd without published opinion, 696 F.2d 985 (3d Cir.1982); Johnson v. Cannelton Industries, Inc., 2 BLR 1-1081 (1980). We agree with the result reached by these courts.
Congress enacted the Black Lung Benefits Act to provide benefits to coal miners who are totally disabled due to pneumoco-niosis. 30 U.S.C.A. § 901(a) (West Supp. 1972-1983). The Act contains two distinct compensation programs: Part B and Part C. Part B of the Act is federally financed and administered by the Social Security Administration (SSA). Part C is administered by the Department of Labor, but benefits awarded under this Part are paid by a responsible mine operator.
Upon the enactment of the Black Lung Act of 1972, interim adjudicatory rules were issued that governed Part B disability claims, which are those filed before July 1, 1973. 20 C.F.R. § 410.490. The rules were created to liberalize the black lung eligibility requirements and to facilitate prompt processing of black lung claims by the SSA. S.Rep. No. 743, 92d Cong., 2d Sess. 3, reprinted in 1972 U.S.Code Cong. & Ad.News 2305, 2307. These rules, however, were not applicable to Part C claims. 20 C.F.R. § 410.490(b). As a result, benefits were more readily paid to Part B claimants than to Part C claimants. Hearings on H.R. 3476, H.R. 8834, H.R. 8835 and H.R. 8838 before the General Subcommittee on Labor of the House Committee on Education and Labor, 93d Cong., 1st & 2d Sess. 329, 341, 349, 399 (1973-74).
In 1977, Congress amended the black lung legislation by passing the Black Lung Benefits Reform Act of 1977. The House version of the bill would have applied the SSA rules to both Part B and Part C claims. H.R.Rep. No. 4544, 95th Cong., 1st Sess. § 7(a) (1977). The Senate version of the bill, however, did not apply the SSA rules to Part C claims; instead the Senate bill authorized the Secretary of Labor to draft his own medical eligibility criteria to be used by the Department of Labor when adjudicating Part C claims. S.Rep. No. 209, 95th Cong., 1st Sess. (1977).
The Conference Committee adopted the Senate version of the bill with several provisos. The Committee agreed that the Department of Labor would promulgate regulations for the determination of total disability or death due to pneumoconiosis in Part C claims. H.R.Rep. No. 864, 95th Cong., 2d Sess. (1978), reprinted in 1978 U.S.Code Cong. & Ad.News 237, 308, 309. Both Petitioner Lewis and Petitioner Ra-mey’s Part C claims were filed during this interval between the passage of the 1977 Act and the promulgation of the Labor Department’s regulations. The Conference Report provides guidance regarding the criteria to be applied to Part C claims filed before the Labor Department’s permanent regulations were issued.
The Conference Report states:
The conferees intend that the Secretary of Labor shall promulgate regulations for the determination of total disability or death due to pneumoconiosis. With respect to a claim filed or pending prior to the promulgation of such regulations, such regulations shall not provide more restrictive criteria than those applicable to a claim filed on June 30, 1973 [Part B claims], except that in determining claims under such criteria all relevant medical evidence shall be considered in accordance with standards prescribed by the Secretary of Labor and published in the Federal Register.
Id. (emphasis supplied). The language of the Conference Report indicates that the conferees intended to establish a medical test for rebuttal by showing that the claim[490]*490ant “is able to do his usual coal mine work.”
It is clear to us that it was the intent of Congress, in legislating in 1977 with respect to Part C claims, that the Secretary’s regulations would allow the rebuttal of the disability presumption by medical evidence that the claimant it not totally disabled for coal mine work due to black lung disease. This is precisely what the Secretary did in promulgating 20 C.F.R. § 727.203(b)(2). It is true that, in the enactment of 30 U.S. C.A. § 902(f)(2) (West Supp.1972-1983) as part of the 1977 Act, it is provided that the Secretary’s “criteria” shall not be “more restrictive” than the criteria applicable to Part B claims. We do not believe, however, that this provision was intended to require continuance of the evidentiary rules applicable to Part B cases with the result that the presumption of physical disability created by 20 C.F.R. § 727.203(a) could not be rebutted solely by proof that the claimant is not physically disabled for his usual coal mine work. This is the view expressed in the Taft and Beatrice cases, infra, with which we agree.
