Table 2. Proximate Analysis and Vitrinite Reflectance Results^a.

		proximate analysis
sample number	location	Mad (%)	Aad (%)	Vdaf (%)	Ro,max (%)	coal rank
CZ	Chengzhuang Mine, Shanxi Province	2.56	9.62	7.74	3.01	anthracite
WY	Wuyang Mine, Shanxi Province	1.00	8.83	13.20	2.06	bituminous coal
YJL	Yujialiang Mine, Shaanxi Province	6.17	3.54	29.51	0.65	bituminous coal

^aNote: M_ad, moisture content on an air-dry basis; A_ad, ash content on an air-dry basis; V_daf, volatile content on a dry, ash-free basis; R_o,max, maximum vitrinite reflectance under oil immersion.