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From:
Published online 2010 September 27. doi: 10.1093/annhyg/meq022

Table 3.

Characteristics of the mining facilities

Mining facility—ore type (year of first diesel use)Workersa (n)DecadeMining methodDecade mean of ADJ HP underground (min and max)Decade mean of total exhaust airflow rate undergroundb (kcfm) (min–max)
A—limestone (1947)16841940sCv/H647 (644–649)NA
1950sCv/H1158 (649–1615)NA
1960sCv/H2119 (1273–4829)NA
1970sCv/H5738 (5016–6096)NA
1980sCv/H7082 (6471–7789)NA
1990sCv/H8559 (7995–9105)NA
B—potash (1964)8991960sCv/Con202 (75–268)229 (125–250)
1970sCv/Con, Ct425 (263–761)250 (250–250)
1980sCt795 (433–907)250 (250–250)
1990sCt488 (461–527)250 (250–250)
D—potash (1950)21051950sCv/H76 (26–191)310 (310–310)
1960sCv/Con462 (246–598)310 (310–310)
1970sCv/Con1598 (557–2313)310 (310–310)
1980sCv/Con2549 (2360–2741)490 (310–620)
1990sCv/Con, Ct2865 (2754–3402)664 (600–700)
E—salt (1959)5481959Cv/H125160
1960sCv/H1503 (227–2296)160 (160–160)
1970sCv/H2509 (2370–2705)172 (160–200)
1980sCv/H2527 (1928–2846)228 (208–247)
1990sCv/H1936 (1752–2058)266 (236–286)
G—trona (1962)11671960sCv/Con350 (39–64)212 (200–235)
1970sCv/Con813 (694–871)293 (212–350)
1980sCv/Con, Ct674 (646–727)481 (314–570)
1990sCv/Con, Ct681 (632–734)544 (530–552)
H—trona (1967)19371960sCv/Con423 (385–499)300 (300–300)
1970sCv/Con, Ct, LW1021 (509–1329450 (300–600)
1980sCv/Con, Ct, LW1103 (1034–1173)915 (600–950)
1990sCt1303 (1174–1384)1309 (950–1429)
I—trona (1956)24531950sCv/H, Con, Ct24 (9–35)440 (350–530)
1960sCv/Con, Ct81 (42–104)547 (530–700)
1970sCv/Con, Ct940 (210–1270)1079 (700–1450)
1980sCv/Con, Ct, LW1454 (1398–15051482 (1450–1630)
1990sCt, LW1465 (1383–1514)1519 (1500–1670)
J—potash (1952)15891950sCv/H84 (0–155)132 (60–143)
1960sCv/H & Con, Ct289 (160–501)187 (176–230)
1970sCv/Con, Ct834 (520–1085)238 (228–240)
1980sCv/Con, Ct1317 (1139–1421)239 (228–240)
1990sCt983 (950–1035)240 (240–240)

Mining method: Cv/Con, conventional with conveyor belts; Cv/H, conventional with truck haulage; Ct, continuous (with conveyor belts); LW, longwall (with conveyor belts); min, minimum; max, maximum; NA, not applicable (see Table footnoteb).

an, Number of workers from year of dieselization (1947–1967, depending on the facility) to 31 December 1997. Subjects are only counted once based on the mining facility in which they worked the longest. A total of 1007 subjects worked in more than one facility. The numbers reflect the cohort before exclusions due to invalid birth dates and other criteria. See Results.
bExhaust ventilation for the underground operations in Facility A consisted of holes drilled from the surface; some holes provided natural ventilation, while others had fans. Facilities B, D, E, and J had serial ventilation. Facilities G, H, and I had parallel ventilation.