Examination questions for certificates of competency as mine inspector, mine foreman, mine manager, fireboss, hoisting engineer, etc. as given by the state examining boards; together with answers by Unknown

Author:Unknown
Language: eng
Format: epub
Tags: Mining engineering
Publisher: Scranton, Pa., International textbook company
Published: 1907-03-25T05:00:00+00:00

Pio. 6

and ventilate this seam and the Orchard seam. There are two methods, either of which may be adopted in the two last-named circulations. In one plan, intake airways may be driven in the Buck Mountain and Orchard seams, thereby making each circulation independent of the others. In another plan, instead of driving intake airways in the Buck Mountain and Orchard seams, the intake air for each may be taken down airways driven in the Mammoth seam, one on either side of the main slope. Regulators, to be used only in case of emergency, should be placed on the intake airways of the Orchard and Buck Moiuitain seams for the purpose of combining the three ventilators so as to work on a single current if needed. Likewise, also, regulators may be placed, to be used only in case of emergency, at the mouth of the lifts on the Mammoth seam, so that they will not interfere with the hoisting on the main slope.

QuES. 1366.—Describe the method of ventilating any large

coal mine, with which you are familiar, and state how, in your

opinion, it could be improved upon. /.— Pa. {A)

* Ans. —Fig, 7 shows a system of ventilation that is frequently used, in

which the air-current is conducted around the entire working face of one

section of a mine, passing through the cross-cuts or break-thtoughs between

the rooms. This system has the disadvantage of carrying all the gas and

smoke from one breast to another, and should never be used in a very gaseous seam. Another method is to supply each breast or group of six or eight breasts with fresh air from the gangway, conducting the air up the manway on one side of the breast, and down the other side, returning the current to the return airway: or if the air is taken from an airway driven above the gangway, the air from the breasts is returned into the gangway at once. In this way, each breast or group of breasts will be provided with its own circulation, and will be safer.

QuES. 1367.—Give the plan

or system of ventilation in use

in some mine in which you

^^^^g^tU^t^^^^^^^^^^m have worked, also give name

Pio.7 of mine. F.—Pa. (A)

An8. —In the ventilation of many steep pitching anthracite seams, a

small monkey airway c, Pig. 8, is driven in the top bench of the seam

above the main level g. The main gangway is made the intake, the air being conducted along the gangway to the inner face and returned along the face of the breasts by means of the monkey airway, which is connected with each breast by a short cross-cut d, near the foot of the manway..

CHAPTER XV

OPENING A MINE

MINE OPENINGS

QuES. 1400.—What is a slope ? Adrift? A plane?

F—Pa. {A)

Ans. —A slope is any inclined mine opening or passageway driven in, or from the surface to, the seam, or underground from one seam to another; if this passage is driven'through rock, it is called a rock slope.

A drift is a practically level passageway driven in the seam itself, usually from the surface.

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