Most potash mines today are deep shaft mines as much as 4, 400 feet ( 1, 400 m ) underground.
22.
Sungai Lembing in the heyday was a large centre for shaft mining of " timah " better known as tin.
23.
At the time of completion of the third shaft, the Maurits mine was the largest two-shafts mine in the world.
24.
Improvements in stamping efficiency and cost increases in traditional shaft mining made these sand tailings economically feasible to reclaim and re-stamp.
25.
One of the four and 12 miners sent in to help were killed by a second, larger explosion in the deep-shaft mine.
26.
The company also operated the Pyne Mine, a vertical shaft mine, one of the most productive ore mines in the Birmingham District.
27.
Drift mines, as they require no machinery for pumping water and raising coal, cost less than half the amount required in shaft mining.
28.
Since regional coal mines were constructed with horizontal shafts, they were far less dangerous than the vertical shaft mines of Pennsylvania and West Virginia.
29.
Standard Shaft, sometimes just called " Shaft " by the locals, refers to the community that had in roots in the Standard Shaft Mine operation.
30.
These families might have been as deep in debt as they were into the slope and shaft mines, but they were a proud, hard-working lot.
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