Reclamation Rate Research Articles

Quantifying the Cumulative Effects of Large-Scale Reclamation on Coastal Wetland Degradation

Considering the importance of coastal wetlands as key land resources and the ecological degradation caused by large-scale and multi-stage reclamation, as well as the significant synergistic and superimposed effects of reclamation on wetland degradation in temporal and spatial dimensions, it is vital to conduct in-depth research on the impact mechanisms and cumulative effects of reclamation on wetland degradation. However, the existing methods for evaluating these cumulative effects still have some shortcomings in characterizing the spatiotemporal scale. Consequently, it is urgent to introduce or develop a cumulative effect evaluation method based on remote sensing. Taking the Jiangsu coastal wetland as a typical case study area, the present study constructed a cumulative effect evaluation method based on calculus theory combined with landscape succession modeling and statistical analysis. This method was then used to quantitatively analyze the impacts and cumulative effects of reclamation on wetland degradation in the Jiangsu coastal region from 1980 to 2024. The results show that degradation of the Jiangsu coastal wetlands over the last 45 years covered 2931.54 km2, accounting for 46.92% of the area in 1980. This degradation primarily reflects a shift from natural wetland to constructed wetland. In addition, the reclaimed area of 2119.61 km2 is mainly used for aquaculture and agricultural cultivation. The reclamation rate of Jiangsu showed insignificant fluctuations and significant spatial differences. The reclamation rate of the north counties and cities presented a downward trend, while that of the south counties and cities presented an upward trend. Reclamation has a significant impact on wetland degradation, with a contribution rate of 50.62%. The cumulative effect in the study area reached its maximum value in 2015, except for Nantong City. This study provides a new perspective for quantitatively analyzing the impacts and cumulative effects of coastal wetland reclamation and provides guidance for the effective management and sustainable utilization of coastal wetland resources.

Research on collaborative management technology of deep multi-coal seam mining and pre-reclamation in coal-grain composite area

Subterranean coal mining results in the occurrence of surface subsidence, soil degradation, and damage to agricultural lands, which is especially severe in regions with high groundwater levels. The collaborative reclamation scheme combining surface pre-reclamation and underground mining layout optimization can effectively control the problem of damage to farmlands. Hence, it is imperative to study the collaborative management technology. The research area for this study is Jiulishan Mine, located in coal-grain composite areas with a high groundwater table. Initially, a combined UAV and USV measuring system was utilized to acquire spatial data of the proposed reclamation area. Furthermore, we examined the evolution features of the subsidence ponding related to various mining methods using FLAC3D numerical modeling. Ultimately, the ArcGIS spatial analysis module was utilized to model and calculate the reclamation volume and rate for each plan. Our findings indicate that: (1) The extent of damage caused by shallow coal seam mining includes an area of 50.67 hm2 for farmland damaged area (FDA), 31.49 hm2 for seasonal subsidence ponding (SSP), and 23.51 hm2 for perennial subsidence ponding (PSP). Additionally, the boundary subsidence values for each damaged area are 0.8 m, 1.6 m, and 2.8 m, respectively. (2) Through the optimization of deep coal seam mining designs, the spatial configuration of the subsidence basin is successfully altered, creating the necessary condition for the development of a dynamic pre-reclamation plan. (3) The reclamation rate of the optimized pre-reclamation (PR) scheme is significantly higher, ranging from 40 % to 44 %, compared to the reclamation rate of 24 % of the traditional reclamation (TR). The choice of a suitable land reclamation and ecological restoration strategy was determined by optimizing mining plans and considering the characteristics of the subsidence area. This offers empirical evidence and specialized assistance for the ecological rehabilitation of coal-grain composite areas with high groundwater levels.

A Calculation and Optimization Method for the Theoretical Reclamation Timing of Cropland

In mining areas with high groundwater tables, mining subsidence can lead to the inundation of cropland by water, causing damage to cropland and posing a threat to national food security. The implementation of concurrent mining and reclamation techniques can effectively enhance the reclamation rate of cropland. This technique requires engineers to initiate reclamation measures before cropland waterlogging occurs. Therefore, when mining a panel underground, an accurate calculation of the time when cropland becomes waterlogged, known as the theoretical reclamation timing, is crucial. To address this issue, this study proposes a computational method for the theoretical reclamation timing of cropland under the conditions of single-panel mining based on intelligent optimization algorithms. In addition, this paper also proposes an optimization method for the theoretical reclamation timing of cropland within a district based on an intelligent optimization algorithm. Utilizing this method makes optimizing the layout of multiple panels possible, thereby delaying the theoretical reclamation timing for cropland within a district. This approach aims to shorten the duration of reclamation projects and minimize their interference with agricultural activities. Through experimental validation, this paper demonstrates the reliability of these two methods. This study is beneficial for the rational planning of reclamation projects.

