A text-book of ore and stone mining by Foster Clement Le Neve Sir 1841-1904

Author:Foster, Clement Le Neve, Sir, 1841-1904
Language: eng
Format: epub
Tags: Mining engineering
Publisher: London, C. Griffin & company, limited; Philadelphia, J.B. Lippincott company
Published: 1894-03-25T05:00:00+00:00

yard (yS26 kil. per metre). The last section, however, has harder work, and the chain is of i-inch iron (26 mm.) and weighs 28 Ibs. per yard (14 kil. per metre). Each waggon holds iyf cwt. (900 kil.) of ore, and when the waggons are arranged 2 7 yards (25^2 m.) apart, the chain haulage is capable of transporting 2500 to 2600 tons of ore a day, in addition to a certain amount of rubbish which is tipped before arriving at the port.

6. Conveyance of Mineral by Boats from one part of a mine to another is exceptional ; but transport by canal or sea to the consumer is common, and is chosen whenever available on account of its comparative cheapness. It is of the utmost importance when dealing with large quantities of mineral to have cheap and rapid methods of shipping it. At Huelva, the shipping-port of the Rio Tinto mines, the trains of ore are drawn on to a part of the pier which has just enough inclination to make a truck run down of itself. A workman then uncouples a truck and allows it to run opposite a shoot, which leads to the hold of the vessel lying alongside the pier. The truck is emptied by opening the bottom and letting the contents drop into the mouth of the shoot. The bottom is then closed and the truck is allowed to run on a little further, when it is shunted back on to a side line, and made to join the train of empties ready to be drawn back to the mine. After the locomotive has once hauled a train on to the proper part of the pier, the discharge of its contents into the ship proceeds very rapidly and requires the attendance of only one man.

The arrangements are so perfect that 500 tons can easily be loaded in an hour, but naturally a good deal of time is lost in shifting the steamers and berthing them. The greatest amount of work in loading at Huelva pier has been a little over 3000 tons in a single day. A steamer has been known to come into Huelva harbour by one tide, and leave by the next with a cargo of 1500 tons of ore.

The Somorrostro Company loads its iron ore at Bilbao in a similar manner. The Company has three wharves, at each of which 2000 tons can be shipped in a day ; indeed a ship of 1490 tons has been loaded in six hours.

7. Aerial Ropeways. — These ropeways may be divided into five classes :

a. Single supporting rope, with or without a hauling rope.

b. Endless rope, which is the supporting rope and hauling rope

at the same time.

c. Two supporting ropes and an endless rope for hauling the load.

d. Double endless travelling rope or chain.

e. Telpherage line.

a. Lines erected on the first of these principles may be seen in hilly countries. An iron or steel wire rope is stretched across a valley, and forms the rail .

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