Economic metallic deposits have usually strong seismic contrast 1, 2, product of velocity and density, with their host rocks.Therefore, at the presence of favourable geometry, size and signal-to ...
Forty-six mining-induced seismic events with moment magnitude between −1.2 and 2.1 that possibly caused damage were studied. The events occurred between 2008 and 2013 at mining level 850–1350 ...
To fulfill the objective six iron ore mines were selected from the Goa Group of Dharwar Super Group of the Archaean-Proterozoic ageas shown in Fig.1, where laterite was removed by ripper dozers.
The introduction of modern digital seismic systems to mines and progress in the theory and methods of quantitative seismology have enabled the implementation of realtime seismic monitoring as a management tool, quantifying rockmass response to mining and achieving the first tangible results with prediction. ... Seismic Velocity Inversion from ...
Moreover, some mineral physics studies suggest that the seismic velocity jump at the 410-km discontinuity is inconsistent with that associated with the α to β transformation in olivine8,9.
The seismic monitoring objectives should be reviewed annually and recorded in the mine's code of practice. 4 Network design 4.1 Performance criteria The primary output of seismic monitoring in mines is the time and location of seismic events. No other objective can be met if the seismic network fails to produce this.
Vedanta's Sesa Goa Becomes the First Iron Ore Mining Company in India to Install a Slope Stability Radar for Enhanced Mine Safety. Bengaluru, 10th Feb 2022: Vedanta …
The purpose of this paper is to discuss field and interpretive techniques which permit, in favorable cases, the quite accurate determination of seismic interval velocities prior to drilling. A simple but accurate formula is developed for the quick calculation of interval velocities from "average velocities" determined by the known technique. To secure …
Estimating the goafs ahead of iron mine in advance is essential to ensure the safety of mining. Xishimen Iron Mine is located at Hebei Province, China, which faces high risk of collapse due to the …
Accurate absolute locations are challenging in mine environments with rapid changes in seismic velocity due to sharp contrasts between individual layers and large time-dependent velocity gradients attending excavations. ... Tests were conducted in a coal mine at a depth of 500 m (1700 ft) and signals were recorded on the surface with a 72 …
Seismic Seismic energy Meters, milliseconds Velocity of P or S Structures or velocity All refraction: B,G travel time waves layer contrasts ... Magnetic exploration may directly detect some iron ore deposits (magnetite or banded iron formation), and ... tailings and extent of acid mine drainage around mineral deposits (Dave and others, 1986).
Semantic Scholar extracted view of "Stress-Release Seismic Source for Seismic Velocity Measurement in Mines" by P. Swanson et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 219,736,448 papers from all fields of science. Search ...
Final migration velocity model after incorporation of the near-surface velocity model and the update from CIG analysis. At the top of the mineralization (black line) a constant velocity of 5600 m ...
The structure and dynamics of the upper mantle control tectonics, seismicity, magmatism, and the development of mineral deposits. Seismic tomography maps spatial variations in seismic velocity and offers essential information on the variations of temperature in the mantle, the thickness and mechanical strength of the lithosphere, and …
Abstract. Many metallic mineral deposits have sufficient physical property contrasts, particularly density, to be detectable using seismic methods. These deposits are sometimes significant for our society and economic growth and can help to accelerate the energy transition towards decarbonization. However, their exploration at depth requires …
The weighted average crustal thickness based on these values is 41.1 km. This value is 10% to 20% greater than previous estimates which underrepresented shields, platforms, and orogens. The average compressional wave velocity of the crust is 6.45 km/s, and the average velocity of the uppermost mantle (Pn velocity) is 8.09 km/s.
Routine seismic monitoring in mines was introduced over 30 years ago with two main objectives in mind: • immediate location of larger seIsmIC events to guide rescue operations; • prediction of ...
1. Introduction (Mg 1-x Fe x)O ferropericlase is the second most abundant mineral in a pyrolitic lower mantle, constituting approximately 18% by volume (Irifune et al., 2010).Under pressures relevant to the lower mantle, the iron atoms in ferropericlase gradually undergo a spin-pairing transition from high-spin (HS) to low-spin (LS) state, …
where (K) is the bulk modulus, (mu) is the shear modulus and (rho) is the density.. S-waves. S-waves are shear waves in which the particle motion is perpendicular to the direction of wave propagation. The shearing action and the propagation of the wave can be seen in the diagram on the right 1.Cells change shape but do not change volume when …
The proposed method includes rock parameters such as uniaxial compressive strength, seismic P-wave velocity, discontinuity spacing and Schmidt hammer hardness value.
Field photos from the 3D seismic survey (April-May 2019) in the Blötberget mine. The survey was conducted using the 32t vibrator of TU Bergakademie Freiberg, 1266 receivers of which 414 were ...
Superionic iron alloys and their seismic velocities in Earth's inner core Y He 1,2,4, S Sun 1,3,4, D Young Kim 2, B Gyu Jang 2, Heping L 1 & H-ang Mao 2
A better understanding of geological structures, stress regimes, and rock burst risks around longwall mining panels can allow for higher extraction efficiency with reduced safety concerns. In this paper, the stress change of rock mass was first examined by using ultrasonic technique into laboratory-scale rock samples. Subsequently, the active and …
The total amount of convergence between India and Asia has been estimated to range from 2000 to 3000 km, increasing eastwards, using the surface of the indentation mark, left by the impaction of India onto Asia (Tapponnier et al., 1986, Le Pichon et al., 1992, Guillot et al., 2003).The estimated partitioning of shortening between India and …
The seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa C. Wright a,), ... Analysis of the refracted arrivals on a seismic reflection profile recorded along the wall of a tunnel at an iron mine near Thabazimbi, South Africa, shows variations in P-wave velocity in dolomite away from the de-stressed zone ...
Earthquake magnitude recurrence relations are developed for the State of Goa on the west coast of Peninsular India. The Seismic influence zone for the study area of Goa was considered as 350 km...
Since the initial collision at 55 Ma, rocks of the Indian crust below the Himalayas have undergone modification chemically and compositionally due to the ongoing India–Asia convergence. The local earthquake tomography images a shallow (~ 1–2°) north-easterly dipping low-velocity layer (10–20% drop in Vp and Vs, 10–15% increase …
For the prevention and control of rockburst in underground coal mines, a detailed assessment of a rockburst hazard area is crucial. in this study, the dependence between stress and elastic wave velocity of axially-loaded coal and rock samples was tested in a laboratory. The results show that P-wave velocity in coal and rock is …
The past seismic history of worked out mines in India shows some large visible ground subsidence events and recent sinkhole formations in the densely populated areas close to the mining area, causing serious social, economic and political concerns to the residents as well as district administration and state government. ... 2002 7 Modified ...