FAULT SOUTH RAR AR eR ee ee | CASSIAR ASBESTOS CORPORATION LIMITED f] ORE | SERPENTINE OBLIQUE SECTION SHOWING SOUTHERN ORE EXTENSION 1 I ARGILLITE & VOLCANICS t = ; FIGURE 6 — Oblique section showing southern ore extension. design must be revised to ensure a continuous ore supply. Comparable arguments apply to possible pre- ceding designs and/or increment trials. All drill holes are surveyed using the Sperry-Sun single-shot device. Where magnetic deflections are suspected, the Sperry-Sun Surwell Gyro survey is used for exact hole location. No water under pressure has been encountered by diamond drilling, although groundwater is naturally found in the holes. This lack of head and slow re- charge has indicated that there is no perched water table (or very local ones) within the pit. A plan of pit water flows and drill-hole water levels is maintained during the summer months to aid in groundwater studies. Diamond drill core is stored in a central plant- site facility for colour photography (Fig. 7), geo- logical and fibre logging, and possible test milling. ADIT EXPLORATION Exploration adits were collared in 1952 at the 6000- ft (1829-m) elevation and in 1958 at the 5700-ft (1737-m) elevation. These adits traversed the orebody and provided valuable bulk sample data as to grade and dollar value, as well as providing geological map- ping sites. Some limited underground diamond drilling also was done. Mining has since removed the 6000-ft (1829-m) adit and portions of the 5700-ft (1737-m) adit. Grade Control Daily grade control comprises face mapping and examination of all blast-hole drill cuttings within the pit. Blast plans are prepared showing the various FIGURE 7 — Photograph of HQ diamond drill core. lithologies present in each blast, as well as fibre grade and quality (dusty, wet) estimates of serpen- tine holes. As well, daily mucking sheets are main- tained in the mine shifter’s office showing the grade and quality of the ore available to be mined and the planned mining parameters. Plans of the mill’s out- side ore storage areas and dry rock storage are main- tained in the mill shifter’s office to provide informa- tion for blending and quality control. Daily examina- tion of mine ore delivery, mill production, mill storage areas and laboratory assay results yields a i