Case study on Mt Chalmers for Traprock Mining Limited

Traprocks flagship Mount Chalmers Projects main prospect is the historical Mount Chalmers mine which still hosts substantial mineralization, In addition, there are a number of partially drilled prospects whose geological and mineral characteristics are similar to those of the nearby Mount Chalmers mine. These prospects, including the known resource at Woods Shaft, require further drilling. 

The Mount Chalmers deposit was discovered in 1860 and was initially worked for gold. In 1898 copper was located deeper in the lode system. The mine was in production until 1914, when copper prices fell. Wartime production resumed the operations in 1941 until 1943.

Mining resumed again in 1979 with Mount Morgan Limited mining the newly discovered West Lode.

Production ceased in 1982, due to closure of the Mount Morgan mine and low commodity prices.

The current tenement area held by Traprock has been tenured by multiple different explorers at any one time and this is the first time in 50 years that the whole field has been held by a single explorer.

The past exploration has left an open ended series of targets, requiring further exploration drilling, with the potential to increase the resource.

The targets that the Company will explore are:

Massive sulphide lenses or deeper stockworks below the Main Lode and West Lode,

Direct down dip extensions to the plunging Main and West Lodes,

Potential mineralisation along strike within the mine geology.

Mount Chalmers is a Volcanic Hosted Massive Sulphide (VHMS) deposit, which type of deposit generally form in clusters of between five and 40 individual events and also may form as stacked lenses on top of each other.

The Mount Chalmers VHMS deposit is situated in volcanic rocks (the Berserker Beds) of Permian age and are fault bounded in a graben rift 120km long and 15km wide.

Further targets have been identified in the larger project area, including the Woods Shaft (1km SW of Mount Chalmers and drilled by a previous explorer). Previous drilling results from Woods Shaft have been very encouraging. Drilling was from surface to 90 metres depth and the mineralisation encountered has not been closed off, remaining open below the drilled zone and to the north and east.

 

Challenges

  • This resource had significant drilling with large amounts of legacy data exists, from 1890s mine plans through to mining & drilling data from the 1980s.
  • Over 400 drill holes, collared on a local grid, with no spatial reference to a modern grid system needed to be digitised and geo-referenced to a modern grid.
  • Geology logs and Cross sections had to be digitised from old scanned reports
  • Current known resources needed to be expanded with targeted drilling.
  • New drill targets needed to be defined.

 

AI enhanced ore deposit model

AI enhanced ore deposit model

 

 

 

 

 

Solutions

Orefox met with the key stakeholders to learn about the project, and ensured OreFox were addressing their questions and concerns, and confirm they understand the services available.

OreFox then

  • Digitised all known data and created a geo-database
  • Geo-referenced all drill holes
  • Re-surveyed the mine, using original mine survey control points.
  • Captured the mine pit in 3D using Drone Photogrammetry
  • Used Prospector AI to generate new targets within the exploration permit area.
  • Used Hunter, Data Mining and Target AI to define targets and improve drilling success within the mine environment.

 

Outcomes

  • With all data digitised, Traprock were able to rapidly get the resources to JORC 2012 inferred status.
  • All data was now secure and backed up and searchable.
  • The deposit can now be visualised in modern geological software for the first time ever.
  • Several new drill targets were defined.

 

 

 

 

cr 6345 8 MT CHALMERS SURFACE GEOLOGY