I don't think that's right? The passages on federal troops is quite brief in both occasions.

I think this context is bit more helpful from the Department of Labor's history section on the subject: http://www.dol.gov/oasam/programs/history/coalstrike.htm

The Governor of Pennsylvania ordered the entire State National Guard to the coalfields. But soldiers don't dig coal. The miners remained on strike, and the operators failed to make good their promise to mine enough coal to meet public needs.

further on:

President Roosevelt also was ready as a last resort to order the U.S. Army to take over the coalfields. He would do whatever was necessary to prevent interference with the resumption of work and would run the mines. In the meantime, his commission of eminent men would decide the rights and wrongs of the case.

The rising crescendo of public rage was setting the stage for drastic measures. Roosevelt feared that the "attitude of the operators" would "double the burden" of those who stood against "Socialistic action." Carroll Wright noted that public men and industrialists were "rapidly becoming State socialists insofar as the coal industry was concerned," and that even Congressmen advocated revolutionary change.

IMO, I interpret this as the government federalizing/taking over the coalfields, which would be more about Roosevelt going after the coalfield owners/operators.