Ramey maintains that this court’s decision in Haywood v. Secretary of Health and Human Services, 699 F.2d 277 (6th Cir.1983) is controlling in the instant case. The Haywood decision involved a black lung claim brought under Part B of the Act which is administered by the Social Security Administration. The Haywood court held that in a Part B black lung case, once the presumption of disability arises under 20 C.F.R. § 410.490, the presumption can be rebutted only if the employer demonstrates that the claimant is capable of performing mine work or comparable work and that such work is available. Id. at 285. The court stated, “[t]he Secretary cannot rebut the presumption unless he demonstrates that the claimant is not vocationally disabled in the immediate area around his home.” Id.
In the instant case, the claimant’s action arises under Part C of the Act which is administered by the Department of Labor. The Eleventh Circuit found that Haywood was inapposite to Part C cases. Taft v. Alabama By-Products Corp., 733 F.2d 1518, 1522 (11th Cir.1984). Like the Taft court, we find that our Haywood decision is not applicable to Ramey’s Part C claim for reasons heretofore indicated.
Our review of the Act, its legislative history, applicable regulations and relevant precedent convinces us that vocational proof is not required under Part C to rebut the presumption where it is shown that the claimant is “able to do his usual coal mine work.”
The Board’s decision in Petitioner Ra-mey’s case is Affirmed.
II. Lewis
A. Vocational Evidence
Like Petitioner Ramey, Petitioner Lewis contends that the AU improperly found that the presumption was rebutted under 20 C.F.R. § 727.203(b)(2) because the AU failed to consider vocational evidence. For the reasons discussed above, we find that, even if (b)(2) were a relevant provision in this context, the test of total disability is solely a medical test and that Lewis’ contention is without merit.7
B. Evidence of Cardiovascular Disease
The AU also found that the employer had rebutted the presumption under 20 C. F.R. § 727.203(b)(3) because Lewis’ disability was attributable entirely to his cardiovascular disease and that the disease did not stem, in whole or in part, from his coal mining work.
Lewis’ last day of work was September 24, 1976. On October 5, 1976, Lewis entered St. Joseph’s Hospital in Lexington, Kentucky where he underwent cardiac catheterization. Dr. Donald Wakefield, Lewis’ treating physician, diagnosed pri[491]*491mary myocardial disease of undetermined etiology and ventricular arrhythmia.
On October 25, 1976, Dr. Lowell Martin, a general practitioner, found that Lewis’ x-ray revealed stage 2/2 “q” pneumoconio-sis category A. However, Dr. E.N. Sar-geant, a Board certified radiologist and a “B” reader, re-read the x-ray taken by Dr. Martin as negative for pneumoconiosis. Dr. Martin also noted pleural thickening and left ventricular prominence. He opined that Lewis should not return to underground coal mining because of his silicosis.
Dr. James D. Adams, a general practitioner, examined Lewis on November 2, 1976, and noted fibronodular densities and linear fibrosis consistent with a diagnosis of coal worker’s pneumoconiosis. In Adams’ opinion, Lewis was suffering from coal worker’s pneumoconiosis and organic heart disease. He recommended that pulmonary function studies should be performed to determine the degree of Lewis’ pulmonary impairment and recommended that Lewis avoid further dust exposure. However, the x-ray taken by Dr. Adams was re-read by Dr. E.N. Sargeant, a Board certified radiologist and “B” reader, as negative for pneumoconiosis.
On December 9, 1976, Dr. Richard P. O’Neill, a pulmonary specialist, examined Lewis and diagnosed chronic bronchitis, simple stage 1/1 (“p” and “q”) pneumoconi-osis and myocarditis of undetermined etiology. Dr. O’Neill noted that Lewis declined to do a spirometry because of his heart problem. Lewis’ blood gas studies were normal. Dr. O’Neill stated that if Lewis did not suffer from a heart condition, Lewis could perform light physical labor, providing he was not exposed to dust.
