ST. LOUIS, Oct. 22, 2019 /PRNewswire/ -- Arch Coal, Inc. (NYSE: ARCH) today reported net income of $106.8 million, or $6.34 per diluted share, in the third quarter of 2019, compared with net income of $123.2 million, or $6.10 per diluted share, in the prior-year period. The company had...