Crandall Canyon Mine

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The Crandall Canyon Mine, formerly Genwal Mine, was an underground bituminous coal mine in northwestern Emery County, Utah.

The mine made headline news when six miners were trapped by a collapse in August 2007. Ten days later, three rescue workers were killed by a subsequent collapse.

Contents 1 Location 2 Ownership and operation 3 History 3.1 Safety concerns 4 Mining accidents 4.1 Initial collapse 4.1.1 Disaster response 4.2 Second collapse and suspension of underground rescue efforts 4.2.1 Timeline 5 See also 6 External links 7 References 7.1 Notes

[edit] Location

The Crandall Canyon Mine is located at 39°27′36″N, 111°10′03.5″W (39.460000°, -111.167639°)^[1] with its entrance at an elevation of 7,385 feet (2,251 m). It resides in Emery County, Utah, about 15 miles (24 km) west north-west of Huntington. Located just off State Route 31, the mine is about 34 miles (55 km) southeast of Fairview, and 140 miles (225 km) south of Salt Lake City. The mine is within Crandall Canyon in the Wasatch Plateau Coal Field.^[2] The permit area for the mine covers an area of more than 5,000 acres (20 km²) utilizing fee land, federal, and state leases.^[2] The Manti-La Sal National Forest surrounds the mine. The mine conducts surface operations on 10 acres (40,000 m²) of disturbed land within the forest.^[2]

[edit] Ownership and operation

The mine is co-owned by UtahAmerican Energy, Inc. (formerly Andalex Resources), a company with approximately US$65.1 million in annual sales, headquartered in Sandy, Utah. UtahAmerican is a subsidiary of Cleveland, Ohio based Murray Energy Corporation, owned by Robert E. Murray.^[3][4] The Crandall Canyon mine is operated by Genwal Resources Inc., an operating division of UtahAmerican. The other co-owner is the Intermountain Power Agency (IPA) of South Jordan, Utah.

[edit] History

Mining was conducted at the site from November 1939 to September 1955 using a room and pillar method.^[2] The Genwal Coal Company resumed mining there in 1983.^[2] At that time the mine produced between 100,000 and 230,000 tons (91,000–209,000 t) of coal each year.^[2] NEICO purchased the mine in 1989 and the next year IPA purchased 50% interest.^[2] By 1991, a continuous haulage system was used helping production surge to 1 to 1.5 million tons (900,000–1,400,000 t) each year.

Genwal Resources, Inc. acquired the mine in March 1995 and a longwall was installed the same year into the mine.^[2] The installation of the longwall nearly doubled the capacity of the mine.^[2] A new longwall was purchased two years later which increased the capacity further to 3.5 million tons (3,175,000 t) per year.^[2] To handle the increased capacity, a new loadout facility was built at the mine.^[2] Additional federal leases were expected to extend the life of the mine and new portals on its south side were slated to be installed to expand access options.^[2] Mine owners had informed the state of Utah they planned to close the mine in 2008^[5].

[edit] Safety concerns

In 2006, the mine was cited for several safety violations, including lacking the required number of escape routes.^[6] However, its 64 violations and $12,000 in fines was a relatively good safety record and on par with similar-sized mines throughout the country.^[7][8] Murray said that the safety violations were trivial and included violations such as not having enough toilet paper in the restroom.^[7] In addition, a practice^[9] referred to as retreat mining was being conducted in some portions of the mine in which the coal had been removed by room and pillar method. The extraction of material literally creates a 'room' while the ceiling is supported by the 'pillars' of coal that remain. Retreat mining refers to the common practice of removing the pillars while retreating back towards the mine entrance.

