Total disability
(29) Total disability and partial disability, for purposes of this part, have the meaning given them as provided in part 718 of this subchapter. (30) Underground coal mine means a coal mine in which the earth and other materials which lie above and around the natural deposit of coal (i.e., overburden) are not removed in mining; including all land, structures, facilities, machinery, tools, equipment, shafts, slopes, tunnels, excavations and other property, real or personal, appurtenant thereto. (31) A workers' compensation law means a law providing for payment of benefits to employees, and their dependents and survivors, for disability on account of injury, including occupational disease, or death, suffered in connection with their employment. A payment funded wholly out of general revenues shall not be considered a payment under a workers' compensation law. (32) Year means a period of one calendar year (365 days, or 366 days if one of the days is February 29), or partial periods totaling one year, during which the miner worked in or around a coal mine or mines for at least 125 working days. A working day means any day or part of a day for which a miner received pay for work as a miner, but shall not include any day for which the miner received pay while on an approved absence, such as vacation or sick leave. In determining whether a miner worked for one year, any day for which the miner received pay while on an approved absence, such as vacation or sick leave, may be counted as part of the calendar year and as partial periods totaling one year. (i) If the evidence establishes that the miner worked in or around coal mines at least 125 working days during a calendar year or partial periods totaling one year, then the miner has worked one year in coal mine employment for all purposes under the Act. If a miner worked fewer than 125 working days in a year, he or she has worked a fractional year based on the ratio of the actual number of days worked to 125. Proof that the miner worked more than 125 working days in a calendar year or partial periods totaling a year, does not establish more than one year. (ii) To the extent the evidence permits, the beginning and ending dates of all periods of coal mine employment must be ascertained. The dates and length of employment may be established by any credible evidence including (but not limited to) company records, pension records, earnings statements, coworker affidavits, and sworn testimony. If the evidence establishes that the miner's employment lasted for a calendar year or partial periods totaling a 365-day period amounting to one year, it must be presumed, in the absence of evidence to the contrary, that the miner spent at least 125 working days in such employment. (iii) If the evidence is insufficient to establish the beginning and ending dates of the miner's coal mine employment, or the miner's employment lasted less than a calendar year, then the adjudication officer may use the following formula: divide the miner's yearly income from work as a miner by the coal mine industry's average daily earnings for that year, as reported by the Bureau of Labor Statistics (BLS). A copy of the BLS table must be made a part of the record if the adjudication officer uses this method to establish the length of the miner's work history. (iv) Periods of coal mine employment occurring outside the United States must not be considered in computing the miner's work history.