Mapping a hazardous abandoned gypsum mine using self …
Request PDF | Mapping a hazardous abandoned gypsum mine using self-potential, electrical resistivity tomography, and Frequency Domain Electromagnetic methods | This paper is the first phase of an ...
Sensors | Free Full-Text | Characteristics of Micro-Seismic …
(a) Gypsum mining via the room-and-pillar method creates a mining void area that disrupts the equilibrium of the rock in its natural state. (b) When the thickness of the overlying strata in the goaf is sufficient to provide space for the expansion of the stress arch, the span of the stress arch is greatly increased, forming a support structure ...
Gypsum mining spoil improves plant emergence and …
soil and gypsum mining spoil, with the aim of assess-ing for the rst time the potential use of gypsum min-ing spoil to enhance soil properties, to reduce PHE mobility and availability in soils and, thus, to promote plant performance. Materials and methods Experimental design In order to test the remediation capacity and the suit-
Study on damage characteristics and application of gypsum …
The mining method for the vein was shallow hole room and pillar mining, with a room width of 15 m, room height of 4.0 m, and pillar width of 5 m. ... Reinforcing with FRP can enhance the post-peak strength of the stress–strain curve in the gypsum mining pillar, increase the overall load-bearing capacity, and prevent sudden fracture and ...
Research on Catastrophic Pillar Instability in Room and Pillar Gypsum …
Gypsum is mostly mined through room and pillar mining, where the pillar is usually strip-shaped. The key to this mining method lies in the stability of the pillar. To some degree, the pillar stability decides the safety and sustainability of this mining method. As the mining activities advance, the stress inside the pillar begins changing.
Comparison of laboratory and field electrical
Particularly, in the study by Guinea et al. [9], a strong dependence of gypsum electrical resistivity on mineralogical composition and on the presence and the percentage of lutites (which included, in the specific case, carbonates, quartz and other minor accompanying minerals) was evidenced.This dependence was investigated through …
Research on Secondary Resource Utilization and Mining Damage …
Room-and-pillar mining method plays a dominant role in gypsum mines, which owns a low resource recovery ratio and has left many gobs leading a series of safety production problems to mining enterprises. To get an utmost resource recovery and avoid gob collapse, a secondary utilization scheme has been made by feasibility analysis and …
AP-42, CH 11.16: Gypsum Manufacturing
11.16.1 Process Description1-2. Gypsum is calcium sulfate dihydrate (CaSO4 2H2O), a white or gray naturally occurring mineral. Raw gypsum ore is processed into a variety of products such as a portland cement additive, soil conditioner, industrial and building plasters, and gypsum wallboard.
Mapping a hazardous abandoned gypsum mine using self …
@article{Khalil2022MappingAH, title={Mapping a hazardous abandoned gypsum mine using self-potential, electrical resistivity tomography, and Frequency Domain Electromagnetic methods}, author={Mohamed A. Khalil and Mohammadhossein Sadeghiamirshahidi and R. M. Joeckel and Fernando A. Monteiro Santos and A. Riahi}, …
Gypsum Mining Method & Cost
Also, recovery of approximately 98 percent of the gypsum, as compared with only 40 to 45 percent by underground methods, was another factor in favor of stripping and quarrying methods. Although lower operating costs and higher recovery were primary factors governing the change to surface mining methods, another contributing factor was the …
Gypsum
Plaster or gypsum is a solid material made of calcium sulfate dehydrate. Its name is Anhydrous calcium sulfate CaSO4.2H2O, which falls under this name: 97.1% calcium sulfate. 2.9% water. Impurities such as calcium carbonate (CaCO3) and silica or sand (SiO2). gypsum deposits are spread in large quantities in the rocks belonging to …
Gypsum mining | GeoKansas
Gypsum is a common mineral in Kansas. It is found in thick beds amid layers of sedimentary rocks, such as limestone, shale, and sandstone. Of the three varieties of gypsum—selenite, satin spar, and rock gypsum—Permian-age rock gypsum is mined in Barber County in south-central Kansas and in Marshall County in northeastern Kansas. …
Technological solutions for mining of off-balance …
Abstract. Mining technological solutions for underground mining of off-balance gypsum reserves in difficult mining and geological conditions were justified. An analysis of typical …
Effect of mixing methods on the dispersion of fibers in the gypsum …
1. Introduction. Gypsum, cement, and lime are traditional cementitious materials. Calcined gypsum (β-hemihydrate gypsum, β-CaSO 4 · 0.5H 2 O) is an air-hardening cementitious material that is formed by the dehydration of dihydrate gypsum (including natural dihydrate gypsum and chemical gypsum) at a temperature of …
Gypsum Mining Production Processing and Marketing
Current production of gypsum in the country ranges between 0.5 to 0.6 million tons per annum. Mining of gypsum is being done by the private sector. ... This is, doubtless, an alarming situation. One of the methods to effectively utilize available canal water is to control seepage loss and enhance delivery system. This has been and is being done ...
