Post by
diabase1 on Sep 20, 2023 7:25am
Milligan 2
In 1978, the Ontario Geological Survey came out with Mineral Deposits Circular 17, Ontario Occurrences Of Float, Placer Gold, and Other Heavy Minerals. It outlines the orientation of long axis of till pebbles, which may be useful information for the Milligan property. It also shows a more detailed sketch of the mercury and gold anomalies in the Eastford Lake area, just west of the Milligan property.
In 1984, the OGS released Map 80577, a time-domain INPUT Airborne Electromagnetic and Total Intensity Magnetic Survey of Milligan Township. The survey did not intercept any bedrock conductors within RT Mineral's Milligan property. However, the strong northwest-southeast magnetic trend skirts by the NW corner of the property. It also shows a series of magnetic lows along the east contact. It is reasonable to think that some of this magnetic low is due to the dipole effect from such a strong magnetic anomaly. With respect to the strong magnetic response, there is every possibility that the source is peridotite, as opposed to diabase. Also noteworthy is that there were no EM conductors intercepted in the Eastford Lake gold discovery area.
Just to the southwest of the Milligan property, there is a large positive magnetic anomaly that is approximately 1.2 km long by 600m wide. It appears to be dipping to the south and plunging to the west. Could this be an ultramafic intrusive pipe (nickel target)? Two or three lines of MMI soil samples would perhaps explain the source!
In referring to Map P.2735, glaciolacustrine offshore coarse-grained deposits, sand with minor gravel, have been indicated to underlie the Milligan property.
In 1987, the OGS released the GEOLOGICAL DATA INVENTORY FOLIO (GDIF 370) map for Milligan Township. It's a report that contains a lot of information pertaining to references for the past exploration work carried out within Milligan Township. With respect to RT Minerals property, it shows the location of one geochemical sample (till-gravel) site of W.G. Wahl. It's located within the north end of the property. He was looking for gold, but no results were given. However, on Map 2 at the back of the report, they mention that information may be available in the Assessment Files in the Resident Geologist's Office in Kirkland Lake. It's worth checking out!!
In 1989, the OGS released Map 81254, an Airborne Electromagnetic and Total Intensity Magnetic Survey that covers the Rayner Lake Area. I noted the large, folded, high intensity magnetic anomaly that also has a lot of EM anomalies associated with it. Towards the south, the wide, single magnetic trend continues south to the next map (Map 80577). As we have seen, this single magnetic trend has been invariably been called a diabase dyke by some people. However, judging by the magnetic activity of the magnetics with the large anomaly to the north, from my prospective, the underlying rock types in this area, are ultramafic intrusive rocks. If that is the case, then the magnetic trend that skirts past the western claim boundary of RT Minerals' property could also be a peridotite.
There is one question that I have though, and that is, why doesn't the peridotite band that passes by RT Minerals property have any EM anomalies, like the larger magnetic anomaly to the north (Map 81254). My only thought at this time, is that it has something to do with the degree of serpentinization. The higher the serpentinization, the more conductive the peridotite is. Therefore, the peridotite near the Milligan property is poorly serpentinized, if at all. Note also that there are no airborne EM anomalies in the Eastford Lake gold discovery area.
However, note on Map 81254 that there are EM anomalies along the eastern contact of this magnetic trend, that heads toward the RT Minerals property. It appears to indicate that there could be weaker conductors near the east side of this peridotite band, within RT Minerals' property.