Acid Mine Drainage

Acid mine drainage is just one of the many problems of AML. Mines fill up with water and spill over into local watersheds, or water seeps through former mining sites contaminating the water. 

 

The EPA classifies AMD as being characterized by one or more of the following:

• Low pH ( high acidity)
  
• High metal concentration (usually iron, aluminum and manganese)
  
• Elevated sulfate levels 
  
• Excessive suspended solids 

Acid mine drainage can cause streams to die with no active fish, or insect life, and stunted plant growth. AMD can also lead to orangish colored water (with the iron), and sometimes even metallic (with the aluminum). 

Measures are being taken by local groups in conjunction with the EPA to clean up local watersheds. These projects are know as Abandoned Mine Drainage Abatement and Treatment plans (AMDAT). 

Raccoon Creek Watershed

"The Raccoon Creek Watershed Partnership is neat. It's a non-profit and agency partnership, but it's not an adversarial relationship it is a collaboration to improve the watershed's quality."- Ben McCament, Raccoon Watershed Coordinator. 

Raccoon Creek Watershed Partnership originally began in the 1980s with concerned citizens. In the early 90s the citizen group paired up with state agencies to take action. Since the partnership formed they have completed 10 projects from $7 million in grant funding.

The partnerships main focus is to restore the main stem of Raccoon Creek, as well as the main stem of Little Raccoon Creek. In hopes of restoring the creek the partnership divided the area into three sections, the headwaters, middle basin, and Little Raccoon Creek. Each section has multiple projects to restore the water as it enters the main stem.

Whenever beginning a new project lots of monitoring and studying takes place, and all treatment options are considered. They average 350 water samplings a year, as well as  fish monitoring and habitat monitoring, totally about  2-3 months of observation.

"We have limited resources so we want to make the best choice, which will help the stream with the most recovery," said McCament. 

The idea way to combat AMD is to fill in underground mines so water can no longer seep through them. When that isn't an option due to money and resources, there are a variety of treatments the Raccoon Creek Partnership uses. 

One the partnership treat AMD is by building steel slags. A pond will is built containing steel slag ( a byproduct of mating steel) above the source of acid mine drainage. This decreases the waters acidity before the AMD point. This will neutralize the water once the two combine before the stream runs into the creek. 

Another similar treatment is limestone ponds. The pond filled with limestone will be placed below a contaminated area and the water will flow it decreasing in acidity. The water will then flow through a second pond where clumped metals will be deposited before the stream flows again towards the main stem. 

Other treatment methods the partnership employs are wetlands- the biological activity with in then decreases the water acidity. The final treatment employed by Raccoon Creek is a doser. The doser is the only active treatment in Ohio and it involves directly adding chemicals to the water to neutralize it. 

"All streams are worth restoring and protecting. Raccoon Creek is one of the largest creeks (actually a river) with lots of resources and public land. It has a large potential for recover. The creek hasn't been completely destroyed," said McCament. 

A stream is considered restored when it meets the EPA bio criteria for water.
McCament estimates that the partnership has about a dozen more priority projects, totally at least another 20 years of work and $10 million. 

*Raccoon Creek only deals with abandoned mines, mines before 1977, mines since then have had to take care of cleaning up after themselves. 

Other Local AMDAT Projects

Federal Valley Watershed Group 
Monday Creek Restoration Project 
Sunday Creek Watershed

This is a picture of  the Cardondale Doser the only active treatment used in the state of Ohio. It's located in the headwaters of the creek. Each day it dispenses 1/2 ton of chemicals. It holds a total of about 7 tons.
Dissolved aluminum in the acidic water precipitates as a solid flocculent when the water from the mine is exposed to oxygen. This chemical reaction typically occurs when the pH is above 4.5 (Raccoon Creek Partnership description.)

The upper Oreton Valley is blocked by abandoned surface mile spoil. The AMD water then flows down into the lower wetland before entering Pierce Run. Some of the Iron is store in this wetland but the majority is flushed into Pierce Run. ( Raccoon Creek Partnership description.)

(Information from Ben McCament Raccoon Watershed Coordinator, and from the EPA site. Pictures courtesy of the Raccoon Creek Partnership.) 

Abandon Mine Land

Abandon Mine Land (AML) is a serious issue in Southeast Ohio.  Prior to coal regulations, mines were not properly mapped, maintained, or reclaimed (cleaned up after). This has lead to large numbers of abandon mines, covering acres above and below ground. 

Problems with Abandon Mine Land

1. Mine Openings

Older mine openings may have not been adequately sealed, or sealed at all. These opening can be hazardous. Not only falling into a mine is dangerous, but exploring one can be as well. Mines can have poisonous gases, unstable roofs, flooded sections, and are pitch black.

2.Land slides

Gob piles, spoil banks, and mine slopes can often become unstable. These areas then have the potential to become a land slide due to steep hills, or water saturation. The slides can cover roads and block streams causing flooding. 

3.Highwalls
Highwalls occur during surface mining when the coal seam is exposed. The highwall can resemble a cliff and can be extremely dangerous if it isn't covered over to remove the free fall.

4.Acid Mine Drainage

(more in a later post)

5.Subsidence 

Subsidence is when houses, and other dwellings undergo damage due to an underground mine collapse. 

In Athens County it is mandatory to have subsidence insurance coverage. This coverage can be obtained through a homeowners insurance company and is a $1 annual premium for  the residence. 

Its important for residents to know about AML before building a house in the area. The DNR has composed a guide of things to learn before building. 

The Department of Natural Resources in Ohio has devised an interactive map (may have to disable pop-up blocker, and agree to terms of use) to see where underground mines are. 

(information from the Ohio DNR)