During 1979 about 26 million tons of coal was produced in Indiana, 97 percent of which was derived from surface operations. Surface mining has not always played this preeminent role; underground mining was once the major method of coal extraction in the state. Since 40 percent of strippable reserves has already been exploited, surface mining in Indiana is almost certain to decline within a few decades. Through the years, it has been predicted that this inevitable decline in surface production will be accompanied by a resurgence of underground mining in areas of deeper coals. This plausible prediction is a corollary of the often-repeated assertion that the decline of underground mining in Indiana was related almost solely to the development of surface mining. However, other factors also worked to the disadvantage of producers of coal by underground methods, and some of these other factors will be briefly reviewed in this report.
Harper, D., 1981, Trends in underground coal mining in Indiana: Indiana Geological Survey Occasional Paper 33, 13 p., 15 figs.
You may also like:
Can't find what you're looking for? Feel free to contact us directly:
Publication Sales Office
Indiana Geological and Water Survey
420 N. Walnut St.
Bloomington, IN 47404
IGS Return Policy
All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.
The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.