Spatio-Temporal Evolution Characteristics and Driving Factors of Typical Karst Rocky Desertification Area in the Upper Yangtze River

Karst rocky desertification (KRD) has become the most serious ecological disaster in the southwest of China and is a major obstacle to the sustainable development of the karst region in the southwest. Remarkably, scientific understanding of the spatial-temporal evolution of rocky desertification and the corresponding driving mechanism is the primary prerequisite crucial to controlling rocky desertification. Hence, the typical rocky desertification area of Qujing City, located in the upper reaches of the Yangtze River, was selected as the research object. On the basis of the Google Earth Engine (GEE) cloud platform and decision tree classification, the spatial-temporal evolution process of rocky desertification in Qujing City from 1990 to 2020 was investigated, and the driving factors of rocky desertification were explored in terms of the natural environment and socio-economic aspects. Consequently, over this period, the area of rocky desertification had decreased by 1728.38 km2, while the no rocky desertification area had increased by 1936.61 km2. Notably, the major driving factors of rocky desertification were fractional vegetation cover (FVC) (q = 0.41), land use type (q = 0.26), slope (q = 0.21), and land reclamation rate (q = 0.21). Typically, rocky desertification is likely to occur in areas with moderate or low FVC (<0.7), a low slope (0–8°) or high slope (35°–80°), a land type of cultivated-land or grassland, and a land reclamation rate of 10–70%. In addition, all two-factor interactions acted as drivers that exacerbate rocky desertification. Furthermore, FVC ∩ slope (q = 0.79) and slope ∩ land use type (q = 0.56) were two interacting drivers that promote rocky desertification strongly.

Study on the Spatiotemporal Evolution and Influencing Factors of Forest Coverage Rate (FCR): A Case Study on Yunnan Province Based on Remote Sensing Image Interpretation

The study of the forest coverage rate (FCR) is related to the ecological environment and sustainable development goals (SDGs) of a region. In light of the lack of an organic integration method of “spatiotemporal evolution, correlation analysis, and change prediction” and the lack of a methodology that integrates methods of “remote sensing (RS) and GIS, multi-phase LUCC, and construction of econometric models” in the research methods at present, this study focus on Yunnan, a typical border province located in China with a relatively fragile “innate” ecological environment, as the research area. Based on the interpretation of land use/land cover (LULC) data retrieved from seven periods RS images (1990, 1995, 2000, 2005, 2010, 2015, and 2020), the spatiotemporal evolution of FCR in 129 counties was analyzed. Complementary research methods, such as the spatial econometric model, geographically weighted regression (GWR), and the geographic detector (GD), are used to reveal the influencing factors of FCR. Finally, this study predicts the FCRs of 129 counties in Yunnan from 2025 to 2050. The FCR in Yunnan presents an increasing trend year by year, increasing from 28.96% in 1990 to 49.05% in 2020. In addition, it exhibits spatial agglomeration characteristics with fewer values in the east and more in the west. The analysis of influencing factors show that the increases in the per capita GDP, land utilization rate, and annual average temperature, and the implementation of the Conversion of Cultivated Land into Forest Project (CCFP) will significantly improve the FCR, while the increases in the population density land reclamation rate, the proportion of construction land area, and the proportion of soil erosion land area will significantly reduce the FCR. Furthermore, the FCR is influenced by multiple factors, and the relative factors observed not only show significant spatial differences, but also present complex and diverse patterns, with the additional characteristics of being interwoven and overlapping. This study contributes to expanding and improving the methods and pathways of exploring the spatiotemporal evolution characteristics of FCR in ecologically fragile areas using RS methods, providing a reference for increasing FCR and improving the ecological environment’s quality in Yunnan Province and other ecologically fragile areas.

