Table 2.

National estimates for number of metal and nonmetal miners by primary work location, National Survey of the Mining Population, employees, 2008.³

	Metal				Nonmetal
Work location	Nationalestimate	95% CI	Nationalpercent	National percent 95% CI	Nationalestimate	95% CI	Nationalpercent	National percent 95% CI
Underground mine: underground	6,152	876–11,428	15.8	2.0–29.5	1,971	1,050–2,892	10.3	5.5–15.0
Underground mine: surface shops or yards	1,252	327–2,177	3.2	0.6–5.8	422	94–751	2.2	0.5–3.9
Surface mine: strip, open pit, or quarry	16,624	0–34,516	42.7	20.9–64.4	2,483	1,515–3,450	13.0	6.9–19.0
Surface mine: dredge					49	0–130	0.3	0.0–0.7
Surface mine: other	1,876	405–3,348	4.8	0.5–9.1	4,673	0–9,870	24.4	5.2–43.6
Independent shops or yards					159	5–313	0.8	0.0–1.7
Mill operations, preparation plants, or breakers	9,307	4,644–13,970	23.9	9.1–38.7	7,088	4,880–9,296	37.0	24.0–50.0
Office	3,751	782–6,720	9.6	6.9–12.4	2,324	1,502–3,146	12.1	7.2–17.0

^† Data suppressed because of insufficient numbers within sampled population.

^* Not applicable to metal mines.