Dr. Ballard Wright examined Lewis on February 23, 1977. He diagnosed arterio-sclerotic heart disease with old inferior wall infarction by history and a history of angina. Dr. Ballard Wright found no evidence of pneumoconiosis. Dr. Wright noted that Lewis did not undergo spirometry tests and that Lewis’ blood gas results were consistent with heart disease. He stated that Lewis’ x-ray revealed “no active disease within the chest.”
A February 28, 1977, examination of Lewis conducted by Dr. Harvey A. Page revealed that Lewis had a history of arteri-osclerotic heart disease. Dr. Page remarked that Lewis’ personal physician had advised Lewis not to undergo spirometric testing because of his heart condition.
Dr. Frank T. Varney, a general practitioner, examined Lewis on May 5,1977, and found that Lewis’ x-ray revealed pneumo-coniosis class 1/2 “q” Dr. Varney noted that pulmonary function studies were not performed because of Lewis’ cardiovascular disease.
On December 14, 1978, Dr. William H. Anderson, a pulmonary specialist, examined Lewis and diagnosed category II pneu-moconiosis, cardiovascular disease and osteoarthritis of the spine. An electrocardiogram performed by Dr. Anderson revealed an interventricular conduction defect with frequent premature ventricular contractions. Dr. Anderson noted that pulmonary function studies were not done because Lewis stated to Dr. Anderson that he had too much heart disease to undergo pulmonary function testing. In his deposition testimony, Dr. Anderson indicated that Lewis’ heart disease did not stem from Lewis’ exposure to coal dust. Dr. Anderson stated that Lewis would be functionally able to perform hard manual labor but for his heart disease.
Dr. Allen Cornish, a Board certified radiologist and “B” reader, examined x-rays taken on December 30, 1976, and on February 28, 1977, and found “no evidence of pneumoconiosis.” Dr. Cornish also examined Lewis on February 28, 1980, and diagnosed only heart disease and obesity. In his deposition testimony, Cornish indicated that Lewis’ chest report was negative and that he saw “no deterrent to Lewis’ returning to work in the mines.”
The AU evaluated all the medical evidence and concluded that Lewis had a totally disabling heart disease unrelated to his coal mine employment, but that he did not [492]*492have a totally disabling pulmonary impairment. He held that the employer rebutted the presumption under 20 C.F.R. § 727.-203(b)(3).
This court recently discussed rebuttal under 20 C.F.R. § 727.203(b)(3) in Gibas v. Saginaw Mining Co., 748 F.2d 1112 (6th Cir.1984). In Gibas, a black lung claimant, as here, suffered from cardiovascular disease and pneumoconiosis. The AU determined that the presumption of total disability due to black lung disease had been established pursuant to 20 C.F.R. § 727.-203(a) and that the presumption had not been rebutted under 20 C.F.R. § 727.-203(b)(3) because it had not been shown that the disability was not in part caused by the black lung disease. It was argued that the AUs decision resulted in the allowance of benefits where the claimant was not totally disabled due to black lung disease as is required by the Act. The Gibas court, after pointing out that the presumption of total disability due to black lung disease had been established, then said:
Thus, section 727.203(b)(3) does not permit the award of benefits for partial disability; it merely grants an employer the chance to prove that a miner’s disability did not arise, in whole or in part, from his coal mine employment. If an employer is able to prove that pneumoconiosis played no part in causing a miner’s disability, then the employer has satisfied the requirements of section 727.203(b)(3). Where, however, pneumoconiosis is a contributing cause to a miner’s total disability, he is conclusively entitled to benefits.
748 F.2d at 1120. We make this particular reference to Gibas to demonstrate that the holding there is not inconsistent with the holding here. In this case, the AU found that Lewis’ cardiac condition was the sole cause of his total disability, and this decision is supported by substantial evidence, while the Gibas court found that Gibas’ pneumoconiosis was a contributing cause to the miner’s total disability.
The Board’s decision in the Lewis case is therefore Affirmed.