Mine reclamation is the process of restoring land that has been mined to a natural or economically usable state. Although the process of mine reclamation occurs once mining is completed, the planning of mine reclamation activities occurs prior to a mine being permitted or started. Mine reclamation creates useful landscapes that meet a variety of goals ranging from the restoration of productive ecosystems to the creation of industrial and municipal resources. In the United States, mine reclamation is a regular part of modern mining practices. Modern mine reclamation minimizes and mitigates the environmental effects of mining.
Video Mine reclamation
Reclamation processes
As part of the life cycle of a surface coal mine, completed mine areas must undergo rehabilitation. When mining ends, operators must restore the land to its approximate original contour (AOC) or leave the land graded and suitable for a "higher and better" post-mining land use (PMLU) that has been approved as part of the original mining permit application. Exceptions are provided when a community or surface owner is in need of flat or gently rolling terrain. Acceptable post-mining land uses include commercial, residential, recreational, agricultural or public facility improvements.
Forestry Reclamation Approach
Within the past decade, a new approach to reforestation --the Forestry Reclamation Approach, or FRA-- has been promoted by state mining agencies and the Office of Surface Mining (OSM) as an appropriate and desirable method for reclaiming coal-mined land to support forested land uses under SMCRA. This approach was developed through and is supported by research conducted through the Powell River Project, a cooperative research and education program focused on topics relevant to coal mining and reclamation in Appalachia.
The FRA establishes guidelines for achieving successful reforestation on mined lands, and can be summarized in the following five steps:
- Create a suitable rooting medium for good tree growth that is no less than four feet deep and made of topsoil, weathered sandstone, and/or the best available material.
- Loosely grade the topsoil or topsoil substitute established in step one to create a non-compacted growth medium.
- Use groundcovers that are compatible with growing trees.
- Plant two types (or more) of trees: early successional species for wildlife and soil stability, then commercially valuable crop trees.
- Use proper tree planting techniques.
Holistic approach
When the top successional species for the local environment is not forest due to local microclimate conditions, reclamation may be better accomplished by establishing rangeland instead. Holistic management has been championed by Dan Dagget and others for mine reclamation in these types of situations. When the best available material is not topsoil, topsoil can be made on site by using early successional species of native hardy perennial grasses and other plants, combined with livestock substituting for the species of wildlife needed to complete the biosystem.
- Grade the best available material to the required topography, establishing keylines.
- Sow the native species of early successional species of plants and grasses.
- Cover the area with a loose layer of hay mulch to provide the initial "jump start" of forage required for the livestock.
- Using keylines as a guide, establish paddocks and implement holistic planned grazing techniques to heal the land.
- If the goal is to establish a wildlife area or natural park, as the keystone species begin returning (a process called ecological succession) or are introduced in large enough numbers, livestock can be reduced or eliminated.
Alternatively, an integrated approach can be taken that uses the holistic approach to accomplish the first three steps of the forestry reclamation approach. Once those first three steps are accomplished and well-established, the livestock grazing can be reduced or eliminated to allow medium and higher successional species to take root and continue the forestry approach.
Maps Mine reclamation
United States
Prior to 1977, there were no federal laws regulating the surface mining aspect of the coal mining industry. Although many states with mining activity had passed laws to regulate operations, the laws varied from state to state and enforcement was inconsistent. Even as states began to enact more stringent regulatory legislation after World War II, they often lacked the funding to administer and enforce the legislation. Guidelines for post-mining reclamation were generally less stringent than they are today. For example, Colorado began a voluntary reclamation program in 1965, in which the mine operators were expected to act on their own to restore mined lands.
Under the Surface Mining Control and Reclamation Act of 1977
The Surface Mining Control and Reclamation Act of 1977 (SMCRA) is the primary federal law that regulates the environmental effects of coal mining in the United States. It established permitting guidelines for existing and future coal mines as well as a trust fund to finance the reclamation of abandoned mines. SMCRA balances the need to protect the environment from the effects of surface coal mining with the Nation's need for coal as an essential energy source. It ensures that coal mining operations are conducted in an environmentally responsible manner and that the land is adequately reclaimed during and following the mining process. Most coal-mining states now have the primary responsibility to regulate surface coal mining on lands within their jurisdiction, with the Office of Surface Mining (OSM) performing an oversight role.
Under SMCRA, prior to receiving a mining permit, operators must present a detailed and comprehensive plan for reclaiming the land after mining has been completed. The reclamation plan must include, among other criteria, the pre-mining condition and use of the land to be mined; the proposed use of the land after reclamation; an estimated time table for the reclamation; and the steps that will be taken to comply with the relevant air and water quality laws. In addition to providing the reclamation plan, operators must also post a performance bond to ensure that monies will be available to complete the reclamation if the operator goes out of business prior to finishing the reclamation or is otherwise unable to complete the reclamation. The amount of the bond must equal the amount of the proposed reclamation plan. The bond is not released to the operator until after the state or federal regulatory office has concluded that the reclamation is successful, which could be over 10 years after the reclamation process has been completed.
Abandoned Mine Lands Program
Funding for the reclamation of abandoned mines is accomplished through a coal production tax. Mine operators must pay a tax of $0.12 per ton for underground mined coal and $0.28 per ton for surfaced mined coal; the proceeds from this tax are put into the Abandoned Mine Reclamation Fund (created by SMCRA) to pay for the reclamation of abandoned mines. A percentage of the fund is distributed to states with approved reclamation programs for their projects, and the remaining monies are used by the federal government through the OSM to reclaim abandoned mines in states without active programs. As of December 15, 2011, OSM has provided more than $7.2 billion to reclaim more than 295,000 acres of hazardous high-priority abandoned mine sites and for other purposes of abandoned mine lands have been reclaimed through the OSM fund since 1977.
See also
- Clean Water Act
- Environmental remediation
- Holistic management
- Land rehabilitation
- Mine closure planning
- Office of Surface Mining
- Permaculture
- Surface Mining Control and Reclamation Act of 1977SMCRA 1977
References
External links
- The short film A Page In Time is available for free download at the Internet Archive
- Mineral Information Institute (reclamation stories)
- Abandoned Mine Land Reclamation (US Dept. of the Interior)
- American Society of Mining & Reclamation
- Appalachian Coal Country Team
- Appalachian Regional Reforestation Initiative
- Interim Inventory and Assessment of Abandoned Mineral Lands in the National Park System
- National Mining Association
- US Department of Energy
- US Energy Information Administration
Source of the article : Wikipedia
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