In the last decade, land development has encroached on the undermined area of the Boulder-Weld coalfield, and the importance of subsidence has been recognized. This study is directed primarily toward the problems of land-use in those undermined areas where subsidence has occurred in the past and may occur in the future.

Coal Mine Subsidence and Land Use in the Boulder-Weld Coalfield, Boulder and Weld Counties, Colorado. Colorado Geological Survey, Colorado Department of Natural Resources, 1975. NR7.11/9/INTERNET . Booklet (PDF) Plate 1: Extent of Mining Map (PDF) Plate 2: Depth of Cover Map (PDF) Plate 3: Mine Pillars Map (PDF)

"This research was funded in part by the United States Department of Interior, Bureau of Mines through grant no. G0244001, and in part by Weld County."

Potential subsidence hazards from underground mine working and shafts exist in many parts of Colorado. These include areas of past and present coal mining, “hard rock” mining areas, and undoubtedly others.

In the last decade, land development has encroached on the undermined area of the Boulder-Weld coalfield, and the importance of subsidence has been recognized. This study is directed primarily toward the problems of land-use in those undermined areas where subsidence has occurred in the past and may occur in the future.

Numerous subsidence events have been recorded by the Colorado Geological Survey (CGS) in Boulder and Weld Counties, Colorado. Suspected observed subsidence events in the region are shown in Figure 1.1. Utilities, roadways, and both commercial and residential structures have been damaged at considerable expense to landowners.

2020年1月29日 · Subsidence: Collapse of the ground surface over subsurface voids or settlement over native, low density soils. Subsidence can occur suddenly or slowly over a long period of time. Undermined Area: An area underlain by coal mine workings, with the potential for subsidence of the ground surface due to collapse of underground mine voids.

Coal development then progressed east to deeper mines with increasingly more sophisticated technology. In a report entitled “A Study of Falls of Roof and Coal in Northern Colorado” Tomlinson (1933) describes the mining method used in five of the largest operating mines in the Boulder/Weld coalfield as “Pairs of room entries are

2015年2月19日 · The Colorado Mine Subsidence Information Center is a repository for all known existing maps of inactive or abandoned coal mines in the state and can be reviewed by appointment with a Colorado Geological Survey staff geologist. For an appointment, call 303- …

Subsidence Evaluation Client: Private Developer Location: Boulder County, CO, United States. MES performed a subsidence hazard evaluation for new development in the Sunshine District.