MINING

Otago Daily Times, Issue 18746, 27 December 1922, Page 7

MINING

LYELL MINES. Operations at the North Lyell Mine are being continued with an output of about 7000 tons a month of an average value' of nearly 7 per cent, copper. At the 1100 ft level, Nos. 35, 36, 37, and 41 slopes are being regularly worked. The usual tonnage o£ good grade oro is being won from No. 41 stopo. At the N. end of workings at 1000 ft level, No. 40 slope continues to produce a large tonnage of ore from the ground floor, and overhead a good body of fairmrado or© has been opened up by means of No. 3 north drive at the 925 ft level. Seven slopes are being actively worked. This level continues to maintain its position as the largest productive level of tho mine. No. 51 stop©, which has been beaten out on the ground flooor, is being regularly worked overhead, and the oro generally throughout the level is good. At the 850 ft level four slopes arc in active operation, and No. 20 stope, which has been a constant producer of excellent grade oro for over 15 years, is still supplying a large quantity of similar-grad© material. At tho northern end of the level, No. 50 stope continues to be worked without interruption on tho ground floor. This ore body has been opened up for> a length of over 300 ft with an area of ore increasing at the northern end, disclosing a fair tonnage of rich oro. The output of 7000 tons a month is being maintained with practically one shift working, and the mine is ready to increase tho output to 12,000 tons a month as soon as the alterations and additions to the treatment plant at the. reduction works are completed. At the Mount- Lyell Mine operations continue restricted to the winning of pyrites for export to the chemical works in Melbourne, and a small tonnage required forsmelting in the treatment of concentrates at the reduction works. One furnace and sintering and flotation plantsare running with satisfactory results. It is understood that they have had a favourable smelting run.