Answers to Correspondents

“G. B. Mc Keown” (Draperstown).–Mineral analysis; with comments, as follows:–One sample, which contained a small vein of mineral substance about quarter of an inch thick has been found to contain–Copper sulphide, 11.2 per cent.; Iron Sulphide, 7.7 per cent., insoluble matter, 80.2 per cent. This, of course refers only to the sample submitted, and the percentage of copper is high, but this must be taken only as an indication of the occurrence of copper. A vein of such thickness would not be worth working, but may point to a larger body on further prospecting. The marked samples give the following quantative results:–1. Very faint traces of copper. 2. Isolated crystals found to contain copper. 3. Green colouration due to copper. 4. Green streaks containing copper. 5. Pyrites containing no copper. Three other samples were also examined, amongst which was one of galena. The other two contained traces of copper.