Post by
diabase1 on Jan 18, 2023 12:47pm
Ireland3
From the Lake Shore Gold airborne survey in 2007 (MNDM Assessment File 20000002703/20004200), the large magnetic feature was intercepted within the middle of Ireland Township. It exhibits a multi-phased type of magnetic anomaly (highs and lows) that perhaps relates to the different types of rocks within the suspected intrusive.
The overall appearance of the regional magnetic background towards the west of the Ireland Complex, looks like a comet with the tail heading in a northwest direction, and then in a westerly direction towards the Kapuskasing Structural Zone. Could the tail be the root or a feeder zone to the plume, which could be the Ireland Complex anomaly?
There are 2 smaller magnetic anomalies, one just outside the southwestern edge of the main feature, and a second located just outside the southeastern corner of the main anomaly. Both of these could have important implications.
In 2009, Northern Shield Resources carried out a Helicopter VTEM and Magnetic survey. Referring to the report (Assessment File 20000000160/20000921), it will be noted in Figure 4 that the main intrusive has been clearly outlined. Also noted are the 2 smaller magnetic structures mentioned above.
Again, looking at Figure 4 (Assessment File 20000000160/20000921), near the west side of the large magnetic feature, it would appear that this smaller magnetic anomaly has been faulted off from the larger, main anomaly . Also, refer to Figure 5, (Assessment File 20000004588/20006749) to get a better sense of the interpreted faults.
This detached area is an area where Lake Shore Gold drilled 2 holes (Assessment File 20000003914/20005893). These 2 drill holes were located near this detaching north-south fault, and within magnetic lows, with both holes intersecting quartz monzonite, clastic metasedimentary rocks, and granite. Hole LA07-02 also intersected 5% pyrrhotite, trace chalcopyrite and blue quartz eyes (riebeckite?) over narrow widths. Hole LA07-03 intersected much the same rocktypes, but also an oxidized zone near the overburden/bedrock contact. This was the only hole of the two, that contained this oxidized zone (regolith?). They never assayed any core in the area of the oxidized zone.
Drill holes LA07-04 and LA07-05 were put down further to the northwest, on what I have described as being the tail of the comet. Similar rock types were intercepted, but no values of any significance were encountered. However, LA07-05 did have a zone of heavily fractured, and oxidation, near the top of the hole. Also, LA07-04 had an 8m section of lamprophyre, indicating a deep structure from the mantle.
Some pages from Lake Shore Gold's DDH 2 and 3 drill logs are missing. Perhaps RTM should consider contacting Lake Shore Gold and request a copy of the missing drill logs. They were getting gold towards the bottom of the holes (as indicated on the drill hole cross sections) and these are the pages that are missing!! It would be very interesting to know what the host rocks are. Also, according to the drill logs, the drill core is stored at Lake Shore Gold's mine site in Timmins.