On March 10, 2007 the north barrier pillar suffered from a rock burst, in which pressure causes material from the walls and ceiling to explode inward into the excavated spaces. No miners were injured and all equipment was recovered from the affected area, but the partial collapse closed off that area and forced the mine to instead extract coal that had a higher ash content. The company depended on the low-ash coal to meet its contractual obligations, however, so on March 21 a meeting was held in which it was decided to return to the south barrier pillar. This pillar was adjacent to the north barrier pillar. The March 10 event was never officially reported to MSHA, as required by law. Robert Murray claimed to be unaware of the incident but minutes of the March 21 meeting, released in January 2008, revealed that he had in fact known about it.^[10]

[edit] Mining accidents

[edit] Initial collapse

A mining accident took place on Monday, August 6, 2007, at 2:48 A.M. MDT. The mine collapsed, trapping six workers: Kerry Allred (58), Luis Hernandez (23), Brandon Phillips (24), Carlos Payan (20s), Manuel Sanchez (41), and Don Erickson (50). The workers are believed to be approximately 3.4 miles (5.5 km) from the mine entrance and 1500 feet (457 m) underground. Seismic waves from the "coal mine bump" (collapse) was reported as magnitude 3.9 to 4.0 by seismograph stations in Utah and Nevada. Initial reports questioned whether the collapse was triggered by an earthquake, but overwhelming evidence has led researchers to believe the seismic waves were caused by the collapse.^[11][12] Additional seismic activities were recorded in the days following the event.^{[13][14][15][16]}

[edit] Disaster response

Rescue teams were dispatched immediately to assess the damage to the mine and begin clearing rubble to reach the cavity. The process of clearing the rubble and reinforcing the passageways to the cavity was estimated to last between two to six weeks, but additional seismic activity and safety concerns introduced further delays.^[17]

At 9:47 PM MDT Thursday August 9, 2007, a drill bit boring a 2.5 inch (6.3 cm) hole over 1,800 feet (549 m) into the presumed location of the trapped miners reached its targeted destination.^[18] The hole was fitted with a steel pipe to allow air samples to be recovered and a microphone to be lowered, which reached the cavity location underground early Friday morning on August 10. The microphone recorded no sounds of human activity, but the crude air sample analysis from underground initially determined that the atmosphere was hospitable for life, with a sampling consisting of 20.5% oxygen, some carbon monoxide, and no traces of methane.^[19] The analysis did not, however, reveal the presence of carbon dioxide, which would be expected if the miners were still alive and breathing. Subsequent air samples, though, showed oxygen levels near 7%, at near fatal levels for human life.^[20] Initially, the subsequent sampling was thought to be consistent with a neighboring sealed-off mine cavity, and that the drill bit simply drifted off course, but it was later confirmed that it actually did reach its targeted destination. Seemingly, the initial findings of 20.5% oxygen levels were from the bore hole itself, instead of the actual mine cavity.^[21]

A concurrent rescue effort involved the creation of a nine-inch (22 cm) hole. The target was another possible location of the miners at the time of the collapse. This shaft would allow the delivery of food, water, and a powerful camera to scope the site. This shaft reached the mine shaft early Saturday, August 11.^[22] The aforementioned video camera was lowered into the collapsed coal mine from the nine-inch (229 mm) wide shaft, and revealed typical mining equipment but not the six missing miners, according to a federal official speaking on Sunday, August 12, 2007.

Poor lighting allowed the camera only to see about 15 feet (4.6 m) into a void at the bottom of the drill hole, far less than the 100 feet (30.5 m) it is normally capable of seeing, said Richard Stickler, Chief of the Mine Safety and Health Administration (MSHA).

A third bore hole was started on the evening of Sunday, August 12. The target is a ventilation area near the back of the mine. Miners are trained to go to these areas in the event that other escape routes are inaccessible. The bore hole was completed mid-day on Wednesday, August 15th.^[23] Initial equipment was unable to fit through a bend in the bore hole.

Shortly before 7:00 pm MDT on August 15, 2007, vibrations were reported to have been detected within the mine.^[24] These vibrations, heard by geophones lowered into the borehole, had a duration of around five minutes, but could easily have been an animal or even a rock crumbling, said Stickler. This sound activity caused a major rethinking in the proposed location of the fourth hole that was under consideration.^[25] This fourth hole has been planned to target these noises detected in the mine about 3/4 of the distance to the third hole, roughly 800 feet (250 m) beyond the initial holes.^[26] The first two bore holes targeted the approximate location of the miners at the time of the collapse. The third bore hole targeted a ventilation area about 1200 ft (365 m) beyond the first two holes.