Assessment of the success of canopy cover revegetation of former coal mine lands with Forest Canopy Density (FCD) Model in Kutai Kartanegara, East Kalimantan

Coal mining plays a vital role in Indonesia's economic growth. However, these activities negatively impact the environment. To minimize this, the Indonesian government requires ex-mining land to be reclaimed, with one of the success criteria being canopy cover. Until now, there has been no measurable method that can determine the success rate of canopy cover on reclaimed land. This research was conducted to develop a measurement method based on remote sensing data using the Forest Canopy Density (FCD) Model, which is applied in Company X, Kutai Kertanegara. The FCD Model consisted of four biophysical indices, including AVI, BSI, SI, and TI, obtained from Landsat 8 OLI TIRS imagery from 2013–2021. The Kolmogorov-Smirnov normality test was performed before testing the relationship between FCD values and canopy cover using linear regression to obtain the canopy cover success value based on the FCD value. The FCD showed an increasing trend yearly, especially in the first two years after planting. Regression analysis showed a strong relationship between FCD values and canopy cover values, with R2=0.775, and revealed that 75.35 is the FCD value threshold for a successful canopy cover in the reclamation area. This study shows that the FCD approach can be applied to determine the success rate of reclamation in post-mining areas.

EVALUASI PELAKSANAAN REVEGETASI PADA LAHAN PASCATAMBANG BATUBARA (STUDI KASUS DI PT. X DI KABUPATEN TANAH BUMBU PROVINSI KALIMANTAN SELATAN)

Coal mining company in PT. X, in Tanah Bumbu District, South Kalimantan Province, uses the open-pit mining method, causing the initial vegetation loss of an area. PT. X has rehabilitated areas affected by mining by reclamation and revegetation to comply with government regulations. The types of vegetation that grew in the post-mining land revegetation area in the planting years 2012, 2014 and 2016 were acacia (Acacia mangium WILLD), trambesi (Samanea saman), sea sengon (Paraserianthes falcataria), and woody and fruit plants such as mahogany (Swietenia macrophylla), agarwood (Aquilaria moluccensis), meranti (Shorea Spp.), sungkai (Peronema canescens), rubber (Hevea brasiliensis), durian (Durio zibethinus), jackfruit (Artocarpus heterophylla), cashew (Anacardium occidentale), mango (Mengifera indica) and galam (Melaleuca cajuputi). Land characteristics have a steep slope of 35° in 2012 and range from 5°-20° in 2014 and 2016 The drainage system for planting years 2012, 2014 and 2016 looks good no erosion strains, planting years 2014 sites are flooded. The results of soil analysis are pH 4.48 - 4.97; the value of C-organic compounds 0.20% (very low) - 1.33% (medium); P2O5 1.89 mg/100g-1 (very low) - 40.10 mg/100g-1 (high); K2O with values of 8.57 mg/100g-1 (low) - 15.50 mg/100g-1 (medium), 0.20 me/100g-1 (very low) – 19.59 me/100g-1 (low); Mg-exchange at a value of 0.10 me/100g-1 (very low) - 0.20 me/100g-1 (low); Na-exchange of 0.05 me/100g-1 - 0.10 me/100g-1 is low; K-exchange with a value of 0.03 me/100g-1 - 0.05 me/100g-1 is very low, CEC 27.85 me/100g-1 - 52.48 me/100g-1 is low, saturation 0.95% (very low) - 41.56 (high). Based on the success rate of reclamation with revegetation parameters according to the Regulation of the Minister of Forestry No.P.60/Menhut-II/2009, it can be concluded that the success of revegetation obtained for the overall value with an overall value of 24 out of the target value of 50 with a percentage of plant growth of 27%, then the success value of revegetation is categorized as low.

Integrated Mining and Reclamation Practices Enhance Sustainable Land Use: A Case Study in Huainan Coalfield, China

In the coal-grain composite area (CGCA) of eastern China with a high groundwater table (HGT), underground coal mining subsidence has caused extensive submergence of farmland, posing a significant threat to regional food security. Currently, land reclamation techniques in mining subsidence areas primarily focus on post-mining reclamation (PMR) of stable subsidence land with a low reclamation rate. This study investigated the application of concurrent mining and reclamation (CMR) technology for unstable subsidence land in a representative HGT mining area, namely the Guqiao Coal Mine in the Huainan Coalfield. Firstly, mining subsidence prediction and geographic information technology were employed to simulate the spatio-temporal evolution of dynamic mining subsidence, taking into consideration the mining plan. Subsequently, phased reclamation parameters were quantitatively designed by integrating the dynamic mining subsidence and surface reclamation measures. Lastly, scenario simulations were conducted to discuss the effectiveness of CMR in comparison with non-reclamation (NR) and PMR. Additionally, reclamation and ecological restoration strategies for coal mining subsidence areas with comprehensive governance modes were proposed. The findings indicated that mining activities have led to a reduction in both the quantity and quality of original farmland, with 70% of the farmland submerged and rendered uncultivable. In contrast to PMR, which achieved a reclamation rate of 29%, CMR can significantly increase the farmland reclamation rate to 69% while also prolonging the service life of farmland. This study provides theoretical support and technical references for promoting sustainable mining practices, protecting farmland, and facilitating the high-quality development of coal resource-based cities.

