Table 4.

Elemental composition (in parts per million) of coal samples, stratified by fuel type and source (median values).

Major coal type	County	Coal sub- type	Coal mine	N	Si	Al	Ti	Fe	Mn	Ca	Mg	Na	K	P	Cr	Ni	Sr	Ba	Zr
Smoky		Coking coal		116	92,100	19,750 ^{^}	1400 ^{^}	18,400	200	8400	1700 ^{^}	200 ^{^}	700 ^{^}	100 ^{^}	20 ^{^}	29	53	37 ^{^}	66 ^{^}
	Xuanwei			65	102,100	16,600	1000	19,100	500	14,400	1800	200	500	100	15	29	45	28	45
				63	102,300^*	16,900	1000	19,100^*	400^*	13,000^*	1800^*	200^*	600	100	15^*	29^*	45^*	29	45
			Azhi	15	80,800	13,000	600	10,300	700	27,900	1500	200	400	100	8	22	83	25	32
			Baoshan	5	99,100	25,300	1100	14,000	400	12,800	1400	200	500	100	12	25	39	25	93
			Laibin	14	115,050	16,200	850	27,700	600	17,900	1850	200	400	100	14	33	42	28	41
			Tangtang	22	115,750	22,500	1750	27,800	200	3950	2050	250	1100	100	32	34	31	35	71
			Yangchang	7	72,800	13,200	1000	6400	200	7200	1000	200	400	100	11	18	80	38	37
	Fuyuan			51	85,100	30,400 ⁺	3800 ⁺	18,100 ⁺	200 ⁺	5500 ⁺	1400 ⁺	300 ⁺	1700 ⁺	300 ⁺	37 ⁺	29 ⁺	59 ⁺	95 ⁺	141 ⁺
		Coking coal		15	121,100	49,700	7400	30,200	300	8600	3200	1100*	3900	600	50	43	94	240	200
			Daping	4	112,100	54,050	7950	34,750	250	9550	2850	750	4900	850	64	39	95	215	218
			Enhong	4	97,650	41,650	6700	27,900	300	10,750	5150	850	2950	450	60	35	108	207	191
			Haidan	6	121,150	55,000	10,500	30,850	400	5100	3000	1350	5100	750	60	48	92	418	276
			Zude	1	57,100	40,500	5000	16,300	100	8600	2500	400	3600	300	41	30	97	88	152
		1/3 coking		8	79,750	41,550	5850	27,900^*	200	3650^*	800	300	1700	250	60^*	27	52^*	95	208
			Bagong	5	79,800	43,900	6500	36,100	200	1000	600	300	1700	300	63	26	36	95	238
			Dahe	3	79,700	22,000	1700	5900	200	8200	900	200	1200	200	14	28	83	95	73
		Gas Fat		23	77,100	14,900	900	12,500	0	2400^*	1000	200	200	100	13	22	16^*	29	46
			Housuo	20	79,000	13,600	950	12,200	0	2600	850	200	250	100	13	23	24	28	45
			Qingyun	3	54,200	18,100	900	19,600	0	400	1200	200	200	100	12	22	10	33	50
		Meagre lean	Gumu	1	87,400	51,000	5400	19,400	300	18,900	3900	500	4900	400	41	28	99	115	174
Smokeless				29	84,000	43,800 ^*	5100 ^*	22,100 ^*	200	7800	2000 ^*	600	4100 ^*	300	35 ^*	25 ^*	69	109 ^*	157 ^*
	Fuyuan		LaoChang	19	85,700	36,800	4700	17,700	200	7800	2500	700	4900	300	29	22	74	130	148
	Xuanwei		RSXZ	5	77,900	71,000	7500	47,500	200	6000	1400	300	2500	300	75	31	19	65	223

Italicized data indicate overall value for each county.

^{^}

Statistically significant variation between smoky & smokeless coal types.

⁺

Statistically significant variation within that smoky coal subtypes for that region.

Statistically significant variation between mines within that coal type in that region.