RTM Case Batholith UpdateThe following are a few comments on the large Case Batholith property that was expanded, based on RT Mineral's news release of July 20, 2023. It includes within it, 2 smaller blocks that I have already discussed in a previous post on April 10, termed Group A and Group D. These 2 blocks are obvious (Group A is located in the northern edge of the new, larger block and Group D is located in the southeastern edge of the larger block), when you refer to the magnetics in Map 82815.
However, there is now a third obvious magnetic feature located near the southwest corner of the block. It is a plume-shaped magnetic feature, where the western end appears to have been affected by a strong north-south diabase dyke. It's length is approximately 1800m long and its average width is about 900m. Could this magnetic anomaly be related to a slightly more mafic pluton, within the more felsic Case Batholith, such as a quartz monzonite? I suspect the 'pluton' has a top (younging direction) to the east, while the base is towards the west. Could this 'pluton' hold other mineralization besides either lithium or cesium?
According to Map 2555, the Quaternary Map indicates that there are outcrops in the area, as does Map P.2243, with the latter showing quartz monzonite and pegmatite.
The remainder of the large block is magnetically flat. However, I do see areas where there could be some weak magnetic trends of importance. In order to confirm these magnetic trends, which are weak, there are 2 options to consider, that may reveal some interesting geological environments:
1) re-fly the block at 100m spacing, or
2) re-contour the present data at a 2 nT interval.
The 2nd option would seem to be the more logical option, as it is the most cost effective route to take. The original data was contoured at 5 nT and with the data background rather clean, it seems that the resultant re- contoured map would likely show the weaker magnetic trends reasonably well. It may be worth a try.