C.—3

214

Subject L.— A Knowledge of the different Bocks where Gold, Silver, Tin, Copper, Zinc, Lead, and Antimony are found, and the Formation of Lodes and Leads. 1. Where and in what forms are gold and silver found in New Zealand? Describe a golddredging plant in detail. Subject X.— A Knowledge of Underground Surveying, and of making Plans of the Underground Workings, showing the Dip or Inclination and Strike of the Beefs or Lodes. 1, For the purpose of undertaking the survey of underground workings in a mine, how would you transfer the true bearing from the surface by means of a deep shaft? 2. Compute and tabulate the traverse shown upon the following diagram, giving the total distances of each station on the meridian and perpendicular referred to station (i) as zero. The distances are given in links.

3. Describe a simple and effective manner of collimating the horizontal wire in a dumpy level. 4. Describe your method of ascertaining the dip or inclination and strike of reefs or lodes. 5. Describe the different kinds of mining claims, and state generally their form, area, and how they should be marked on the ground. 6. The candidate will be required to undergo an oral examination by the examiner, including questions as to the use and adjustment of the theodolite and other instruments. Questions to be Used in Examination of Battery-superintendents for Certificates. Subject A. — The Different Modes of Beducing and Pulverising Ores. 1. State fully where you have been employed during the last two years, giving the dates, and names of your employers, and nature of such employment. 2. Describe fully how you would construct a complete crushing-plant, with twenty stamps, and everything necessary to extract the bullion from the ore and have it in bars ready for market. Also give the relative heights of the different portions of the plant above the ground-floor. 3. Show by calculation the diameter of the cylinder of a steam-engine required to drive twentystamps, ninety-five blows per minute, having a drop of 7 in., the head of each stamp and shoe being 2 ft. high and B^-in. in diameter, the stem 15 ft. long and 3 in. in diameter, tbe tappet being 1141b.; the steam entering the cylinder at 100 lb.-to-square-inch pressure, and cut off at three-eighths of the stroke. 4. Show by calculation the diameter of nozzle required to work a Pelton water-wheel so as to give forty effective horse-power ; the head of water on the nozzle being 160 ft. 5. Describe a Huntingdon and also a Krupp crushing-mill, their size and capacity, the horsepower required to work each, and also the most economical speed to work them at. 6. What mesh of grating would you use in a stamp mill if the gold was finely divided amongst the ore-gangue, and give your reason for same. Subject B.— Amaigamating-machines. 1. Show by sketch a McKay pan, also a Watson-Denny pan. Describe fully the speed each pan requires to be driven, the quantity of quicksilver required for amalgamation in those pans, the quantity of ore they will treat in twenty-four hours, and the horse-power required to work them. 2. Give the dimensions of a settler ; explain fully its use, and the method of working it. 3. Describe fully how you would construct a plant of twelve berdans—the method of feeding, the quantity of quicksilver you would use in each berdan, the quantity of ore they would treat in twenty-four hours, the speed you would work them'at, and the horse-power required to work them. 4. Give your experience with working concentrators; explain fully their use, how they are worked, their speed and capacity ; also the class of ore requiring concentration. 5. Show by sketch how you would construct amalgamating-tables, giving all dimensions of a table suitable to take the pulverised ore from five heads of stamps. Describe fully.