Sentence examples for shaft mining from inspiring English sources
Hard-rock mining had begun in the 1880s, but shaft mining commenced when vast deposits of copper were discovered there.
The heyday of the shaft mining that made Mineral famous ended in the 1920s, Mr. Keller said, when strip mining in Louisiana began to provide a cheaper, faster supply of the same minerals.
The market is betting that Palabora can't efficiently convert from strip to shaft mining to get at its remaining reserves.
Stone Shaft Mining is optional, but not a necessity, and resources can be better spent on your military.
Research all the important stuff like Crop Rotation, Two-Man Stone/Gold/Gold Shaft Mining, and other stuff that are important.
By 1905, several small slope mines and 15 shaft mines operated in the county.
The ores occur at depth in a synclinal structure so that deep-shaft mining is normal, although there has been some opencut mining.
Until the late 20th century, Bolivian tin and silver were extracted mostly by large shaft-mining operations, often performed in difficult, remote sections of the eastern cordilleras and at high elevations.
The federal attorney general's office, which promised to open an investigation, said the explosion in the primitive, vertical-shaft mine was caused by a gas buildup.
Many old shaft (underground) mines have closed, and open-pit mines have opened in the Hunter valley and at Ulan.