A novel method for identification of disturbance from surface coal mining using all available Landsat data in the GEE platform

Coal mining has contributed to a solid and stable global economy. Surface mining and underground mining are the principal methods for extraction of coal worldwide and given the developments in mining technology and equipment, these methods are increasingly generating more and more coal. Surface mining is also a subject that cannot be overlooked in the context of sustainable development because amongst human activities it causes comparatively strong land disturbance. Much of the damage and assessment of land and ecosystems from surface mining occurs at the site, and at the regional scale; hence access to the mining data is limited. Moreover, it is difficult for remote sensing to extract information on larger-scale areas with high precision. As a consequence, a frequency index of open coal mining can be created by merging the vast high-resolution images acquired by Landsat sensors with the spectral properties of open coal scraped from the overburden layer. Such indices and morphological principles can be used to develop strategies for quickly identifying the open coal boundaries in a vast area without mine-related information. In addition, LandTrendr may be used to reconstruct the spatial and temporal processes of surface disturbance and remediation caused by regional surface coal mining to identify surface mining disturbance and reclamation. Seven typical mining locations worldwide were selected to test and confirm the proposed method's practicality and robustness, including delivering accurate findings based on randomly testing sample points and comparing the mature data outputs. The results showed that: (1) the overall accuracy of the open coal areas identified by the OCFI (Open Coal Frequency Index) was over 85 % (range 0.85–0.96). In all study areas, the accuracy of recognizing disturbance and reclamation events was greater than 76 %. (2) The surface mining disturbed 3046.42 km2 of land and 1487.39 km2 was reclaimed in the seven mining areas investigated between 1986 and 2018, resulting in a reclamation rate of 48.82 %. The proposed method is more accurate and faster in identifying open coal locations than the current commonly used land cover datasets based on comparisons with other data products. The approach can extract surface coal mining in the absence of mining data and offer precise boundary data for mining research, which can be extremely useful for extending mining operations.

Evaluasi Reklamasi di Area Pertambangan Batubara PT. PQ, Kecamatan Tanjung Kidul, Kabupaten Muara Enim, Provinsi Sumatera Selatan

Coal mining activities carried out by PT. PQ causes a change in the environmental setting so that its function needs to be restored according to its designation. The return of land function is carried out through reclamation activities. Reclamation activities need to be evaluated in order to continue to make improvements and optimal results. This study assesses the success rate of reclamation carried out by PT. PQ. This study aims to examine and evaluate the reclamation activities carried out by PT. PQ is based on Decree of the Minister of Energy and Mineral Resources Number 1827/30 K/MEM of 2018. The research method used is field observation; analysis of primary and secondary data on land use, revegetation, and maintenance stages; and mathematical calculation of reclamation success rate. Soil quality was tested by testing the pH of H2O, organic C, and total N. The results showed that the soil in the reclamation area is considered to be acidic, namely the pH of H2O is 4.5 -5.5; organic C by 1-2%; N total of 0.1 – 0.2%; C/N of 5 – 1 test for pH H2O, organic C, and N total reclamation success rate of 94.1 or in the good category. The soil in the reclamation area has a pH of 4.3 and a soil organic C content of less than 1%. The main eucalyptus oil plants require soil with a pH of 4.5 -5.5. organic C by 1-2%; N total of 0.1 – 0.2%; C/N of 5 – 1. To complete the reclamation activities, it is necessary to increase the pH of the soil, which is still acidic, namely 4.3 and to increase the organic C content of the soil, which is still low, namely <1%. Findings of acidic soil pH and soil organic C content below the standard needed for the main plant eucalyptus oil are initial information for improving soil conditions in the reclamation area of PT. PQ so that reclamation activities run better.

