Yampa coal field land status and Federal mineral ownership (yamowng)

This is a shapefile and unioned polygon ownership coverage used to calculate coal resources of the A through D coal zones, Yampa coal field, northwestern Colorado. Polygons that have been combined include counties, 7.5' quadrangles, townships, surface and coal ownership. This ownership coverage was clipped by the largest resource boundary polygon--that of the A coal zone.本数据集为采用形状文件（shapefile）格式的联合多边形权属覆盖图层，用于计算科罗拉多州西北部扬帕煤田（Yampa coal field）内A至D煤组的煤炭资源量。已完成合并的多边形涵盖县级行政区、7.5分地形图幅（quadrangle）、地籍镇区、地表权属与煤炭权属。 该权属覆盖图层已通过最大的资源边界多边形——即A煤组的边界多边形——完成裁剪处理。