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- W2187804550 abstract "The Molycorp molybdenum mine in north-central New Mexico operated as an open pit mine from the mid 1960s to the early 1980s. The overburden piles generated during this operation are heterogeneous in respect to rock types containing neutral rock types as well as mixed volcanic rock types. The mixed volcanic rocks are highly weathered materials with low pH and high salinity resulting from pyrite oxidation. Undisturbed areas surrounding the mine site having similar mixed volcanic rock types as found in the overburden piles, support vegetation indicating there may be native plants in this climatic region which are adapted to low pH conditions and associated soluble constituents found in these materials. This study was set up to evaluate the survival of different native and exotic plant materials across a range of overburden materials found at the Molycorp site. Determining what species can survive on the different overburden materials is instrumental in implementing an effective reclamation program at the site. Two overburden rock types representing both the mixed volcanic rock types and the neutral rock types, were crushed and mixed to generate 4 different overburden materials. These materials ranged in pH from 2.7 to 4.4 and had electrical conductivities ranging from 1.9 to 3.6 ds/m. The overburden materials were placed into IS-gallon horticultural pots located at the Mora Research Center, Mora, N.M. The study used 164 cm 3 container transplants of the following 52 plant types: ten conifer species, 16 legume species, five species of forbs and sub-shrubs, and 21 shrub species. The study was initiated in June 1995 and survival evaluated in June 1996. Survival results for species are presented. When 70% survival and a vigor rating of good are used as the criteria for determining potential for a species to be used in the reclamation program 42 and 38 species would be suitable for the two overburden materials with the highest pH and lowest EC, respectively. In the substrate with the second lowest pH (3.3) and second highest EC (3.2 ds!m), 21 species or sources had greater than 70% survival. In the most acidic overburden having the highest EC (3.6 dslm), six coniferous tree species and three shrub species had greater than 70% survival. As an initial screening tool this study has provided information on species with potential for direct establishment on low pH «3.3), high Ee (>3.2 dslm) overburden." @default.
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- W2187804550 date "2001-01-01" @default.
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- W2187804550 title "RESULTS OF SPECIES TRIALS ON LOW pH OVERBURDEN MATERIALS FOR MINE LAND RECLAMATION" @default.
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- W2187804550 doi "https://doi.org/10.21000/jasmr01010112" @default.
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