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The Green Tree facility provides and stores, digitally and in microfilm (aperture cards), [4] over 182,000 maps of abandoned mines. This repository contains maps of mine workings from the 1790s to the present day. [5] It serves as a point of reference for mine maps and other information for both surface and underground mines throughout the ...
The CONSOL Energy Mine Map Preservation Project is a project to preserve and digitize maps of underground coal mines in Southwestern Pennsylvania.. The project is a joint venture between the Pennsylvania Department of Environmental Protection, the United States Department of the Interior Office of Surface Mining, the University of Pittsburgh University Library System, and CONSOL Energy.
Green Tree is a borough in Allegheny County, Pennsylvania, United States. The population was 4,941 at the 2020 census . [ 3 ] It is a suburb of the Pittsburgh metropolitan area .
The Pittsburgh Coalfield (Pittsburgh Coal Region) is the largest of the Western Pennsylvania coalfields.It includes all or part of Allegheny, Fayette, Greene, Washington, and Westmoreland Counties in Pennsylvania.
In 1760, Captain Thomas Hutchins visited Fort Pitt and reported that there was a mine on Coal Hill, the original name given to Mount Washington across the Monongahela River from the fort. The coal was extracted from drift mine entries into the Pittsburgh coal seam at outcrop along the hillside about 200 feet above the river.
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A small part of the Centralia mine fire after being exposed during excavation in 1969 Steam rising through a fissure in the ground in the closed-off area of former Pennsylvania Route 61 in 2010.
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