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The map summarizes surface features resulting from coal mining. The distribution of surface features is largely from 1973, 1:12,000 scale aerial photographs verified by field reconnaissance in 1973 and 1974.
View and download underground coal mine maps at specific site locations. Individual maps are linked to their PHUMMIS database record for information on each map. By clicking on "Map Details" on the map list record, the PHUMMIS database will launch and open to the map sheets information.
This enormous resource contains thousands of detailed coal mine maps that can be overlaid on a variety of base maps for the entire state, including terrain, topographic and road maps, and aerial photographs.
Workers transcribed information about the extent of underground bituminous coal mines on to these maps, as well as locations of oil and gas wells. These maps are based on 15-minute topographic quadrangles, divided into nine sections.
Some maps, including some base maps, show oil and gas wells and whether they are active or abandoned, in addition to coal seams. Some coal seams are mis-identified, some mines are omitted, and some mine locations are mis-mapped.
23 mar 2017 · The DEP estimates 230,000 homes in Allegheny County -- roughly 42,000 in Pittsburgh alone -- are at risk of sinking into the ground from subsidence, the term for a shift in the ground when a...
This report consists of coal data for Allegheny County compiled on 7.5-minute topographic quadrangle maps. The maps were drawn at 1:24,000 scale and published at 1:62,500 scale (page size). There are two types of maps in the report.
