RE:Mcquibban 5Garland, I think we are talking about two different magnetic features. You're referring to the one that is 1.75 miles NW of McQuibban Lake. The one that Glencairn Exploration drilled. I'll call it the Glencairn Anomaly.
I'm talking about the circular magnetic feature that is located directly west of RTM's property. If you take a look at Map 82811, you will see that it sits mostly within the south bay of Pierre Lake. I'll call it the South Bay Anomaly.
Glencairn Anomaly
If you look at Lake Shore Gold's Total Magnetic Intensity Map (20000002703/20004201), this large magnetic anomaly looks like it could be a multi-phased type of intrusive. Glencairn Exploration intersected quartz monzonite and granodiorite, while the OGS geologists show the interpretation of the aeromagnetic anomaly as either gabbro, anorthosite or ultramafic rocks (Map P.3599). The 1% magnetite that they got in their drill hole probably reflects the felsic intrusive rocks. Utramafic rocks will generally give much higher numbers, so I agree with you that the source is probably ultramafic.
Where did Noranda Exploration get Glencairn's report? Sometimes these older reports are sitting in a cabinet in the Resident Geologist's office in Kirkland Lake. Maybe that's where it is!!
Where did the Ni/Cu alluvial indicator grains come from? If the glacial ice direction was NNW/SSE, then perhaps the source for these grains may have come from the western edge of the Glencairn Anomaly in Swartman Twp.
South Bay Anomaly
Take a look at Map 82811 for a better view of this magnetic anomaly. It is mostly located in the South Bay of Pierre Lake, with the eastern portion on land, just off the western end of RTM's property.
There are no records of any work been done on this anomaly.
With respect to the 139 Ni/Cu alluvial indicator grains, it would seem to me that the large number of grains from one sample means that they probably didn't come from a far distance. Whether it be from the South Bay Anomaly or the Glencairn Anomaly, who knows!!