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I. J. T. O'Hagan, after whom the Leitch mine is named, began mining in 1939, extending the shaft down to 160 m. In 1960 O'Hagan completed development of the property which yielded approximately 90,000 oz. (2,600 g) of gold over a period of 7 years. Since 1960, the mine has been worked in conjunction with the Northern Empire Mine. In the fall of 1964 the Northern Empire Mine was deepened to 1500 m, and the orebody was divided into 2 units. Leitch No. 1, which lies to the east of the Northern Empire, is 600 m long and averages 30 m wide. A total of 10 m of mining has been done at this depth. The orebody, which is 50% metalliferous, consists of narrow quartz veins, commonly 5 to 10 cm wide, with slightly larger intervals. Gold occurs in the quartz veins in the form of both discrete grains and disseminated in quartz as a zone. The zone is characterized by a thick, white chlorite-sericite banding parallel to the walls of the quartz vein. The gold occurs in quartz associated with adularia and in quartz-rhytidolite with adularia. Metal values range from 0.03 to 0.82 g/t gold. The quartz veins, which are 100-300 cm long, sometimes lie parallel to the iron-bearing rocks of the Beardmore and Geraldton areas. The quartz veins are deformed and contorted, and are characterized by a folded 'crack-seal' texture. The mines reached a depth of 240 m in 1966, and a depth of 1400 m in 1968. The gold production from the Leitch No. 1 workings in 1967 was 0.01 oz. per day and in 1968 was 0.04 oz. per day. The Leitch No. 1 shaft reached a depth of 320 m in 1969, and was closed down in that year. The mine has been worked intermittently since it was first opened in 1939. The annual production of the mine has ranged from 0.8 to 1.4 oz. per day. The Leitch No. 1 workings have averaged a low production of 0.5 oz. per day.
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