ANTHROPOGENIC TRANSFORMATION OF THE LYUTITSA RIVER BASIN

The Liutytsia is a typical small river of the Polissya part of the Volyn region. It flows through the territory of Rozhyshche and Kopachivka united territorial communities. The river is 37 km long, with a catchment area of 208 km2, 3.6% forest cover, 1.4% marshland, and 60.5% ploughed. About 10,000 people live within the basin. The territory has long been developed. Agricultural use predominates. Specialisation: growing potatoes, cereals, industrial crops, dairy and meat farming and processing of agricultural products. In the structure of land use in the basin, 87.6% of the land is used for agricultural purposes. All land available for agricultural use has been ploughed and is actively used. Within the basin, the permissible land use limits are exceeded. This contributes to the aggravation of the environmental situation and requires the implementation of measures for the rational use of natural resources and nature protection. 8.8% of the basin's territory is occupied by settlements, industrial, transport, communications, etc. The basin's water resources are also actively used. Most of the water is used for water supply to the population, industry and agriculture. In a year of 95% runoff availability, total water withdrawals exceed 20% of the annual runoff, and irreversible water consumption in the basin is 15%. In the future, runoff shortages may become a problem in low-water years. The frequency of dry years has been increasing recently. The concentration of most chemicals in the river water does not exceed the maximum permissible concentration. The content of ammonium nitrogen exceeds the per capita values by 15.6 times in the first and 2.92 times in the river channel 2, nitrite nitrogen by 1.7 times and 1.91 times, respectively, and total iron by 16 times and 2.4 times. The excessive content of nitrogen compounds is caused by surface runoff from urban areas, fields, farms, and spontaneous solid waste dumps. The area of drained land within the basin is 8,606 thousand hectares, with a land reclamation rate of 41.4%. There are 5 drainage systems within the basin. Soil overdrainage is widespread within the basin's drainage systems, leading to loss of soil cohesion, loss of vegetation cover and deflation. With distance from the drainage network, water drainage is worse, there are waterlogged areas, rewetting occurs due to inefficient drainage channels that are silted and overgrown with vegetation. Some reclaimed areas have not been ploughed for many years and are overgrown with selfseeding. Hazardous exogenous processes are occurring within the basin: karst, secondary waterlogging, and siltation of the riverbed. Soils are also undergoing negative changes. Erosion processes are occurring, the depth of the humus horizon is decreasing, and the content of humus and plant nutrients is decreasing. Environmental problems in the basin include: violation of water protection zones, ploughing and rewetting of the floodplain; lack of hydroecological monitoring in the river basin; poor condition of drainage systems; lack of soilprotective technologies for growing crops, violation of recommendations for the use of drained land; illegal landfills in the basin; low forest cover, lack of protected areas within the basin, lack of an effective local ecological network.
 Keywords: river basin, geoecological state of the basin, sources of anthropogenic impact within the basin, anthropogenic transformation of the basin.

Bringing Opiates Off the Streets and Undertaking Excess Scripts: A novel opiate reclamation and prescription reduction program

BackgroundOpioid diversion and misuse continue to present problems in modern medicine. The “opioid epidemic” has claimed more than 250,000 lives since 1999, with studies pointing to prescription opioids as the culprit for future opiate misuse. Currently, there are no well-described, data-driven processes to educate surgeons on reducing opiate prescribing, informed by personal practice patterns. We designed and implemented a novel opiate reclamation and prescription reduction program for surgeons to reclaim unused medications and decrease prescribing using individual provider data. MethodsWe performed a prospective collection of all unused opiate pain medications for general surgery postoperative patients from July 15, 2020 to January 15, 2021. Patients brought their unused opiates to their routine postoperative follow-up appointment, where they were counted and disposed of in a secure drug take-back bin. Reclaimed opiates were totaled, analyzed, and reported to the providers, who used their individual reclamation rates to refine prescribing habits. ResultsDuring the reclamation period, 168 operations were performed, with a total of 12,970 morphine milligram equivalents of opiate prescribed by 5 physicians. A total of 6,077.5 morphine milligram equivalents (46.9%) were reclaimed, which is the equivalent of 800 5-mg tablets of oxycodone. A review of these data led to a 30.9% decrease in opiate prescriptions by participating surgeons in addition to the reclamation of an additional 3,150 morphine milligram equivalents over the next 6 months. ConclusionContinuous monitoring of the medications returned by patients now continues to inform our providers’ prescribing practices, decreases the amount of opiates in the community, and improves patient safety.

