Mining and the Environmental Impacts Mining Methods Surface

Mining and the Environmental Impacts

Mining Methods

Surface Mining

Shallow deposits = Surface mining – vegetation, soil, and rock (Overburden) are removed and set aside as spoils �Sometimes referred to as MOUNTAINTOP REMOVAL �Need to restore the land after mining is done � Mountaintopremoval SURFACE MINING

�Scarring and disruption of the land surface �Acid Mine Drainage – rainwater seeping through waste pile or mine carries sulfuric acid produced by bacteria in spoils and contaminates nearby groundwater �Filling in of valleys and streams �Major air and water pollution �Noise, ugliness, heat, land accidents, etc. Environmental efffects

�Deep deposits = Subsurface Mining �Less land disturbance than surface mining �Less waste material �More dangerous & expensive (black lung) �Subsidence – collapse of land �Breaching underground water – aquifer Subsurface Mining

� Surface Mining Control and Reclamation Act of 1977 (SMCRA) = the primary federal law that regulates the environmental effects of coal mining in the United States. � Mine operators are required to minimize disturbances and adverse impact on fish, wildlife and related environmental values and achieve enhancement of such resources where practicable. Restoration of land water resources is ranked as a priority in reclamation planning. � Sounds good? Difficult in arid regions (little precip, low soil fertility, soil doesn’t hold water, etc) Reclamation

�Recontour/regrade land to original condition �Replace topsoil �Replant with native vegetation �Monitor for 5 -10 years, depending on location Steps to Reclaim Land