The city's economy developed from drift mining for coal in the late 19th century and agriculture in the early 20th century.
32.
The first drift mine workings occurred in the late 1800s, at a site referred to at the time as the Tirbach Slants.
33.
Coal was mined for local or personal use from drift mines where the coal seam outcropped from Fletcher Bank to Great Hill.
34.
Originally sunk for ventilating Glynhebog drift mine, it was extended to a depth of to meet the workings at Cynheidre, providing an upcast.
35.
Drift mines, as they require no machinery for pumping water and raising coal, cost less than half the amount required in shaft mining.
36.
A seldom-photographed railway emerged from the fireclay drift mine then ran parallel to the Lowca Light railway along the clifftop to Micklam brickworks.
37.
This drift mining enabled Daw Mill to increase its production capacity as it removed the often time-consuming process of winding coal up the shafts.
38.
At the height of coal production, there were over 160 drift mines and over 30 shafts working the nine seams in the Blaenavon locality.
39.
The Ament Dam, built in 1902 by the Golden Drift Mining Company to provide water for mining equipment, was slightly upriver of Grants Pass.
40.
Since then the area has seen some small private mines come and go, such as a drift mine on Grenig Road in the 1970s.
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