Coupling of underground coal mining and mine reclamation for farmland protection and sustainable mining

Mining-induced subsidence inevitably caused damage to farmland and created newborn ponding in mining areas with high groundwater tables. However, traditional mining and reclamation (TMR) is characterized by low reclamation and long-term farmland abandonment. Here, two critical width models of the skip-panel and the back-panel were proposed to protect farmland and increase the reclamation rate. Secondly, concurrent mining and reclamation (CMR) and TMR were simulated according to mining-induced subsidence and farmland damage patterns. The advantages of CMR were discussed in comparison with TMR. The results show that: 1) The layout of underground mining was optimized to successfully achieve farmland protection; 2) The overall and staged layouts of mine reclamation were optimized by incorporating final settlement and earthwork balance; 3) The proposed earthwork allocation allowed lower pre-filling heights and rapid reclamation; 4) CMR can prolong the life of farmland by 12.5 years and increase reclamation rate and farmland area by 50.31% and 869.40 ha; 5) CMR has high costs in the short term, but has good social and ecological benefits in the long term. In terms of policy, we recommend the government increase the reclamation rate index and encourage enterprises to adopt CMR. CMR is the realistic need for sustainable mining and will gradually become a new hotspot for scientific mining. This study can provide a reference for sustainable mining and land use management in coal resource-based cities with high groundwater tables.

Assessment of Cultivated Soil Contamination by Potentially Toxic Metals as a Result of a Galvanizing Plant Failure

Zinc is one of the more mobile metals in the soil and thus involves the risk of entering the food chain. Zinc compounds are used in the galvanization process, which is assumed to be safe for the environment. However, random events or failures such as unsealing bathtubs with liquid zinc or hydrochloric acid, as well as violent fires in industrial halls, may pose a real threat to the environment, including human health. Therefore, this research was carried out to determine the content of zinc and selected potentially toxic metals in arable soils after a failure in a galvanizing plant located in the village of Dębska Wola (southeastern Poland). In addition, the potential risk associated with excessive accumulation of identified pollutants in the environment was assessed. In order to determine the level of contamination, soil samples were taken, and basic physical and chemical properties were analysed. The concentrations of Zn, Pb, and Cd in the soil were determined using the atomic emission spectrometry technique with inductively coupled plasma (ICP-OES), and pH measurements were performed using the potentiometric method after prior wet mineralisation of the research samples. The analysed samples had a varied pH of the organic–mineral horizon from pHH2O 4.66 to pHH2O 5.33 and from pHKCl 3.89 to pHKCl 5.06. As a result of a failure, toxic metal fumes were released into the atmosphere, causing concentrations of Zn in the soil samples from 0–5 cm in the range of 1201–2007 mg∙kg−1, as well as Pb (109–509 mg∙kg−1) and Cd (4.6–17 mg∙kg−1). High contents of zinc and lead found in several soil samples are of anthropogenic nature and require detailed monitoring in order to eliminate the risk associated with their accumulation. The study area should be re-analysed to determine the rate of reclamation of degraded soils.

PENGGUNAAN PARAMETER VEGETASI DALAM MENENTUKAN TINGKAT KEBERHASILAN REKLAMASI

Mining activities in forest areas are carried out by granting borrow-to-use permits for forest areas by taking into account area limitations and certain time periods as well as environmental sustainability. Problems caused after mining include infertile soil, acidic pH, and low nutrients. These problems can be overcome by reclamation activities to improve and restore land functions to a better and more productive condition. Reclamation activities carried out include land arrangement, erosion and sedimentation control, and revegetation (Ministry of Forestry, 2009). The approach used in this study is descriptive quantitative, with a research implementation time of 6 (six) months. The object of this study is the object of this study is the assessment of reclamation and revegetation in the 2016 and 2017 planting years at PT. Binuang Mitra Bersama in Block 1 and PT. X in Block 4 based on Minister of Forestry Regulation No. P.60/Menhut-II of 2009 concerning Guidelines for Evaluating the Success of Forest Reclamation and Decree of the Minister of Energy and Mineral Resources Number 1827K/30/MEM/2018 of 2018 concerning Guidelines for Implementing Good Mining Engineering Principles. The results of the assessment of the success rate of reclamation based on the parameters of revegetation according to KEPMEN ESDM NO. 1827 K/30/MEM/ 2018 for PT. BMB reached 66.19% or good criteria, for the percentage of plant growth was 85%, included in the good category with 80% planting local types of plants and PT.X reached 57.62% or not good criteria because the results of the assessment of planting cover crops were only 0 .5%, planting fast growing plants is only 2% and planting local plant species is only 1%. While the results of the assessment of the success rate of reclamation are based on the parameters of revegetation according to the Minister of Forestry Regulation no. P.60/Menhut-II Year 2009 for PT. BMB reaches 75% with a good success rate, for planting indicators with 4 (four) parameters weighing 4 (four) values and 1 (one) parameter weighing 1 (one) because the presentation is only 33.86% categorized as reclamation <60%, this because there are still temporary residential buildings and places for standby equipment for excavators and PT.X, the plant health value reaches 55%, the success rate is included in the bad category.