On mid-day August 16, 2007, eleven days after the collapse, underground rescue teams were less than halfway through the rubble to the suspected location of the miners. Continued bursting of tunnel walls damaged digging equipment and required additional structural reinforcement for the safety of the crew. In the 24 hours between the August 15th and 16th reports, digging teams were only able to advance about 25 feet (7.5 m). They had advanced 826 feet (251.7 m) into the rubble and estimated 1200 feet (365 m) still remained.^[27]

[edit] Second collapse and suspension of underground rescue efforts

Later on August 16, 2007 at about 6:30pm MDT, the mine collapsed again when one of the walls of the tunnel exploded outwards, killing three rescue workers and injuring six others.^[28][29] All rescue workers were pulled from the mine, and it was not known whether rescue efforts underground for the trapped miners would continue.^[28] One of the killed workers was an inspector for the federal Mine Safety and Health Administration (MSHA). Governor of Utah Jon Huntsman, Jr. flew to the hospital and said that he hoped underground rescue efforts would stop, but that that was up to MSHA.^{[citation needed]}

A week later, Blake Hannah, a retired inspector who used to oversee the mine said that several warning signs — including reports from miners of weakening support structures — had been ignored. "In my opinion," he said, "there were bad mining practices."^[30]

Bob Murray, owner of the mine, stated that he has already filed paperwork with federal regulators to permanently close and seal the Crandall Canyon mine. "Had I known that this evil mountain, this alive mountain, would do what it did, I would never have sent the miners in here. I'll never go near that mountain again," he said.^[31]

On August 23, 2007, rescue workers bored a sixth hole into the area where the miners were last known to be working.^[32] As of August 26, 2007, rescue workers have detected no signs of life from the sixth borehole. "There was zero void. [And they] are going through a living hell, and it's just heartbreaking" quoted Colin King of Rob Moore, vice president of Murray Energy, as he informed the families Saturday. Although the sixth hole had been called the final hole,^[33] a seventh hole was drilled on August 30, 2007. The mine cavity was filled with mud and debris, rising about 5 ft (1.5 m) per hour (1.5 m/h).^[34]

[edit] Timeline

• On Thursday, August 16, 2007:
  • At 8:55pm MDT: CNN reported that at least six ambulances were dispatched to the mine following a "significant seismic event" or "bump". A seismic event was registered at 6:38 in that area.^[35] in which several rescuers were injured, according to a representative from the Utah Department of Natural Resources.^[36] Two helicopters were also dispatched from University of Utah Hospital in Salt Lake City. Deseret Morning News further reported that the same official, Tammy Kikuchi, stated that five people were injured, two critically.^[37]
  • At 9:22pm MDT: AP (via MSNBC) and KSL Newsradio were reporting nine injured and with two of those critical.^[38]
  • At 9:57pm MDT: KSTU confirmed reports of one fatality among the rescuers following a "bump" at about 6:30pm (KSTU also reported a 1.6 magnitude seismic shock occurring) (recorded by the University of Utah also at around 6:30pm).
  • At 10:57pm MDT: CNN & AP reported that a second rescue worker had died.
  • At 11:40pm MDT: CNN reported that a third rescue worker had died.

• On Friday, August 17, 2007:
  • At 1:50am MDT: CNN reported that one injured rescue worker had been released from the hospital.
  • At 4:56am MDT: MSNBC & CNN confirmed the three previously speculated deaths.
  • At 11:00am MDT: There was another press conference discussing the latest developments.

• On August 17, 2007, Rich Kuczewski of the United States Department of Labor announced that there would be an indefinite suspension of the underground rescue effort, stemming from the three fatalities and nine injuries from the most recent collapse of the mine. Utah governor Jon Huntsman Jr. was one individual behind the push for federal aid to stop the rescue effort immediately.

