Rottenstone Mine Past and Presentl
Claude Resources Inc. staked favourable geology surrounding the Rottenstone Mine in 1983 and in 1985 acquired the Mining Lease encompassing the Rottenstone Mine from Rottenstone Mining Ltd. INCO explored the Rottenstone property 1990 – 1992 under an option agreement with Claude. Exploration consisted of geological mapping and a UTEM survey that was successful in defining several conductors within the property; however, INCO deemed the conductors too small and subsequently dropped the option.
Uravan Minerals Inc. in 1998 staked a large claim block (>35,000 ha) surrounding the Claude Resources Mining Lease and also acquired the Mining Lease from Claude in the same year.
Uravan acquired the property in 1998 and compiled the previous data into the first comprehensive database. During Uravan’s tenure regional airborne geophysical surveys in conjunction with regional heli-borne biogeochemical surveys along with follow-up ground geophysical surveys (Electromagnetic TEM, Gravity and IP) and some detailed ground geochemical surveys focused Uravan’s exploration efforts within the immediate area of the previously exploited Rottenstone deposit, but also to some more distant targets. Uravan drilled fourty (40) drill holes (8,146.3 m) testing various targets. In 2008 Mantis conducted a heli-borne VTEM / MAG survey over the Rottenstone property area confirming previously defined (by Uravan and previous operators) geophysical conductors and then followed the VTEM survey with detailed ground MaxMin surveys over select conductors then tested some conductors with drilling. In all, seven (7) drill holes were drilled amounting to 1,176.5 m drilled. The drilling did not yield any economic drill intersections. Although previous efforts were not successful in finding additional Rottenstone-style mineralization it is Fathom’s opinion after a comprehensive review of this data, there is ample evidence suggesting multiple discoveries forthcoming.
Fathom Minerals Ltd. (Fathom) acquired the Rottenstone Property in June 2015. The Rottenstone Property, located in northern Saskatchewan, has a long history of exploration and mining dating back to 1928. The “Rottenstone Deposit”, a nickel–copper plus platinum group elements and gold (Ni-Cu + PGE, Co+Au) deposit was discovered and defined by several drilling initiatives between 1929 – 1962. Reported resource estimates and average grade for the Rottenstone deposit varied through the exploration history; however, SK government records suggest up to 60,000 tons of Ni-Cu +PGE, Au ore (2% Ni, 2% Cu and 12.69 g/t Pt+Pd+Au) existed at Rottenstone prior to commencement of mining.
Rottenstone Mines Ltd. mined the deposit by open pit 1965 – 1969 and in all exploited 26,058 tonnes. Average reported grades for the initial year of production (1965) were 3.28% Ni, 1.83% Cu and 9.63 g/t Pt-Pd, + Au. A Ni-Cu, Pt-Pd +Au concentrate was produced on site and shipped via winter road, highway and rail car to Copper Cliff ON for final refining.
To this date the Rottenstone mineralization is recognized to be of exceptional grade, perhaps the highest grade of this type of mineralization ever mined in Canada.
History of Exploration and Mining