Table 2.

Particle size measurements on workers in Western Australian mineral treatment plants and surface mining operations.^a

Mineral sector	Work Activity	Test year	No. tests	MMADb (AMAD), µm	GSDc
Mineral sandsd	Dry plant operators	1993	49	(15.7)	2.9
Mineral sandse	Dry plant operators	1995	25	18.0	2.1
Mineral sandsf	Monazite plant operators	1995	5	(14.0)	3.0
Mineral sandsg	Dry plant operators	1997	3	17.7	2.3
Nickelg	Surface mine workers	1997	8	18.6	2.2
Industrial mineralsg	Dry plant operators	1997	12	21.3	2.0
Bauxite/ aluminag	Refinery operators	1997	8	22.5	1.6
Iron oreg	Surface mine workers	1997	27	16.3	2.3

^aMarple 298 personal cascade impactor was used to determine median particle size in all tests listed.

^bMMAD—Mass median aerodynamic diameter. AMAD = activity median aerodynamic diameter. AMADs determined via alpha particle counting of impactor plates.

^cGSD—Geometric standard deviation.

^dData from Koperski (1993); reported as AMAD.

^eThe raw data from 25 tests were directly provided to one of the authors by the company.

^fData from measurements on five consecutive days; reported as AMAD (Terry et al. 1995).

^gData extracted from a mining industry research study (Terry et al. 1998).