Abstract :
THE TRENDS and amount of elecric power use and cost at bituminous coal mines are of interest to the executive, the operating man, and the engineer alike. A study of the data based on a single year, or even a few years, could result in misleading conclusions; but the data from over 400 representative mines for the past 26 years make it possible to determine the trends quite accurately. These trends, illustrated by graphs and tables, are discussed in this article.
