Trace Elements in West Virginia Coals

Gallium (Ga) Summary Statistics

The histogram of gallium in all West Virginia coal beds shows an asymmetrical, slightly skewed distribution with a mean of 6.45 ppm (± 5.26 ppm) on a whole coal basis. The maximum Ga content was 90.42 ppm in the Brush Creek coal. Gallium correlated moderately with ash yield, indicating an slight association with mineral matter in West Virginia coals. Gallium also correlated with the ash associated elements such as vanadium (V), scandium (Sc), chromium (Cr), lead (Pb), lithium (Li), yttrium (Y), thorium (Th), cesium (Cs), nickel (Ni) and zirconium (Zr) and rare earth elements erbium (Er), lutetium (Lu), ytterbium (Yb), neodymium (Nd), dysprosium (Dy), europium (Eu) and gadolinium (Gd).

**Spearman Correlation Coefficients (r) with Gallium**
Ash Yield	V	Sc	Cr	Pb	Li	Y	Er	Lu	Th
+0.6159	+0.8335	+0.7509	+0.7460	+0.7324	+0.6882	+0.6853	+0.6823	+0.6757	+0.6619
n = 844	n = 843	n = 844	n = 843	n = 841	n = 844	n = 844	n = 208	n = 502	n = 821
Yb	Cs	Ni	Nd	Dy	Rb	Zr	Eu	Te	Gd
+0.6543	+0.6425	+0.6398	+0.6366	+0.6328	+0.6265	+0.6132	+0.6073	+0.6046	+0.6041
n = 546	n = 780	n = 844	n = 418	n = 78	n = 403	n = 746	n = 539	n = 113	n = 334

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Page last revised: March 2, 2002

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