Mr Fyfield was seriously injured in the incident but escaped through an old mine shaft.
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The plans are to turn the old mine into 11, 000 sq m of office and employment space.
Blankenship says the accident "could have happened to anyone" and partly blames faulty maps of the old mine.
However, the shop closed in April 1998 when the building began to collapse because of old mine workings.
"Even though it was an old mine, it had been modernised, " he added.
BBC: NEWS | UK | Wales | South East Wales | Fatal mine explosion remembered
Mrs McCourt and her family have spent years looking for her body in a hunt which has included draining ponds and exploring old mine shafts.
The work, which will involve drilling and grouting old mine workings and strengthening slopes and the river banks, will take four years, the council said.
Mine rescue teams confirmed that the four miners at Gleision Colliery were trapped by water after they broke into an area of old mine workings.
After it finishes extracting what it believes is the small bit of gold still left in the old mine, it plans to turn the land into a park.
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The Mines Rescue Team leader Andrew Watson said no contact has yet been made with the miners, who were trapped by water after they broke into an area of old mine workings.
People living near an old tungsten mine on the edge of Dartmoor have said plans to reopen it have disrupted their lives.
This devastation dates from 1974, when Mitsubishi shut down an 84-year-old coal mine on the wind-blown, storm-swept island of Hashima, 12 miles (19 kilometers) southwest of town.
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Another episode involved a small European bank, which had hired an internal recruitment specialist and an old acquaintance of mine.
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McCANN: I asked an old friend of mine who was a Marine Raider in World War II, and following that, a career CIA officer throughout the Cold War.
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Elsewhere, an extra pump has been brought in to help stop water from the old Wheal Jane tin mine overflowing.
Theories to explain the disaster include the explosion of a faulty torpedo in the bow and a collision with another submarine or old anti-shipping mine.
"I've even had the club physiotherapist call me because he used the old number which is now mine, " she said.
Mr. Barakzai and a young teacher named Ahmad followed a ten-year-old miner deep into the mine to film the video.
Toronto's Northland Power wants to convert an old open-pit iron ore mine in Ontario into a waterfall five times the height of Niagara Falls, which could be used to generate power.
Mr. LEWIS: Maybe it's because I started studying piano at four years old and maybe it's because it became a very deep love of mine by the time I was 11, 12 years old.
In another case, a friend of mine decided to donate an old family heirloom, one document showing the contribution of her ancestor in the military.
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The center lies on the edge of an old, roughly one mile-wide gold mine, first opened in 1910, and now owned by Goldcorp Inc.
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"I'm still fine since I bought my stocks at a slightly cheaper price, but I'll have to think about withdrawing if they go below their initial prices, " said Tatsuyuki Mine, a 36-year-old employee at a real-estate firm who has tens of thousands of dollars invested in Japanese stocks.
The 67-year-old Morris said he's worked for the coal mine for 28 years.
Some of her features are artistically highlighted with stone from the mine that is often used for the restoration of old buildings.
We arrived at another of the camps - no more than a few old sacks and tarpaulins spread out along the road opposite the mine entrance - and were immediately surrounded by farmers, who until a year ago, they said, would never have dared to speak to a foreigner about their problems.
Albert's 80-year-old grandson Noel Snailham, himself now a retired miner and former mine rescue team member, recalled the mixed emotions his mother felt at this act of selflessness.
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