Рекультивация нарушенных горным производством земель с учетом особенностей отвода земель под предприятия горной промышленности

Mining production is one of the important components of the economic development of the Russian Federation. But in the process of mining, environmental damage is caused, which must be compensated by reclamation (restoration). However, to date, the reclamation rate is inferior to that of extraction. A special feature of the legal regime of subsoil use is the dual form of land allocation: subsoil use (the Law of the Russian Federation «On Subsoil») and land use (the Land Code of the Russian Federation). In this paper, the technologies of parallel reclamation of sections (quarries) are considered, the project of which should be contained in a set of documents for obtaining a license for the development of subsurface resources. Parallel reclamation without using the mined-out space of the quarry involves the use of overburden rocks as materials for the construction of large-scale linear infrastructure facilities of the district, etc. Parallel recultivation using the developed space of the quarry (section) involves filling it with either current overburden rocks or recultivant obtained based on the mineral processing products or technogenic raw materials. At the same time, it is required to ensure that at least one side of the quarry is placed in the limit position in the absence of any communications on it. A prerequisite for the implementation of this approach is mandatory long-term planning. The reclamation plan and its direction should be developed before the start of mining operations in accordance with the needs of the region, and then consistently implemented. The necessary legislative and regulatory framework is available in Russia, but it needs to be finalized, in particular, clarification of the concept of reclamation. In this case, it is interpreted as the return of land to a new economic turnover. Close cooperation and interaction of business with the federal and regional authorities, scientific and design organizations is required to restore the lands disturbed by mining production in accordance with the current laws and regulatory framework in order to develop and implement geotechnological solutions that ensure the return of these lands to a new economic turnover.

KEBERHASILAN REKLAMASI LAHAN BEKAS TAMBANG BATUBARA STUDI KASUS IZIN USAHA PERTAMBANGAN DI KABUPATEN TANAH BUMBU PROVINSI KALIMANTAN SELATAN

The assessment of the success rate of reclamation uses a reference assessment of PERMENHUT 60 of 2009 with scoring of three criteria, namely: Land arrangement with a score of 30%, control of erosion and sedimentation with a score of 20%, and revegetation with a score of 50%. The reclamation success rate assessment result based on the total score is both >80, medium 60-80, and ugly <60. The implementation of reclamation of mining business permits based on the calculation of the total value obtained a value of 48.5 which shows that the reclamation results are included in the ugly criteria (reclamation results are unacceptable and intensive maintenance is needed), so it is necessary to carry out reclamation repairs. The reclamation criteria that received a less assessment was the implementation of revegetation which had the lowest value, namely, 14 out of 50 weights and erosion and sedimentation control had a value of 12 out of 20, while land management had a value of 22.5 out of a weight of 30. Activities that can be carried out to improve reclamation on former mining business permit land are land management, reducing landslides, erosion, and sedimentation, improving the quality of physical and chemical soil properties with regular fertilization and liming, spraying pesticides, cleaning cover crop windings on plants periodically carried out, reselecting cover crops, selecting sengon plants as pioneer plants, selection of jackfruit plants as local insert crops, then the commitment of policymakers in the implementation of reclamation, fulfillment of labor competencies, remaking of erosion and sedimentation control facilities, and providing facilities and infrastructure for breeding diverse plants.

Study on Ecological Restoration Technology of Mine Wasteland

Mining destroys the environment and occupies arable land, causing serious social problems. In recent decades, land reclamation and ecological restoration of mine wasteland have become a hot topic of interdisciplinary research. However, compared with developed countries in Europe and America, China's mine wasteland work has the characteristics of low land reclamation rate and poor reclamation quality. This paper discusses the soil reconstruction technology, physical and chemical improvement technology and vegetation restoration technology of land reclamation. At the same time, it is believed that the research on the ecological environment impact mechanism of mine wasteland should be strengthened. In the later stage, modern advanced technologies, such as 3S technology and information system technology, should be used to assess and supervise the reclamation work, and strive to achieve the technical breakthrough in the environmental damage mitigation of mine wasteland, and establish the theoretical system and technical specifications for the reclamation and ecological restoration of mine wasteland.

