Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Retreat mining"'
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 1, Pp 127-135 (2021)
The National Institute for Occupational Safety and Health (NIOSH) conducted a comprehensive monitoring program in a room-and-pillar mine located in Southern Virginia. The deformation and the stress change in an instrumented pillar were monitored duri
Externí odkaz:
https://doaj.org/article/73b492f94f5d48148ce2aa0142107b61
Autor:
Hani S. Mitri, Tuo Chen
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 5, Pp 975-982 (2021)
Steeply dipping, vein and tabular orebodies are traditionally extracted with longitudinal retreat mining methods such as Eureka and Avoca in a bottom-up sequence with delayed backfill. To increase productivity, sill pillars in the orebody are used to
Publikováno v:
Rock Mechanics and Rock Engineering. 54:3447-3468
Mining-induced stresses in underground coal mines play a significant role in pillar and ground support design, hence in the safety of mining operations. In the US, Analysis of Longwall Pillar Stability (ALPS) and in Australia, Analysis of Longwall Ta
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 1, Pp 127-135 (2021)
The National Institute for Occupational Safety and Health (NIOSH) conducted a comprehensive monitoring program in a room-and-pillar mine located in Southern Virginia. The deformation and the stress change in an instrumented pillar were monitored duri
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 1, Pp 117-126 (2021)
Many states rely upon the Pennsylvania 1957 Gas Well Pillar Study to evaluate the coal barrier surrounding gas wells. The study included 77 gas well failure cases that occurred in the Pittsburgh and Freeport coal seams over a 25-year span. At the tim
Autor:
Arun Kumar Singh, Ashok Kumar, Rajendra Singh, Sahendra Ram, Dheeraj Kumar, Amit Kumar Singh, Rakesh Kumar
Publikováno v:
Mining, Metallurgy & Exploration. 37:1451-1459
This article offers an examination of a retreat mining method conducted at the Pinoura Mine in India from 2010 to 2017. The method is atypical for coal mines of India’s coalfields. The method executes depillaring in a single pass and does not requi
Autor:
Myoung Hwan Jang
Publikováno v:
Journal of the Korean Society of Mineral and Energy Resources Engineers. 57:127-136
Publikováno v:
Rock Mechanics and Rock Engineering. 52:4907-4923
In 2001, researchers from the National Institute for Occupational Safety and Health (NIOSH) installed instruments at the Turquoise Ridge Mine in cooperation with Placer Dome, Inc. to monitor the geomechanical behavior and stability of a cemented rock
Publikováno v:
Rock Mechanics and Rock Engineering. 52:3373-3384
The stability of the entries of longwall panels is a major concern in underground coal mines. While panel entries have a short service life, they must be well supported to sustain the mining-induced loads during panel extraction. In this paper, a pan
Publikováno v:
MassMin 2020: Proceedings of the Eighth International Conference & Exhibition on Mass Mining.
Vazante is an underground mine owned by Nexa Resources group that uses VRM (Vertical Retreat Mining) as predominant mining method, which involves leaving ore pillars in the mined stopes. These pillars have the function of stabilizing the open stope a