Small Diameter Fuse

CIM Bulletin, 1962

DELNITE Mines Limited is located in Deloro township, on the west end of the south break of the Porcupine Camp. Mining operations are currently being carried out on the downward extension of a system of quartz veins in an andesite zone. This zone has been followed from surface to the present bottom level of 5,250 feet. The changing mineralogy of the vein system has involved an increase in tourmaline content from the surface downwards, so that the veins at the lower levels are composed of dark brown quartz-tourmaline. The drilling problem presented by these extremely hard veins was partially alleviated by the development and adoption of a one-inch drill bit. All blast-hole drilling is now done with the one-inch bit, without any difference in hole spacing.
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