Project Stats


  • Metals of Interest: Gold
  • Location: Abitibi Greenstone Belt, Quebec
  • Surface Area: 21 mineral claims totaling 1,162.04 hectares

Project Overview

The Great Thunder Gold Corp. Northbound Property lies in the Abitibi Greenstone of Ontario and Quebec, one of series of gold bearing Archean Greenstone Belts of the Canadian Shield through Northern Quebec and Ontario. Important deposits with the northern Abitibi Belt include Detour Lake, Detour Lake 58 Zone, Casa Berardi and the Fenelon deposit of Wallbridge Gold Mining Ltd. The geology of the northern Abitibi Greenstone Belt is taken from Geological Survey of Canada Map D1860a.

Great Thunder has acquired a key piece of ground in the Abitibi, the Northbound property, contiguous to the north and west of the Wallbridge Fenelon ground.

Project Geology

The bedrock geology from the Quebec Ministry of Mines website. The Northbound claims are underlain by biotite granodiorite. The same intrusive extends well into the northern half of the Fenelon claim block. The southern half is underlain by dark green mafic volcanics and with intrusives, lighter green mafic volcanics and intrusives and pink undifferentiated tuffs with lesser mudstones and mafic volcanics. The Fenelon deposit appears to lie within the lighter green mafic volcanics and intrusives.

The key to Great Thunder is the continuing exploration at Fenelon tracing the gold zones well in the biotite granodiorite, the Jeremie Pluton. As the Fenelon exploration  continues to move deeper into the Jeremie pluton, the exploration moves closer to the Northbound property boundary, lying 3.5 kilometres to the northwest the overall direction of the trend.  Great Thunder cautions investors that mineralization on the Wallbridge Fenelon property is not necessarily indicative of similar mineralization on the Great Thunder Northbound property.

A recent Long Wave Infrared (LWIR) survey was completed over the Northbound Claim Block and surrounding area. LWIR utilizes the long wave infrared bands on the Aster Satellite to penetrate through vegetation into the top 30 to 60 centimetres of the earth’s surface. While the long wave data is readily available, the algorithms to process the data are proprietary. The survey measures the individual mineral reflectance spectroscopy of the various constituent minerals against known standards to highlight anomalies within the area surveyed.

Aster Satellite Characteristics

The Japanese Aster satellite has been remotely sensing the earth since 2000. VNIR/SWIR imagery samples the electromagnetic spectrum from 0.5 to 2.4 microns and senses the top millimeter of the earth’s surface at 30m spatial resolution. LWIR at 90m spatial samples from 8.3 to 11.3 microns and has additionally some penetration thanks to the emissivity property of minerals. All three spectral ranges produce images which are useful reconnaissance tools for mineral exploration.

LWIR Processing

Step one is to separate reflectance from emission effects in the imagery as these data were collected during daytime.

Sixteen spectral Endmembers are then derived for the image as it is assumed that each 90 x 90 m parcel of ground is a nonnegative linear combination of sixteen pure endmembers. Sixteen is an ad hoc number, chosen on the assumption that it is sufficient to explain the geological variability of the scene.

Each pixel is then expressed as a sum of sixteen spectral abundances, most of which will be zero as they are estimated in such a way as to produce a sparse representation of the nine dimensional data in sixteen dimensional space. Each Endmember hopefully corresponds to a geological meaningful unit and interpretation consists of the process of interpreting these Endmembers whose abundances appear in the plots. Each of these spectral abundances is associated with a corresponding spectral Endmember shown in the plots. To interpret these spectral endmembers, we compared them to an appropriately resampled spectral library from Johns Hopkins University, NASA and JPL. The closest matches in the Fenelon LWIR survey are:

  1. Talc
  2. Feldspar
  3. Feldspar
  4. Pyrite
  5. Pyrrhotite
  6. Pyroxene
  7. Rhyolite
  8. Chalcopyrite
  9. Flourite
  10. Water
  11. Tourmaline
  12. Orthoclase
  13. Gypsum
  14. Quartz
  15. Hematite
  16. Alunite

Since the Aster Data is downloaded in pre-set sheets, the survey actually covers a much larger area then the claims themselves. As such, it provided information on the surrounding ground, including the Wallbridge ground. In addition, since the survey determines the end members over the entire map sheet, large areas of each sheet are commonly benign. Therefore, only the maps with anomalous zones within or proximal to the Northbound claims are discussed below:

  1. Pyrite
  2. Pyrrhotite
  3. Rhyolite
  4. Tourmaline
  5. Chalcopyrite
  6. Quartz
  7. Hematite
  8. Alunite

The first plot to show anomalous zones within the Northbound – Wallbridge area is pyrite. Small pyrite anomalies lie proximal to the eastern and western boundaries of the Northbound claim block. There is no pyrite associated with the Fenelon deposit.

