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| Technical analysis of soil and water conservation monitoring supplemented to mining projects |
| LIU Jinpeng, CHEN Yujin |
| Institute of Geological Natural Disaster Prevention and Control, Gansu Academy of Sciences, 730000, Lanzhou, China |
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Abstract [Background] For many mine projects, it is particularly difficult to supplement soil and water conservation monitoring because of long production cycle and complex construction process. The key problem to improve the quality of soil and water conservation monitoring work is to supplement the historical data of soil and water conservation monitoring reasonably.[Methods] Taking a lead-zinc mine in Gansu province with a mining history of over 30 years as the research object, the monitoring work of soil and water conservation in the mine was completed by consulting construction data, measuring the current situation, consulting the mine's senior workers and supplementing the analysis of historical remote sensing image data from 1990 to 2019 and using the calculation methods in the SL773-2018 Guidelines for Measurement and Estimation of Soil Erosion in Production and Construction Projects. [Results] 1) The mine tailings pond area was increasing, the change of the other area was mainly related to the construction progress, and in 2006 turn to stability after the underground mining.2) The total dug earthwork was 24.73×106 m3, the total backfilled earthwork was 2.05×106 m3, and the discarded earthwork was 22.58×106 m3. 3) During the construction period, the key soil loss area was transportation roads, with soil loss of 2 197 t, accounting for 42.76% of the total. In the operation period, the key soil loss area was the open-pit mining area, with soil loss amount of 60 418 t, accounting for 85.74% of the total. 4) During the period of production and construction, the average erosion modulus of each area gradually decreased from 3 494 t/(km2· a) to 193 t/(km2· a).[Conclusions] The primary part is to accurately investigate the important time nodes in the process of mine construction and production when conducting the supplementary work of soil and water conservation monitoring in mining projects, the emphasis is to analyze the change of disturbed land area in each construction period, and the difficulty is to calculate and analyze soil erosion. Based on the research findings, some suggestions are put forward, i.e., the basic price system of water conservation monitoring fees should be introduced, the supplementary monitoring report should be carried out according to the year or the period with significant change characteristics, and the measurement guidelines flexibly should be applied in combination with actual situations.
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Received: 03 October 2020
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