GIS Data Catalog

Coal Mine Hazards

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Summary

Abandoned subsurface mine workings leave large underground voids which are hazardous in several ways.

Gradual failure of the roof and sides of these voids may result in subsidence of the ground surface over a large area overlying the mines.

Catastrophic failure of the roof can produce sudden and unexpected cave-ins.

Noxious gases and 'dead air' (lacing oxygen) may also collect in these voids.

In addition, animals or people may fall into surface openings; shafts, or tunnels.

Unstable mine spoil piles, frequently covered with vegetation and resembling natural hills, pose hazards as well.

Description

The King County Sensitive Areas Ordinance (SAO) defines coal mine hazard areas as those areas directly underlain by or adjacent to or affected by abandoned coal mine workings such as adits ( a nearly horizontal entrance to a mine), drifts (a secondary passageway between two main shafts) tunnels, or air shafts.

Layer information

Layer Name	coalmine_area
Subject Category	Environment
Title	Coal Mine Hazards
Feature Count	67
Feature Type	Polygon
Next Update	None planned
Spatial reference	EPSG:2926
Control ID	292
Place Keywords	Washington State, King County, WA, Pacific NW
Theme Keywords	Natural Resoures, None, Environmental, Enviro, Environment
Supplemental Information	None

Table Preview

Attribute information

Shape From ESRI	Description Feature Geometry Domain Coordinates defining the features
HAZARD From DDES	Description Hazard type Domain COL - Coalmine
EDIT_DATE From DDES	Description Edit date Domain Not Found
OBJECTID From ESRI	Description Internal feature number. Domain Sequential unique whole numbers that are automatically generated.
Shape.STArea() From SQL Server	Description Returns the area of a geometry instance in square units, based on the spatial reference identifier (SRID) of the geometry. Domain Double
Shape.STLength() From SQL Server	Description Returns the total length of the elements in a geometry instance. Domain Double

Contact information

Maintained by	DLS - Permitting
Primary	Paul McCombs paul.mccombs@kingcounty.gov

Terms of Use

License	Terms of use and copyright