The pyrrhotite plot is extremely interesting. Pyrrhotite is the key mineral associated with the Fenelon deposit. The entire area surrounding the Northbound – Wallbridge blocks is anomalous in this mineral. The Fenelon deposit seems to lie on the eastern edge of a smaller pyrrhotite anomaly. A number of pyrrhotite anomalies lie elsewhere within the Wallbridge block.

The contact area of the biotite granodiorite appears to be mirrored by a pyrrhotite highs along the entire length shown in the map. A number of smaller anomalies lie within the Northbound claim block and will need to be investigated.

The rhyolite plot also seems to show the same ovoid anomalous zone associated with granodiorite contact. The Fenelon deposit is in the heart of a major anomaly, similar in appearance to the anomaly on the eastern side of the Northbound claim block.

The rhyolite also seems to show a north-south trending anomaly along the eastern edge of the Northbound claim block and then down through the centre of the Wallbridge block.

The tourmaline plot shows a similar north south trending anomaly to the rhyolite anomaly. Fenelon does not appear to have an associated tourmaline anomaly.

Importantly, there appear to be coincident pyrrhotite and tourmaline anomalies within the Northbound claim block. These need investigating as tourmaline can be a key mineral associated with these gold deposits.

This is one of the key plots from a Northbound claim block point of view. There is a nice bullseye chalcopyrite anomaly in the southeast section of the claim block that definitely needs to be examined. There are several anomalies both within and the west of the Northbound block that suggest a possible east-west trend.

The quartz plot appears to mirror the chalcopyrite plot, making it a very interesting target area. This definitely needs to be followed up.

The hematite plot is interesting for a couple of different reasons. First, the Fenelon deposit sits on a nice elongated bullseye hematite anomaly, with a similar looking anomaly in the southern portion of the Northbound claim block. Secondly, the Northbound hematite anomaly appears to be coincident with he quartz and chalcopyrite. The east-west trend seen in the quartz and chalcopyrite is also evident in the hematite.

While the anomalies on the alunite plot appear to be more subtle, the east west trend is also prevalent on this map. Alunite is a clay alteration mineral.

Summary of LWIR Survey Results

The objective of the LWIR survey was to identify zones of anomalous responses within the Northbound claim block. While the Fenelon deposit shows a rather muted response under the LWIR, at least one of the key minerals share similar responses at Fenelon and on the Northbound claim block.

The LWIR hematite responses show similar anomalies at Fenelon and in the southern part of the Northbound claim block:

The LWIR is suggesting an interesting multi-element area of anomalous responses in the southern portion of the Northbound claim block. The responses are seen in the chalcopyrite, quartz and to a lesser extent the alunite plots. These key mineral multi-element responses form a high priority target. The similar response in the pyrrhotite plot adds to the target potential.

The pyrrhotite and the tourmaline responses also appear to show coincidental major and lesser anomalies within the Northbound claim block as well.

In conclusion, while the Northbound claim block and the Walbridge block share a common hematite anomaly, there are strong coincidental chalcopyrite, quartz and alunite anomalies within the southern portion of the Northbound block. These multi-element anomalies represent a significant exploration target and need to be followed up.

A program to fully evaluate the coincidental multi-element LWIR anomalies on the Northbound Property claim block is required as follows:

  • A thorough review of historical exploration, concentrating within and adjacent to the present Northbound claim boundaries;
    • Mapping, rock, soil, stream sediment sampling, ground and airborne geophysics
  • Ground evaluation of the LWIR anomalies and areas of interest generated from the historical review;
  • Airborne magnetics directed at locating fault/shear zones and areas of magnetic lows;