King County GIS Center
King Street Center
201 S. Jackson St.
Suite 706
Seattle, WA 98104

+ 47.59909 N
- 122.33136 W

+ 47°  35' 56.72"
- 122° 19' 52.90"


Coal Mine Hazards

Description | Contacts | Attribute Information | Constraints

Data layer thumbnail image


Layer name: COALMINE
Subject category: enviro
Title: Coal Mine Hazards
Feature Count: 0
Feature Type: Polygon
Abstract: 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.
Purpose: 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. .
Status: Complete
Updated: None planned
Time period of content: (single date,as YYYYMMDD):: 19900101
Time period of content: (date range, as YYYYMMDD):: -
Spatial reference: WA State Plane North
FGDC Documentation: Classic or FAQ
Open Data Availability: Yes
Place Keywords: Washington state, King County, WA, Pacific NW,
Theme Keywords: natural resoures, none, environmental, enviro, environment,
Lineage: Available
Supplemental Information: None


Maintained by:
King County GIS Center
Primary: Paul McCombs, Permiting GIS Program Manager, 206-263-4867
(How to e-mail a County contact)
Secondary: KCGIS Center; This mailbox is monitored during business hours.

Attribute Information

_HAZARD_Hazard type
_EDIT_DATE_Edit date


Access: None

Use: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.