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Long Lake Project - Gold-Copper-Nickel-PGM, Sudbury, Canada

Exploration Target blind Sudbury “Offset Dyke” style massive Ni – Cu – PGM type deposits

Rumble Resources Ltd has an option agreement to acquire up to 100% of the Long Lake Project. The Long Lake Project comprises of the historic Long Lake Au mine and over four km of Sudbury breccia/quartz diorite outcrops which are interpreted to be part of the prospective “Copper Cliff Offset Dyke” system that has been moved west by later regional faults.  The area of tenure is approximately 19 km².

                                                                          Image1: Location of Long Lake Project

Overview of Sudbury Mining Camp, Ontario Canada 

Since 1883, the Sudbury mining field has been globally significant with the Sudbury Basin the second-largest supplier of nickel ore in the world, and new discoveries continuing to be made. It is one of the most productive nickel-mining fields in the world with over 1.7 billion tonnes of past production, reserves and resources.

Nickel-copper and platinum group metals (“PGM”) bearing sulphide minerals occur in a 60 km by 27 km elliptical igneous body called the Sudbury Igneous Complex (“SIC”). The current model infers the SIC was formed some 1,844 million years ago after sheet-like flash/impact melting of nickel and copper bearing rocks by a meteorite impact. The SIC is within a basin like structure (Sudbury Basin) which had been covered by later sediments and has subsequently been eroded to the current level.  Mineralization occurs within the SIC as well as in the neighbouring country rocks in close association with breccias and so-called ‘Offset Dykes’. Offset Dykes with metamorphosed (hot) Sudbury breccias have become the target of progressively more intense exploration interest in recent years following the discovery of blind economic deposits. Offset dykes are typically quartz-diorite in composition and extend both radially away from and concentric to the SIC. It is important to note that the Offset Dykes developed downwards from the impact melt sheet. Melt material migrated down into the fractures caused by the impact below the SIC. The melt carried metal sulphides that accumulated into deposits within the Offset Dykes by gravity and pressure gradients (impact rebound). Nearly half of the nickel ore at Sudbury occurs in breccias and Offset Dykes in the footwall rocks of the SIC.

                       Image 2 – The location of the Long Lake Project and the Deposit Types of the Sudbury Basin.

The Copper Cliff Offset Dyke System (Images 2 - 4)

The Copper Cliff South (producing) and the Copper Cliff North mine have yielded some 200 million tonnes of ore along the north-south trending offset dyke system. Vale Limited’s Clarabelle mill, Copper Cliff smelter and Copper Cliff nickel refinery are all located close to the Copper Cliff Offset dyke.

The southernmost deposit discovered to date is at Kelly Lake which lies south of the Copper Cliff South mine (see image 2 and 4). The Kelly Lake reserve is 10.5 Mt @ 1.77% Ni, 1.34% Cu and 3.6 g/t PGM. Note that IGO’s Nova – Bollinger Deposit which lies in the Albany Fraser Province of Western Australia has a reserve of 13.3 Mt @ 2.06% Ni and 0.83% Cu (2017).

The Long Lake Project (see images 2 and 4) lies some 10km southwest of the Kelly Lake deposit.

 

Image 3. Offset Dyke Deposit Examples of the Sudbury Basin

Nickel – Copper – PGM Potential

Exploration by previous explorers (including the current owner – Gordon Salo) has highlighted the occurrence of north-south and northwest striking Sudbury Breccia style dykes with quartz diorite. Petrography and a single shallow diamond drill-hole (82m depth - 2011) has confirmed the presence of moderately metamorphosed Sudbury Breccia with elevated PGM (relative to the surrounding rocks) at a location called Anomaly 19 (see image 4). The location is coincident with a moderate VTEM conductor. Reconnaissance prospecting and petrography has confirmed the presence of numerous quartz diorite north trending dykes over 4km in strike.

Electromagnetic surveys have been limited to VLF (1987) and VTEM (2008). Technical review of both surveys suggests the likely depth penetration for these systems is shallow at approximately 100m. Given there is a moderate VTEM conductor at Anomaly 19 (not explained), the use of high power ground TEM will be Rumbles priority in generating deeper conductive targets.

Image 4. Location of the Long Lake Project - Highlighting the Copper Cliff Offset Dyke and the Inferred Sudbury Breccia Dyke within the Long Lake Project.

Gold Potential

  • The Long Lake Gold Mine produced 57,000 ounces of gold from over 200,000 tonnes of ore mined in the periods 1910-1916 and 1932-1939. The average recovered mill grade was 9 g/t Au.
  • Long Lake historically was the largest gold mine in Ontario
  • Mine tailing dumps (200,000 tonnes) remain on site
  • The Long Lake gold deposit is a quartz – sulphide composite vein pipelike system hosted in quartzite with dolerite/gabbroic intrusions. The mineralisation was truncated by a low angle fault. Drilling in 1936 encountered high grade ore in unexploited areas beneath the fault which included intersections of 6m @ 13.8g/t Au with further drilling in 1970s intersecting 5.7m grading 27.5g/t Au & 1980s drill hole intersecting: 4.1m grading 14.8g/t Au.
  • Exploration from 2010 to 2012 focused on interpreted fault extensions and EM targets generated by a VTEM survey (2008).  A number of targets were tested. The best intercept was 35m @ 2 g/t Au from 27m, which was located only 15m from the historic open cut.

                                  Image 5 – The Long Lake Gold Mine historically was the largest gold mine in Ontario

Rumble Exploration Strategy

Rumble considers the Long Lake very prospective for high grade Ni – Cu deposits

No deep penetrating ground TEM has been conducted over the main targets of interest which include:

Long Lake Project

  • North-south and northwest trending Sudbury breccia/quartz diorite outcrops which have been interpreted as “offset dykes”.
  • Target blind Sudbury “Offset Dyke” style massive Ni – Cu – PGM type deposits by using high power ground TEM to generate potential conductors

 

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