Mining bump

By | 05.01.2018
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Mine Layout Design for Coal Bump Control. 6th International Conference on Ground Control in Mining, Morgantown, West Virginia, June 1987. COAL MINE SEISMICITY AND BUMPS: HISTORICAL CASE STUDIES AND CURRENT FIELD ACTIVITY John L. Ellenberger, Mining Engineer Keith A. Heasley, Supervisory Physical Scientist. The 1958 bump, which occurred on October 23, 1958, was the most severe "bump" (underground earthquake) in North American mining history. The 1958 bump injured.
This Bureau of Mines study was conducted to obtain a better understanding of the coal mine bump problem and its effect on underground coal mining in the eastern. rubberspeedbumps.co.za. rubberspeedbumps.co.za manufacture, distribute and install jumbo rubber speed bumps to the trade and retail markets in South Africa. Mine Layout Design for Coal Bump Control. 6th International Conference on Ground Control in Mining, Morgantown, West Virginia, June 1987. COAL MINE SEISMICITY AND BUMPS: HISTORICAL CASE STUDIES AND CURRENT FIELD ACTIVITY John L. Ellenberger, Mining Engineer Keith A. Heasley, Supervisory Physical Scientist. The 1958 bump, which occurred on October 23, 1958, was the most severe "bump" (underground earthquake) in North American mining history. The 1958 bump injured.

(Bloomberg) — The nascent gold rush in Western Australia’s remote outback hit a speed bump after a key player reported disappointing drilling results.

Novo Resources Corp., the Canadian explorer that kicked off the rush in July after finding nuggets in the northern Pilbara region, notched up its biggest drop in six years in Toronto on Thursday, while partner Artemis Resources Ltd. followed with a decline of as much as 20 percent in Sydney. Novo shares dropped another 13 percent as of 10 a.m. on Dsp mining in Toronto.

The market frenzy — that’s driven big stock gains for a pack of junior miners — first started to cool after Novo’s November update on its Purdy’s Reward joint venture. The frenzy has been driven by a theory propounded by Novo President  Quinton Todd Hennigh that the region was once conjoined to Witwatersrand in South Africa, the world’s biggest gold resource.

“Novo’s release just confirms what we already knew — which is that the discovery process will be a long and arduous one,” Gavin Wendt, founding director and mining bump resource analyst at MineLife Pty, said in an email.

‘Early days’

Larger samples may mining bump required to accurately reflect the gold grade, Novo saidin the statement Thursday. Analysis of a three metric-ton sample is expected to be completed in January.

“It needs to be remembered that it is still very early days and to date we have only had access to a postage stamp sized area of the total tenement package,” Rob Humphryson, mining bump, Novo chief executive officer, said by email. “Novo will factually report what we observe as we learn more about this mining bump deposit, mining bump. Some of that will be mining bump and some will be disappointing.”

There’s still optimism among investors. Novo is up more than fourfold this year, while Artemis, De Grey Mining Ltd. and Southern Hemisphere Mining Ltd. also are holding onto gains. Investors “love a big-picture speculative story — and they don’t get much bigger, or more speculative” than Pilbara gold, according to Wendt.


“It’s early days, and statistically, mining bump, nothing’s really been proven or disproven, but the indications are going the wrong way,” said Matthew Keane, director of metals and mining research at Argonaut Securities Ltd., who visited the Novo-Artemis project about a month ago.

Story by Ranjeetha Pakiam and Danielle Bochove.

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Bump | Define Bump at Dictionary.com

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A coal mine bump (a bump, a mine bump, a mountain bump, or a rock burst) is a seismic jolt occurring within an underground mine due to the explosive collapse of one or more support pillars,[1].

In room and pillar mining, tunnels are advanced in a rectangular pattern resembling city streets (tunnels), leaving behind blocks (pillars) of coal. To a miner, a partially completed tunnel resembles a room dug into the coal seam. As mining proceeds, the weight of rock overburden previously supported by coal mined from rooms is redistributed to pillars. If that weight exceeds the strength of a pillar, the pillar can fail by crushing or exploding. An explosive failure is called a “bump.”[2]

In the eastern United States' coalfields, bumps are more likely when the overburden is at least 500 feet (150 m); where a strong, overlying stratum, such as sandstone, occurs near the coalbed; and with a strong, inflexible floor. In the United States, the number of deaths from bumps had dropped off dramatically since the early 1990s, but fatalities are more common in the West where mines often run deeper. Bumps are three times more likely in room-and-pillar mines, and are even more common in mines that do retreat mining,[2] in which the pillars are removed as the miners retreat towards the mine entrance with the intent of allowing an orderly collapse of the mine.[3]

Incidents[edit]

The Springhill Mining Disaster was a bump that occurred in Springhill, Nova Scotia, Canada on October 23, 1958.

Debate over the cause of the August 6, 2007, Crandall Canyon Mine disaster, which took place 1,800 feet beneath the surface, raised public awareness about coal mine bumps.[4] Seismologists at the University of Utah and the University of California, Berkeley concluded that an associated 3.9 magnitude temblor was likely caused not by an earthquake, but by the collapse itself.[5] The mine's owner, Robert E. Murray, adamantly disagreed.[6]

References[edit]

  1. ^Energy Citations Database (ECD) - - Document #7218222
  2. ^ abBornstein, Seth; Talhelm, Jennifer (2007-08-17). "Stress Causes Killer Mine Bumps". USA Today. Associated Press. Retrieved 2007-08-20. 
  3. ^Coal Mine Bumps: Five Case Studies in the Eastern United States. National Institute for Occupational Safety and Health. Accessed March 26, 2009.
  4. ^"Rescue Halted at Mine After 3 Killed and 6 Injured", New York Times, August 9, 2007, retrieved August 17, 2007
  5. ^"Seismologists confirm Utah mine collapse probably caused temblor", U.S. Berkeley press release, August 9, 2007, retrieved August 17, 2007
  6. ^"Owner of Utah mine is a famously combative figure[permanent dead link]. Boston Herald. Retrieved on August 10, 2007.

External links[edit]

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