Maitland samples

Black Beauty and Maitland Samples. Approximately three miles northwest of Walsenburg, Colo., coal beds of the Vermejo formation are cut by a northeast-trending. nearly vertical dike which is approximately 25 feet thick. Fortunately, at this locality two coal mines have operated—one on either side of the dike. Both mines have been developed by drifting in from the outcrop of the seam. The Black Beauty mine on the south side of the dike has developed down dip more or less parallel to the strike of the dike. The main slope of the Maitland No. 2 mine on the north side has developed down dip and... 

Representative samples taken from the face of the main slope (approximately 900 feet from the dike) of the Maitland No. 2 mine (samples M-l and M-3) and a third sample back approximately 100 feet (M-2) show reflectance values of 0.65%, 0.61%, and 0.65%, respectively. Two additional samples taken approximately 1600 feet from the dike (M-4 and M-6) have reflectance values of 0.48% and 0.47%, respectively. None of the coal material exposed at any place in the mine is visibly altered by the intrusion. However, the reflectance values are quite sensitive and have recorded some effect from the heat of the dike rock. 

Figure 6. Generalized schematic to show relationships of sample areas in the Black Beauty and Maitland No. 2 mines to the dike (hand with checks)...

The authors wish to acknowledge the support of the National Science Foundation (Grant No. NSF GP-137). Ross Johnson of the U.S. Geological Survey has been of great assistance in all phases of the work. His help is gratefully acknowledged. We also wish to thank the owners of the Red Ash Coal Co. who helped in collecting samples from the Maitland No. 2 mine. 

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