Modern business geography

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Monograph

Identifikator:: 1830562916

URN:: urn:nbn:de:zbw-retromon-217337

Document type:: Monograph

Author:: Huntington, Ellsworth http://d-nb.info/gnd/117070092; Cushing, Sumner W.

Title:: Modern business geography

Place of publication:: New York [usw.]

Publisher:: World Book Company

Year of publication:: 1930

Scope:: VIII, 352 S.; Ill., graph. Darst.

Digitisation:: 2022

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

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Document type:: Monograph

Structure type:: Chapter

Title:: Part one. The field of primary production

Collection:: Economics Books

The Mining Industry 3 VALUE oF CHIEF MINE AND QUARRY PRODUCTS IN THE UNIT (AVERAGE OF 1926 anp 1927) L STATES NETALS Iron (pig iron) . . Copper Lead . Zinc . Gold . Silver . Coal: Bituminous Anthracite Petroleum Natural gas Cement Stone Sand B 698,000,200 232,000,000 96,000,000 83,000,000 47,000,000 37.000.000 FUELS ,106,000,000 “18.000.000 1,554,000,000 1.310,000,000 309,000,000 281,000,000 193,000,000 .12.000.000 Stony ProbucTs What a typical mine is like. In mining for metals and also for coal, vertical shafts are usually sunk. In some mines they extend a mile below the surface; practically always great elevators are needed to carry the workmen and the cars containing the ores up and down. From the shaft, nearly horizontal tunnels or gal- leries are dug at various levels to follow the veins that contain the mineral. In the great mines there are many shafts, and the gal- leries form a complicated network. Occasionally rooms or chambers are formed where large masses of ore have been mined. In galleries and chambers the roofs must be supported by strong beams to pre- vent the overlying rock from falling. The galleries contain railway tracks for the speedy transportation of both the ore and the miners. Often electricity is used in lighting the galleries, in hauling the trains of cars, and in driving the drills. In many mines mules do the hauling; they thrive in their strange homes so long as they are well cared for, and many of them spend their lives under the ground. Most mines must be drained and ventilated. Water is contin- ually seeping out of the surrounding rock, and it would soon flood the mine if powerful pumps were not employed. The presence of large numbers of men and perhaps animals causes the air in the mine to become foul, and the smoke from the lamps in the miners’ caps and the gases that are given off by the explosions when the rock is blasted make it still worse. The air, especially in coal mines, may also be contaminated by gases that come from the rocks themselves.

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