Leading Edge MAG SYSTEM, Maps Extensive Lithium Bearing Pegmatite Dyke Swarm, LNPG Project, NWT
06.07.2023 | The Newswire
Highlights
-
- July, 6th 2023 - Lake Winn Resources Corp. ("Lake Winn" or the "Company") (TSXV:LWR) (FSE:EE1A) is pleased to announce that it has received the final processed data from Dias Geophysical QMAGT system. We believe that the QMAGT system has successfully mapped the LCT pegmatite dyke swarm. Anomalies coinciding with the known dykes appear to coalesce into numerous larger anomalies which range from 10 m to 100m widths and can be intermittently traced along strike for up to 7 km. Historic drilling and channel sampling has proven numerous intervals of mineralized pegmatite grading >1% LiO2 over 1 m to 16.65 m intervals. The QMAGT results will greatly assist the upcoming field mapping and drill program.
QMAGT System
The QMAGT system is a helicopter-borne magnetic survey system utilizing a SQUID (superconducting quantum interference device) sensor measures the complete gradient tensor of the earth's magnetic field. The SQUID sensors are developed by Supracon AG of Jena, Germany. Operating within a liquid helium bath, the sensors measure the magnetic field with great sensitivity. The survey was not without its challenges due to weather and topography, the system lost sensitivity over the steep cirque valleys (difficult to drape by any system) and in the last flight when it was running low on helium. Elsewhere the system delivered numerous vector products of excellent quality. These will be passed on to consultants to model the magnetic sources in 3-D, a task the vector data is well suited for. For this news release we will focus on the Bzz data channel which maps the vertical magnetic gradient.
Vertical Gradient Results and Interpretation
Figure 1 shows a colored grid map of the Bzz data channel from the survey, the left image is colored, so the zones of high gradient are the "hot" red colors, the right image is colored by reversing the palette so that the zones of low gradient are the "hot" red colors. The current thinking is that the LCT pegmatites have very little magnetic response, so they are the zones of low gradient, whereas when they were intruded into the surrounding sandstones, a hornfels was formed causing the high vertical gradients. The red colors in the right image of Figure 1 thought to map directly the LCT pegmatite dykes. It is an exciting result. Other vectors like Bxy (not shown) support this interpretation with coincident anomalies matching the reds in the reverse color image for Bzz. The results show a dense swarm of pegmatites, tens of metres across near northern drill holes. Drill hole MAC06 encountered 17.96 m of LCT pegmatite grading 1.03% LiO2 and drill MAC07 drilled from the same site at a 60° dip encountered 10.94 m of LCT pegmatite grading 1.47% LiO2 (Figure 2). In Figure 1 a strong LCT pegmatite response can be seen semi-continuous over the entire property measuring approximately 100 m across over many kilometres. Close inspection of nearby historic collars suggest they drilled near but above this target. One of the first tasks for our field crews this summer will be to ground truth these anomalies.
Click Image To View Full SizeFigure 1 (Left Image): Bzz (Measured vertical Gradient) flown over the center portion of the LNPG project in the NWT near the Yukon border. White dots are the historic drill holes with their traces. The long linear, "red" responses (high vertical gradient) are interpreted as hornfels (heat altered sediments) that brace either side of the pegmatite dykes which are mapped as "Blue" zones of lower vertical gradient. (Right Image) The same Bzz data image with the color system reversed to highlight the interpreted pegmatite dykes as "Red" zones, for easier interpretation.
Figure 2 illustrates the northern part of the surveyed area, around drill holes MAC 06 and 07, with the reverse-colored image from Figure 1 (Right Image) and overlain by topographic contours. It is clear from the contours where there are deep cirque valleys a couple of hundred metres deep the helicopter was not able to drape and follow the terrain, making the distance from ground to sensor greater and the image gets "washed" out with less detail. The interpreted LCT pegmatite dykes have been traced out with lines of white dots. They seem to get cut-off by the cirques, but we know from outcrop they persist in the cliff faces of the cirques. The apparent cut-off is due to loss of sensitivity due to the height above the ground. Signal drops off at the square of the distance. On the upper plateau, a swarm of anastomosing dykes can be perceived including the dyke that was sampled by MAC 06 and 07. Part of the summer field program plan is to expand on the intercepts in these holes using 50 m step outs. This magnetic data will aid in locating these collars.
