high-volatile bituminous coal in the northern part of the region to lignite in Texas.

The Western Region of the United States has several coal basins that contain all ranks of coal. Over half of the coal produced in the United States comes from this region; four of the states listed in Table 2-3 (Wyoming, Montana, Colorado, and North Dakota) produce approximately 44% of the total coal. Of these, Wyoming is by far the largest coal mining state in the

United States, as it produces approximately 34% of the country's total coal. Lignite is mined in North Dakota and Montana, subbituminous coal is mined in southeastern Montana and northeastern Wyoming, and the principal bituminous coal mining production is in Utah, Colorado, and Arizona.

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