• On August 18, 2007, the fourth bore hole was completed.^[39] Cameras showed the area was completely collapsed, and air samples taken would not support human life. Rob Moore told reporters, "It is disappointing. And it's likely that these miners may not be found." A fifth bore hole was started on August 20. If the miners are found alive, rescuers have discussed boring a large diameter hole to extract them through. Monitoring equipment in the first bore holes still have not detected any signs of life. Both the monitoring equipment and continued seismic activity indicate the mine is slowly collapsing and remains unsafe for underground rescue workers.^[40][41]

• On August 22, 2007, a fifth bore hole reached the mine tunnel. Video that came back from a camera lowered into the bore hole showed only about 6 inches of open space between the ceiling and rubble filling the 8-foot-high tunnel.

• On August 25, 2007, a sixth bore hole reached the mine tunnel. Officials announced that the section of the mine was too small for the miners to have survived. A robotic camera -- which was ordered weeks before and was finally assembled over the previous week -- was planned to descend the hole on August 27. A seventh bore hole was also planned. ^[42]

• On August 26, 2007, owner Bob Murray announced the closure of the Tower mine, which contains the area of the collapse. Murray announced that he would relocate workers to Illinois or Ohio if they choose, saying, "If they choose this, there will be no one laid off." Some workers complain that he is not offering enough benefits for relocated workers, and that a cost of living adjustment to local pay scales reduces their salary too much.^[43]

• On August 28, 2007, the robotic camera was unable to reach the mine through the sixth bore hole. The continuing seismic activity caused the bore hole to shift. The machine was able to descend within about 10 feet (3 m) of the mine cavity. It will be sent down the seventh bore hole. ^[44]

• On August 30, 2007, the seventh bore hole was completed. The mine cavity was filled with mud and debris, rising about 5 ft (1.5 m) per hour (1.5 m/h).^[34] Mine owners announced that there were no plans to drill additional holes, which cost about $600,000 each.^[45] They also announced plans to send the robotic camera down the fourth bore hole.

• On August 31, 2007, the robotic camera was sent down the fourth bore hole. Federal Mine Safety and Health Administration spokesman Rich Kulczewski says officials planned to drop the robot down the fourth hole despite his guess of a 90 percent chance the high-tech camera could be lost.^[46]

• On September 1, 2007, Federal officials called off the search after four weeks of failed search efforts. The option of drilling an eighth hole was not ruled out entirely but would only be considered if new information arose to justify its drilling. ^[47]

• On November 21, 2007, Federal regulators revealed that Murray Energy sealed three main passageways with concrete blocks last month, leaving the bodies inside entombed. The blocks may removed at a later date in the unlikely event there are any subsequent recovery efforts.^[48]

• On June 1, 2008, a 53-page report issued by University of Utah seismologists was released to the public. It recalculated the epicenter of the magnitude-3.9 mine collapse began near where miners were excavating coal and quickly grew to a 50-acre cave-in. They also estimated the size of the collapse to be about four times larger than was thought shortly after the time of the Aug. 6, 2007, disaster. ^[49]

[edit] See also

• Wilberg Mine
• Sago Mine
• List of mining disasters

[edit] External links

• Crandall Canyon Mine - MSHA.gov MiniSite. Contains vector-image maps of the affected area of the mine and drill hole map, and also the emergency response plan.
• Crandall Canyon Mine is at coordinates 39°27′36″N 111°10′04″W / 39.460000, -111.167639 (Crandall Canyon Mine)Coordinates: 39°27′36″N 111°10′04″W / 39.460000, -111.167639 (Crandall Canyon Mine)
• Utah Geological Survey 2005 Coal Report (Crandall Mine described on pp 7-8)
• Seismological Report on the 6 Aug 2007 Crandall Canyon Mine Collapse in Utah

[edit] References

[edit] Notes