a—2

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2. A seam of coal dipping 15 degrees is thrown down 320 ft. by a vertical fault. A slope is started from the top of the downthrow, and cuts the seam 480 ft. horizontally from the fault. Required, the length and dip of the slope AB.

3. The area of a rectangular mining lease is 140 acres, and its width is 33 chains 18 links : find its length. Subject Vl.— General and Applied Geology. 1. Carefully describe the action of running water and ice as geological agents. 2. State how water, ice, and other geological agents, assist, or have assisted, the miner (a) by exposing metalliferous lodes, (b) by forming workable alluvial deposits of gold, stream tin, &c. [Note. —The candidate, if he likes, may combine his answer to this question with his answer to question I.] 3. Give a table showing the sequence of the principal geological formations in New Zealand, or in Great Britain. 4. Define the terms —" Sedimentary rock," " igneous rock," " fossil," " strike," " dip." How do you in practice ascertain the strike and dip of an outcropping stratum ? 5. Give a sketch of the geology of any mining district in New Zealand with which you have a personal acquaintance. 6. Give as full an account as you cap of the part water is supposed to play in the formation of quartz lodes. Whence do you consider this water is derived? 7. What changes (if any) are likely to take place in the course of time in the contents of a quartz lode originally containing gold and silver associated with sulphides of iron, copper, and other metals (a) near the surface, (b) at a moderate depth, (c) at great depth ? 8. Where, in New Zealand, are found asbestos, antimony ores, copper ores, stream tin, phosphate rock? 9. Define the terms —"normal fault," "reversed fault"; and give illustrative sketches. If in drifting or driving you came across a polished surface striking north and south, and dipping at, say, 70° to the west, but having upon it parallel scratches or grooves inclined southward from the direction of dip, what inference concerning the direction of movement of the country would you make ? 10. In a district containing numerous quartz lodes, faulting has taken place both prior to and subsequent to the formation of the lodes : explain how you would distinguish the earlier faults from the later faults. Give a figure or figures to illustrate your answer. 11. A quartz lode striking north 45° east, and dipping at 65° to the south-east, is cut off by a strong fault striking north and south, and dipping at 70° to the west: where would you look for the faulted portion of the lode, and why ? Give illustrative diagram. If the faultplane showed scratches or grooves inclined southward from the direction of dip (as in question 9), how would your method of search be affected? 12. Why do mines get hotter with depth? Is the rate of increase of temperature the same in all mining districts, or not? State as fully as you can any figures or other data referring to the rate of increase of temperature in the earth's crust in any part of the world. QUESTIONS ASKED AT THE 1914 EXAMINATION FOR BATTERY SUPERINTENDENTS' CERTIFICATES OF COMPETENCY. Subject A.— The Different Modes of reducing and pulverizing Ores. 1. Give an intelligent sketch of a crushing-hattery capable of reducing 100 tons of hard auriferous quartz ore per day of twenty-four hours to a sufficient degree of fineness so that the gold can be extracted by means of the cyanide process, with all appliances to convert the bullion into a marketable commodity, (a) Show by figures the relative levels of the different appliances ; (b) give a detailed estimate of the cost of such a crushing plant and a description of the different appliances. 2. In lighting battery-buildings 100 lamps of 16 candle-power and 10 lamps of 20 candle-power are required : how many kilowatts would a dynamo have to produce to give the required power ? Also give the pressure and volume you would use, and give reasons for same. 3. Describe a Huntingdon mill of 5 ft. diameter, giving its speed and capacity with suitable rockbreakers to pulverize the ore, so that it will pass through a screen of 25-mesh ; also give the horse-power required to drive it. 4. If the gold in the ore was in a very finely divided state, what appliances would you use to pulverize it to sufficient fineness to enable it to be attacked by cyanide solutions %