Click Image To View Full SizeFigure 2 A zoomed in view of the NW part of the property, with the Bzz data, reverse colors, with 5 m topographic contours. The red linears are thought to map out the LCT pegmatite dykes. Note the swarm near historic drill holes MAC06 and MAC07, at which these drill holes only test one dyke in the swarm. The channel sample highlights are shown in Table 1, below.
In the past field crews sampled the exposed pegmatite outcrop in the faces of the cliffs that define the cirques, the cliff faces were given colloquial names after famous "walls." Table 1 lists the channel samples from the various cliff faces sampled. The small dykes sampled in Table 1 would not be able to be resolved in the magnetic data due to the small width, only the larger dykes and the combined swarms will show. Refer to Figure 2 for locations. The dyke swarm seems to continue in the magnetic data to the south past Cirque 6 in an unexplored part of the property. Figure 2 also illustrates an 80 m to 100m wide magnetic signature that traverses the entire data set for several kilometers. This anomaly has been named Alpha Prime. Several scout drill holes are planned to test these, this summer.
Table 1: Channel sample results
Cliff face name
Width (m)*1
Li2O (%)
Ta2O5 (g/t)
SnO2 (%)
Prison Wall
4.40
1.12
55.0
0.05
1.20
2.33
59.0
0.05
1.90
0.87
56.4
0.03
1.70
1.57
250.3
0.95
Berlin Wall
4.00
2.04
57.8
0.05
1.95
2.29
48.7
0.01
0.95
3.10
53.6
0.03
Great Wall of China
16.65
1.21
65.4
0.03
3.75
1.67
45
0.03
7.00
1.41
59.9
0.04
1.25
1.83
67.3
0.05
5.15
1.63
52.9
0.01
Hadrian's Wall
1.05
0.85
80.9
0.05
6.30
1.86
116.7
0.05
*1 - Measured widths are estimated to be 98 to 90% of the true thickness, due to the near vertical dip.
2006-2007 Soil sampling correspondence with the southern extent Alpha Prime pegmatite dyke
The concept that the Alpha Prime dyke, is part of the LCT pegmatite swarm, is supported by soil sampling undertaken in the south end of the property in 2006 and 2007. These soil surveys used two assay methods, one with Aqua Regia for a selected digest, and one using four-acid near total digest. Lithium was only assayed for in the near total digest. Figure 3 shows the results of this work. The trace of Alpha Prime has a strong (red circles) > 127 ppm Li-in-soil anomaly coincidence with it.
Click Image To View Full SizeFigure 3 SW portion of the QMAGT survey, colors changed (to pastel purple) to highlight the soil geo-chem results associated with the pegmatite swarm. The Alpha Prime dyke signature is prominent and named in the figure. Each dot represents a soil sample site, the dots have been colored by Li ppm results as shown in the legend.
Soil sampling seems to be an effective tool in this environment, and there are plans to expand this soil grid in key areas of interest, to follow Alpha Prime, and to define the dyke swarms on the plateau near Cirques 3 to 6.
Patrick Power, CEO of Lake Winn Resources Ltd said, "We took a bit of a risk with using the relatively new QMAGT system but as you can see it has proven worthy, this will greatly aid in our upcoming drill program. The more we work on this property the more it becomes apparent that we have a large system of LCT pegmatite dykes, our goal is to as quickly as possible narrow down the best zones in this system which stretches more than 7 kilometers. Our vision is to define circa 100mT of >1% LiO2 in the most rapid low-cost manner. This summer's work will be a big step towards making this a reality.
Lake Winn is currently in planning with our consultants, Archer, Cathro & Associates (1981) Limited, to scope, price, and plan a 3,000m drill program to commence in early August.
The technical information in this news release has been approved by Heather Burrell, P.Geo., a senior geologist with Archer, Cathro & Associates (1981) Limited and a qualified person for the purpose of National Instrument 43-101.
About Lake Winn
Lake Winn Resources Corp. is a mineral exploration company focused on advancing its 100% owned Little Nahanni Lithium Project ("LNLP"), which is located in the western Northwest Territories near the Yukon Border. The project covers 7,080 hectares that encompasses a 7 km long, and up to 500 m wide, lithium, tantalum, and tin pegmatite dyke swarm. Historical drilling and channel sampling on the Project confirms the presence of significant Lithium, Tantalum, Tin, and Cesium.
On Behalf of the Board of Directors of Lake Winn Resources Corp.
Patrick Power
CEO and Director
Telephone: (604) 218-8772
"Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release."
Copyright (c) 2023 TheNewswire - All rights reserved.