Room and Pillar Method
The mining method can apply to drift, slope, or vertical shaft mines. In room-and-pillar mining, coal seams are mined by developing a network of "rooms" in the coal seam. ... It was profusely mined during the first half of the 20th century. Gypsum mining ended in 1960, when pits, exploitation rooms and extraction galleries were abandoned.
Mapping a hazardous abandoned gypsum mine using self …
This paper is an integrated geophysical investigation of an abandoned gypsum mine. • We used resistivity and electromagnetic methods to discover an abandoned gypsum mine. • The presence of shallow mine tunnels onsite is the major factor in ground collapse. • The Self-Potential created by downward seepage is a key to …
Gypsum Statistics and Information | U.S. Geological …
Mineral Industry Surveys. Gypsum. PDF Format: 2023: | First Quarter | Second Quarter | Third Quarter | Fourth Quarter |. 2022: | Fourth Quarter |. XLSX Format: 2023: | First …
Pink Gypsum
Our Pink Gypsum is proven to deliver the best results in all related industries. Our team is dedicated to provide the highest quality gypsum for all of our customers. We sell in bulk or bagged. Pink Gypsum from our mine is 90% (+/-5%) pure, the highest in the industry. Pink Gypsum helps soil structure and replenishes vital nutrients.
Gypsum Mining | Processing Equipment | Flow Chart …
Gypsum Mining. IMAR 7 th Edition. Most of the world's gypsum is produced by surface-mining operations. In the United States, gypsum is mined in about 19 states. The …
Study on damage characteristics and application of gypsum …
pillar method, taking a specific gypsum mine as . the research background. The maximum displace-ment reduced by 33%, the maximum vertical stress . decreased by 3.2%, and the volume of the plastic ...
A Stability Analysis of an Abandoned Gypsum Mine Based …
An abandoned gypsum mine has been discovered beneath the route of a highway construction in Hunan province, south China. Due to the highway construction and operations safety, there is an urgent need for a comprehensive stability analysis of the abandoned mining area. The 3D laser scanning detection technique has been adopted, …
Sustainability of gypsum products as a construction material
For underground gypsum mining, because of horizontal laying of the mineral, a room and pillar mining method is used. Primary mechanical operations include drilling, blasting, excavating, primary crushing and screening ( Bushi and Meil, 2011 ).
Nomination Background: Synthetic and Naturally Mined …
gypsum was 18.0 million tons. Synthetic gypsum is mainly produced as a byproduct in flue gas desulfurization (FGD) systems. Calcined gypsum is produced domestically from crude gypsum by heating selenite. In the United States, gypsum is primarily used to manufacture wallboard and plaster for homes, offices, and commercial buildings.
Sustainability of gypsum products as a construction …
A sustainable life cycle includes the energy efficiency of different manufacturing technologies for gypsum products, the use of industrial wastes …
Recycling of pyrite and gypsum mining residues through …
A negative aspect of this method is the releases of CO 2 and generation of subsidiarily wastes, such as gypsum, that usually remain in landfills (Matlock et al., 2002). Neutralization of initial tailings with 1.8 wt.% pyrite content requires 30 kg CaCO 3 /t according to Acid Generation Potential (AP) calculations ( Elghali et al., 2018 ...
Failure pattern of large-scale goaf collapse and a …
Large-area goafs in a gypsum mine tend to collapse after 10 or more years, but the influencing factors are still unclear, and the effects of multiple factors have not been comprehensively considered.
Experimental Investigation of the Mechanical Behavior and …
The mining of gypsum mines is mostly carried out using the open field method, so a large number of goaves are inevitably formed after mining is completed. With the gradual increase in the exposed area and the influence of surrounding loads, accidents such as pillar deformation and roof collapse are prone to occur in the goaf [ 1, 2, 3 ].
Optimization of clay material mixture ratio and filling …
Based on the actual situation in Shaodong Gypsum Mine, the buildings constructed on the goaf need to be protected, and there is neither waste rock nor mill tailings in the mining process. ... The experimental methods are as follows: based on the optimal ingredient ratio (the ratio of water glass, cement, gypsum and clay is …
Experimental investigation into the effects of composition …
For the mining of underground gypsum, room and pillar mining method is commonly adopted to obtain by "retaining pillars and mining room" to treat goaf 1,2,3,4,5,6. After ore extraction ...
