130

a—b

APPENDIX I.

MINE-MANAGIES' 3AND BATTERY-SUPERINTENDENTS' EXAMINATION PAPERS. Questions to be used in Examination of Mining Managers for First-class and Secondclass Certificates. Subject A,— The Laying-out and Construction of Shafts, Chambers, Mam Drives, Adits, Rises, Stopes, &c. 1. From the following notes draw a section on a scale of 100 leet to an inch. Position A is the most westerly (left-hand side of drawing): —

Show the relation of the reefs to each other. The boreholes fail to prove any other reefs at lesser or greater depth. By trenching and boring on the line of strike, the several reefs are found to maintain their widths and values for a distance of 2,000 feet _.'.,«_• It is desired to open out a mine in two main divisions. Show the best method of doing this assumin" tie ree to live down to 100 feet below sea-level. Allowing 38 cwt per cubic yard o t r e an average value of £3 10s. per ton, and .an efficient extraction at the battery of 95 per cent calculate the tonnage and value which each opening would command 2 How would you proceed with the sinking of a three-compartment shaft intended for a large output, the first 80 feet being soft wet ground resting on hard rock? Show how the sides wrvnlrl he secured and the water kept back. , ~ ~ would teHMueal a neceggary J secure a chamber with brickwork (t he top being arched), would you build solid against the country or not? Give reasons for answer. - } 4 An adit tunnel, with a clear superficial area of not less than 60 square feet has to be driven through damp ground liable to swell: how would you construct such a tunnel to serve for the life of the mine, which is estimated at twenty-five years? 5 An area of 30 acres of auriferous gravel has to be worked from a depth of 120 ft The deoosit is lying practically horizontal, is 3 feet in thickness, and immediately overlaid by 25 feet Shard conlpact-nd. Show how you would open and work the mine. Carbonic-acid gas has to be dealt with. Subject 8.-On the Timbering of Shafts, Adits, Main Drives or Levels Passes Stopes, and generally on the Systems of timbering Mines, and also m filling up Old 11 orkmgs. 1 Describe' and sketch the method of timbering a large rectangular shaft divided into four compartments for winding, pumping, and ladder-way; provision to be made for catching the PUm l r A which is very liable to swell, has to be maintained 8 feet 6 inches wi j„ f or a double road. Show how you would timber it. 3 An old level originally driven 6 feet 6 inches high by 4 feet 6 inches wide, collapsed. After being dosed for a considerable time it has to be reopened and enlarged to 7 feet high by 9 feet wide Show how you would proceed with the work and securely timber the level. 4 In working a reef it is found that the heavy caps used in timbering the main levels are H«Mp to break The reef is of considerable width and somewhat variable inclination the very li able to !»**•"» re * SQO A mo(M cation of the " square set " system is adopted for Srung £_ X ground is kept only moderately well filled What is the cause of the breakage of heavy caps in the levels, and what would you do to obviate this? 5 Describe and illustrate by sketch, how a three-compartment pass would be constructed, m-fltp the uses to which the compartments would be put. ~_»«. j.v _ • 6 Show how you would timber the stopes in a reef 6 feet wide lying at 6d° from the horizon, the haneine-wall being firm and the foot-watl subject to slippery pints. the hanging wan m fa quegtion; would yon bnry or draw the back economy) timber has to be drawn, what method would you adopt to do this with safety?

' Position. Altitude Horizontal above Sea- : Distance East : Remarks, level. from A. -- A B C D E F ee . ' ■ Eeef-outcrop 4 ft. 0 in. wide, dipping east 32° from horizon. l!068 385 „ 5 ft. 6 in. „ „ 55° 965 680 . j „ 4 ft. 6 in. „ „ 78° 898 815 , Vertical borehole 445 ft. to reef. | Eeef ig u fl wide _ 750 I 985 „ 530 it. „ I 700 1,400 I Ground practically level beyond i.