Post by
DDEngineering on Mar 14, 2022 9:58pm
Asbestos
From the February 17,2021 NI 43-101 page 26
On the Property itself, the earliest exploration in the area was carried out on the asbestos-bearing ultramafic rocks around Rahn Lake in 1919, followed by a period of limited mining in 1936 and 1939 by Rahn Lake Mines Corporation, Limited who acquired the property from Clover Leaf Mining Company Limited and The Empire Asbestos Mines Company. Two shafts were sunk on the Property during this period; the first shaft reached an ultimate depth of 42.8 m (140 feet) and the second shaft reached an ultimate depth of 18.3 m (60 feet). In 1936, a total of 1,784 t (1,966.5 tons) of rock including 1,338.6 t (1,475.5 tons) of asbestos ore were hoisted from the two shafts (Sinclair et al., 1937); asbestos valued at $250 was shipped (Hewitt and Satterly, 1953). In 1939, a total of 1,069.6 t (1,179 tons) of rock was hoisted from the 30.5 m (100-foot) level of the first shaft producing 547.9 t (604 tons) of sorted crude asbestos ore (Tower et al., 1940) with a final milled product of 16.3 t (18 tons) of asbestos valued at $720 (Hewitt and Satterly, 1953). Montrose Mines, Limited (“Montrose”) took over the property in 1940 but no further production is reported. Subsequent to Montrose, York Asbestos Mines, Limited took over development of the property. A magnetic survey and 2,691 m (8,500 feet) of follow-up diamond drilling was carried out by Lundberg Exploration, Limited in 1951 and 1952. A “No.5 zone” carrying short-fibre chrysotile is described to be located about 1.5 km south of the main shaft (ibid.). Additional asbestos production in the area comes from the ultramafic rocks in Midlothian Township, 12 km to the south-southeast of Rahn Lake. That area was originally explored around the same time of the work at Rahn Lake; however, it was not until the period between 1975 and 1977 that the Lloyd Lake deposit was exploited by United Asbestos Incorporated (Kretschmar and Kretschmar, 1986).