Reclamation of high-elevation, acidic mine waste with organic amendments and topsoil.

The Summitville Mine was a high-elevation (3500 m) gold mine in southwestern Colorado. The mine was abandoned in 1992, leaving approximately 200 ha of disturbance comprised partially of an open pit, a cyanide heap leach pad, and two large waste rock piles. Reclamation of these mine facilities is challenging due to extreme climatic conditions in conjunction with high acid-production potential and low organic matter content of waste materials on site. In addition, stockpiled topsoil at the site is acidic and biologically inactive due to long-term storage, and may not be suitable for plant growth. The purpose of this study was to evaluate the effects of organic amendments (mushroom compost vs. biosolids) and topsoil (stockpiled vs. nonstockpiled) on aboveground biomass and plant trace element uptake. An on-site field study was established in 1995 to identify the most effective combination of treatments for successful reclamation of on-site waste rock materials. Incorporation of organic matter significantly increased aboveground biomass, with mushroom compost being more effective than biosolids, but did not significantly influence trace element uptake. Conversely, the use of topsoil did not affect aboveground biomass, but did influence trace element uptake. Treatments that received topsoil supported plant growth with significantly higher trace element tissue concentrations than treatments that did not receive topsoil. In general, it was found that waste rock could be directly revegetated when properly neutralized, fertilized, and amended with organic matter. Additionally, stockpiled topsoil, when neutralized with lime, supported plant growth equivalent to that on nonstockpiled topsoil.

[1]  D. W. Nelson,et al.  Total Carbon, Organic Carbon, and Organic Matter , 1983, SSSA Book Series.

[2]  M. Paschke,et al.  Zinc toxicity thresholds for important reclamation grass species of the western united states , 2000 .

[3]  E. Redente,et al.  Reclamation of waste rock material at the Summitville Mine Superfund site using organic matter and topsoil treatments , 1999 .

[4]  E. Redente,et al.  Evaluating the phytotoxicity of Pb-Zn tailings to big bluestem (Andropogon gerardii Vitman) and switchgrass (Panicum virgatum L.). , 1999 .

[5]  H. T. Williams,et al.  APPLICATION OF AMELIORATIVE AND ADAPTIVE APPROACHES TO REVEGETATION OF HISTORIC HIGH ALTITUDE MINING WASTE , 1999 .

[6]  D. Sparks,et al.  Methods of soil analysis. Part 3 - chemical methods. , 1996 .

[7]  S. Olson,et al.  Crop production with mushroom compost , 1995 .

[8]  D. Ueckert,et al.  Selective-placement burial of drilling fluids: effects on soil properties, buffalograss and fourwing saltbush after 4 years , 1994 .

[9]  J. Pichtel,et al.  Comparison of Amendments and Management Practices for Long‐Term Reclamation of Abandoned Mine Lands , 1994 .

[10]  D. Sauerbeck.  Plant element and soil properties governing uptake and availability of heavy metals derived from sewage sludge , 1991 .

[11]  D. Coleman,et al.  Reduction of microbial and faunal groups following application of streptomycin and captan in Georgia no-tillage agroecosystems , 1991 .

[12]  J. Stark,et al.  Plant uptake and cycling of trace elements on retorted oil shale disposal piles. , 1990 .

[13]  E. Lyle.  Surface mine reclamation manual , 1987 .

[14]  J. Stark,et al.  Trace Element and Salt Movement in Retorted Oil Shale Disposal Piles , 1986 .

[15]  J. H. Williams,et al.  Long-term effects of sewage sludge and farm slurries applications , 1985 .

[16]  F. Korte,et al.  Side effects of some pesticides on non‐target soil microorganisms , 1985 .

[17]  Rufus L. Chaney,et al.  Plant uptake of inorganic waste constituents , 1983 .

[18]  J. Parr,et al.  Land treatment of hazardous wastes. , 1983 .

[19]  L. C. Bliss,et al.  Tundra ecosystems: a comparative analysis. , 1983 .

[20]  F. J. Stevenson.  HUmus Chemistry Genesis, Composition, Reactions , 1982 .

[21]  M. Samuel,et al.  The Value of Fresh-stripped Topsoil as a Source of Useful Plants for Surface Mine Revegetation , 1979 .

[22]  H. Aubert,et al.  Trace elements in soils , 1978 .

[23]  A. P. Schwab,et al.  A new soil test for simultaneous extraction of macro‐ and micro‐nutrients in alkaline soils , 1977 .

[24]  R. E. Call.  THE CHEMISTRY OF SOILS. , 1892, Science.