Reconstructing spatial pattern of historical cropland in karst areas of Guizhou, Southwest China

Karst regions are exceptionally responsive to global change with their harsh natural environment, fragile ecology, and acute human-land conflicts. The reconstruction of cropland spatial pattern in karst areas during the historical period is typical for studying human-land relations in karst areas and has important practical significance for climate study. The ecological environment changes at regional and global scales, primarily to provide essential data and a theoretical basis for studying the inverse evolution of rock desertification in karst areas. Guizhou province, a typical karst area, was selected as the research area in 1820. Based on the correction of historical population data and cropland data, a reconstruction model of cropland spatial pattern in karst areas during the historical period was constructed by selecting factors such as elevation, slope, soil types, organic matter content, climatic productivity potential, distance to river and distance from settlements to reconstruct the spatial pattern distribution of cropland in 1820 of Guizhou. The results show that the data on cropland recorded in Guizhou during the Qing dynasty is too low, mainly due to Yin-Ni and the policy of Tu-Di-Mian-Ke. In 1820, the total area of revised cropland in Guizhou was 1,851,792 hm2, with the highest proportion of 14.32% in Dading Fu and the lowest in Songtao Ting at 1.6%. Only 30% of the grid in Guizhou has a cropland distribution. It is mainly concentrated in the central part of Qianzhong District (Anshun and Guiyang Fu), the southern part of Qianbei District (Pingyue Fu and southern Zunyi Fu), the western part of Qiandongnan District, the central and eastern parts of the Qiandongbei District. The overall average reclamation rate of land in Guizhou is 10.93%, the highest reclamation intensity in Qianzhong District, with 8.5% of grids ≥ 50%, and the smallest in Qianxinan District, with only 1.65% of grids ≥ 50%. The analysis is validated by comparing the reconstruction model and the reconstruction results. It can be seen that the reconstruction model and research results of this paper can more objectively reflect the distribution of cropland in karst areas during the historical period, and the reconstruction model is suitable for karst areas with low productivity levels.

Using POI and time series Landsat data to identify and rebuilt surface mining, vegetation disturbance and land reclamation process based on Google Earth Engine

The development of coal resources is necessary, but it has a huge negative impact on land, ecology, and the environment. With the increasing awareness of environmental protection and the requirements of related regulations, the design and practice of reclamation projects run through the mining life cycle and continue for a long time after the coal production. High-precision monitoring of mining disturbance and reclamation, quantifying the degree and time of vegetation disturbance and restoration, is of great significance to minimize the environmental effect of mining. Remote sensing, widely used as efficient monitoring tool, but there is not enough research on disturbance and reclamation monitoring taking into account large-scale areas and high temporal and spatial accuracy. Especially when mining sites remain unknown, how to distinguish the disturbance of coal mining and other human activities affecting the surface land cover has become a challenge. Therefore, this paper proposed a method to reconstruct the time series of mining disturbance and reclamation in a large area by using the POI (point of interest) and Landsat time series images using multiple buffer analysis methods. The process includes: (1) Retrieval of POI in the study area based on the public mining list using Python crawler, and buffering 100 km for preliminary extraction of potential mining areas; (2) Using spectral index mask and random forest algorithm to accurately extract the exposed coal on the Google Earth Engine (GEE) platform; (3) Buffering 10 km to identify the occurrence of disturbance and reclamation, using pixel-based temporal trajectory identification of LandTrendr algorithm under GEE. The method successful detect the change points of surface coal mining disturbance and reclamation in eastern Inner Mongolia of China. The results show that: (1) The method can effectively identify the extent of surface coal mining disturbance and reclamation, and the overall extraction accuracy is 81%. (2) Surface coal mining disturbance in eastern Inner Mongolia was concentrated in 2006–2011. By 2020, the total disturbed area is 627.8 km2, with an average annual disturbance of 18.5 km2, and the annual maximum disturbance to the ground reached 64.6 km2 in 2008. With the total reclaimed area being 236.3 km2, the reclamation rate is about 37.6%. This study provides a systematic solution and process for monitoring the disturbance and reclamation of surface coal mining in a large range with little known about the mines’ location. It can effectively identify the mining disturbance and reclamation process which can also be extended to other areas, providing a quantitative assessment of mining disturbance and reclamation, which can support further ecological restoration decision-making.