Interesting stuff:
In 1976, a decision was made to develop the Langmuir No.1 deposit as a supplementary ore source to the Langmuir No.2 mine. The Langmuir No.1 deposit was accessed by a 1250-foot long 12 foot by 15-foot ramp, which stopped 400 feet short of the deposit. Noranda ceased underground development in 1977 due to “deteriorating economic conditions at the Langmuir No. 2 deposit”.
During 1986, Noranda Exploration Co. Ltd. donated the drill core (to the drill core library maintained by the Ontario Geological Survey) for drill hole number L72-8, which is located in the Langmuir No.2 Mine area, along with complete geology and assay results. The zone averaged 0.335% Ni over 131.1 feet (39.96m) containing highest results of 1.31% Ni over 0.4 feet (0.12m) (Assessment File T-1660).
The exploration activities of Timmins Nickel Inc. during 1989 were covered by a report by Derry, Michener, Booth and Wahl (Timmins Assessment File T-4077.)
They completed an independent resource estimation of the Langmuir No.1 deposit which resulted in 164,450 tons at 2.10% Ni. This is based only on the INCO diamond drilling during the 1960’s, as the Noranda drilling completed in 1976 was not available to them. The parameters used were 4 foot minimum mining width, 0.95% Ni minimum grade (cut off), 50 foot projection to nearest hole and if none present then a projection of 25 feet were used, 95% recovery of nickel mineralization, a 20% dilution factor and a tonnage factor of 11.0 cubic feet per ton. The resource was calculated from 50 feet to 400 feet vertically from surface. The crown pillar area from 50 to 150 feet below surface contained 7,493 tons averaging 2.21% Ni (contained in the above resource figure).”
