How much money did coal mines make in the 1800s?

In the 1800s, coal mines in the United States and Europe generated significant profits, driven by the Industrial Revolution's demand for coal as a primary energy source. While exact figures vary, large mines could earn thousands of dollars per year, with profits increasing as railroads expanded and coal became essential for steam engines, heating, and manufacturing. The industry's profitability also led to significant investments and the expansion of mining operations throughout the century.