GLENROCK PUBLIC MEETING for ABANDONED MINE LANDS 2020 CONSTRUCTION AND MINE MITIGATION PROJECT

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

GLENROCK PUBLIC MEETING for ABANDONED MINE LANDS 2020 CONSTRUCTION AND MINE MITIGATION PROJECT

AML Presentation and Townhall Meeting:
When: March 9, 2020 @ 7pm
Where: Glenrock City Hall

Glenrock has had a long history of room and pillar coal mining within three high producing mines at the turn of the 19th Century; these include the McDonald Mine and Glenrock Mines No. 1 and No. 2.

After mining, open rooms and voids, created from coal extraction underground, have been mostly left in place and/or abandoned leaving them susceptible to eventual collapse. Overtime, this collapse will eventually propagate upwards through the overburden rock material causing subsidence and sinkholes at the ground surface. These sinkhole events could have substantial negative effects to the structural integrity of buildings and roadways. By filling these mines with grout, you significantly reduce the probability for mine related subsidence by eliminating the potential for additional ground settlement and mine collapse.


How is mine related subsidence mitigation and investigation preformed?

Mine subsidence mitigation consists of drilling holes for the injection of grout within the mined interval and/or mined room. Grout is transported by means of a concrete truck and injected immediately underground. This process is repeated for each drilled hole encountering mine workings.


What to expect…

During construction/investigation, there is a potential for noise, dust, and construction traffic. Parking could be temporarily blocked during subsidence mitigation and investigation. A Brierley representative might request you to temporarily relocate your vehicle during construction. Passing traffic may also be blocked temporarily and/or redirected. Working hours are established to minimize noise and disturbance and will be respected as best as possible.