Australia

TMG Tin (Mount Garnet Tin) Project

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Categories

Overview

Mine TypeOpen Pit
StageFeasibility
Commodities
  • Tin
  • Fluorine
  • Iron Ore
Mining Method
  • Truck & Shovel / Loader
Mine Life... Lock
ShapshotMount Garnet Tin project is now TMG Tin Project.

In 2013, the previous owner, Consolidated Tin Mines Limited, completed a Pre-Feasibility Study for the Mt Garnet Tin Project.

Tablelands Mining Group continued exploration of the Project.

Owners

SourceSource
CompanyInterestOwnership
Tablelands Mining Group 100 % Indirect
In 2021, the Consolidated Tin Mines Limited (now Aurora Metals Ltd.) sold the Project to privately held Tablelands Mining Group.

Deposit type

  • Skarn

Summary:

Mt Garnet Regional Geology
The Mount Garnet tin deposits are hosted in granite-intruded sediments with associated contact metamorphism and metasomatism.

The mineralisation including cassiterite, magnetite and fluorite, is contained within tabular skarn lenses that formed within carbonate-rich sediments.

The Silurian Chillagoe Formation, characterised by limestone – marble, chert, basic volcanics and siliciclastics, lies along the western margin of the Hodgkinson Province. Limestones of this formation are favourable hosts for skarn-associated tin mineralisation at Mount Garnet.

Gillian Geology
The Gillian tin deposit occurs as skarn lenses developed in altered limestone beds of the Chillagoe Formation which has been intruded by granites. The lenses are tin-iron skarns consisting of massive magnetite and goethite with fine grained cassiterite, the most common tin bearing mineral.

The deposit strikes north-south and has the dimensions 850 m north-south, 880 m east-west and 250 m vertically. In the western part of the deposit, mineralisation occurs as a number of steeply ipping tabular lenses, while mineralisation in the eastern part occurs, primarily, as a single lens.

Pinnacles Geology
The Pinnacles tin deposit occurs as a series of irregular skarn lenses developed in altered limestone beds of the Chillagoe Formation which has been intruded by granites. The deposit is a tin-fluorine-iron skarn consisting of thinly banded magnetite-fluorite, known as wrigglite, with fine grained cassiterite, the most common tin bearing mineral.

The deposit strikes north-south and has the dimensions 700m north-south, 500m east-west and 250m vertically. In the western part of the deposit, mineralisation occurs as a number of steeply dipping tabular lenses, while mineralisation in the eastern part occurs, primarily, as a single lens, see below.

The flat lying skarn occurs close to the surface and dips towards the centre of the deposit where it is up to 25m thick.

Windermere and Deadman’s Gully Geology
The Windermere tin deposit occurs as an irregular skarns pods developed in altered limestone beds of the Chillagoe Formation which has been intruded by granites. The deposit is a tin-iron skarn consisting of massive magnetite with fine grained cassiterite, the most common tin bearing mineral.

The Windermere deposit consists of a series of several, more or less vertically dipping, skarn pods striking more or less north-south. The deposit is known over a strike length of two kilometres. Drilling of the deposit has revealed that the mineralisation exists as ‘pods’ of various sizes. The larger intercepts seem not to extend along strike or down dip. The deposit does not seem to contain a clear contact zone of skarn formation resulting in the ‘pods’ referred to above. This makes it difficult to define a clear target across the 2 km strike length. A theory that the granite contact is deep (<150 m) and that the mineralising fluids have permeated through the host rocks to form the skarn pods has not been proven to date.

The geology of the Deadman’s Gully deposit, which lies on the same trend as Windermere about 750 m to the south, is similar to that of Windermere. Deadman’s Gully is smaller, being known over a strike length of about 100 m. The local geology is depicted below.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityProductUnitsAvg. AnnualLOM
Tin Metal in concentrate t 2,94426,495
Fluorine Concentrate kt 54485
Iron Ore Concentrate kt 2352,115

Production Costs

CommodityUnitsEstimated
Total cash costs Tin AUD 13,917 / t * **  AUD
Assumed price Fluorine AUD 400 / t *  AUD
Assumed price Tin AUD 24,000 / t *  AUD
Assumed price Iron Ore AUD 150 / t *  AUD
* According to 2013 study / presentation.
** Net of By-Product.

Operating Costs

Currency2023
OP mining costs ($/t milled) AUD 24.3 *  AUD
Processing costs ($/t milled) AUD  ....  Subscribe
Total operating costs ($/t milled) AUD  ....  Subscribe
* According to 2013 study.

Project Costs

MetricsUnitsLOM Total
Initial CapEx $M AUD  ......  Subscribe
Net revenue (LOM) $M AUD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscribe
Pre-tax NPV @ 8% $M AUD  ......  Subscribe
After-tax NPV @ 10% $M AUD  ......  Subscribe
After-tax NPV @ 8% $M AUD  ......  Subscribe
After-tax IRR, %  ......  Subscribe
After-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2023

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