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Seven men, including a father and son, were in the drift mine when the accident occurred.
With such a large amount of coal near the surface several drift mines were also in production.
There were other small drift mines on the fell.
The coal was drawn from drift mines in the sides of the valley.
The remains of an old forge and drift mines exist in the valley.
On the way out, she paused to destroy a drifting mine with gunfire.
My best guess is it's a drifting mine, which we've encountered in these waters before."
Workers at Wales' largest drift mine face a further wait to learn how many jobs will be lost in cutbacks.
Between air attacks and drifting mines, the work of the escorts was brisk.
It can be used against floating or drifting mines, which Iran has used in the past.
There was a serious risk from drifting mines.
She was tasked with patrolling for drifting mines off the coast.
She also exploded several drifting mines during this patrol.
Both of these were very close to the surface and could extracted using drift mines or bell pits.
Three other miners managed to escape as the flood engulfed the drift mine.
A drift mine is one that miners can walk into rather than require a lift down to the coalface.
As well as drift mines, small scale shaft mining was used.
In 1868, Brown and Godfrey opened a drift mine four miles northwest of town.
There are plans to open a new, community-owned drift mine less than 10 miles from the Caphouse museum.
In slope and drift mines, the stables were usually on the surface near the mine entrance.
It is assumed, for lack of other explanation, that she struck a chance drifting mine which was moving down the coast on the tide.
During this period, she sank seven drifting mines.
At this time, coal was being extracted from shallow drift mines in the vicinity of the river.
The union leader representing workers at Wales' largest drift mine has advised some to seek jobs elsewhere.
There was some mining in the 17th century when a drift mine was being worked at Milkwall.