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- W2551036745 abstract "ABSTRACT An infiltration test plot study has been initiated at the Questa mine, located in the Sangre de Cristo Mountains in northern New Mexico. The objective of this study is to determine the key processes controlling infiltration into the mine rock piles. This study is part of a comprehensive site investigation carried out in support of the development of a closeout plan for the Molycorp Questa Mine. From 1965 to 1983 large-scale open pit mining at the Questa mine produced over 300 Mio tons of mine rock, which was end-dumped into various steep valleys adjacent to the open pit. As a result, the mine rock piles are typically at angle of repose and have long slope lengths (up to 2000 ft), and comparatively shallow depths (~100-200 ft). Initial analyses suggested that net infiltration may vary significantly across the site due to differences in the local micro-climate (caused by differences in elevation and aspect). In order to account for these differences, test plots were located on sites representative of low, mid and high elevation conditions. The test plots consist of 92” deep HDPE tanks (94” dia), which were backfilled with local mine rock material. The lysimeters are instrumented with suction and temperature sensors as well as access tubes for measuring volumetric moisture content at various depths. The lysimeters are free-draining and leachate from the test plot is monitored using a tipping bucket. An automated weather station was erected at each site to monitor all relevant climate parameters. This paper describes the design and installation of these test plots and summarizes monitoring results obtained to date. The results of this infiltration study will be used to assess the effectiveness of alternative closure measures." @default.
- W2551036745 created "2016-11-30" @default.
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- W2551036745 date "2001-01-01" @default.
- W2551036745 modified "2023-09-25" @default.
- W2551036745 title "INFILTRATION TEST PLOT STUDY FOR MINE ROCK PILES AT QUESTA MINE, NEW MEXIC0" @default.
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- W2551036745 doi "https://doi.org/10.21000/jasmr01010195" @default.
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