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Australia
Granville Project

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 Location:
5 km WN from Zeehan, Tasmania, Australia

  Project Contacts:
Level 27, 111 Eagle Street
Brisbane
Queensland, Australia
4000
Phone  ...  Subscription required
Fax+61-0-3303-0681
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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Tin
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Spiral concentrator / separator
  • Shaker table
  • Centrifugal Jig
  • Flotation
  • Magnetic separation
Mine Life2 years (as of Jan 1, 2017)
The Granville Tin Project (Granville) is a high tin grade project Aus Tin Mining Ltd. acquired on a care & maintenance basis in 2016. The Company sought and obtained approval in June 2017 to expand the operation from Level 1 (approximately 2,500 tonnes per annum) to Level 2 (40,000 tonnes per annum).

The Granville Project remains under care and maintenance. The tin price recently recorded its highest price in USD terms for more than 10 years, and the expectation is that this strengthening price will encourage more interest in the Project.
Latest NewsAus Tin Mining commences sale of Granville     April 23, 2020


Owners

Source: p. 59
CompanyInterestOwnership
Aus Tin Mining Ltd. 100 % Indirect
Aus Tin Mining Ltd. owns a 100 percent interest in Ten Star Mining Pty Ltd (TSM) which in turn owns the Granville Tin Project.

Deposit Type

  • Skarn


Summary:

The deposit is hosted in metamorphosed Neo- Proterazoic black carbonaceous shale and calcareous quartzite of the Oonah formation overlaid by Tertiary conglomerate, gravel and grit and subsequent Quaternary stream alluvium and swamp and marsh deposits. Mineralization occurs in the horizon of scarts with a magnetite strip associated with the layers, and tin is found as a supergene at a late stage, a low-temperature formation, that is, post-dating of skarn formation, and also (in the form of silicate) released during serpentinization. The horizon of the mineralized skarn extends approximately 50 meters long (north-south) and 15 meters wide (east-west).


Mining Methods

  • Truck & Shovel / Loader


Summary:

The current pit crest dimensions are approximately 125 m long (60 m at base of pit), 45 m to 50 m (25 m to 30 m at base) wide at its maximum and 20 m deep. The proposed expansion will increase the length of the pit base to 90 m with no effective increase in pit width at the base. The footprint at the crest is expected to increase to about 180 m in length and 110 m wide, disrupting approximately 0.5ha of relatively undisturbed vegetation in the process. The final pit depth will be nominally 40 m from the crest of the footwall shale (western slope) and 60 m from the crest of the hanging-wall (eastern side). Based on the current pit slope performance, the western pit wall will follow the footwall shale down to final pit depth as a single height highwall.

Based on the geometry of the final pit, it is proposed that the expansion will occur as a single cutback to the final pit void to allow adequate room for equipment to safely operate during mining. This cutback will be taken from the eastern and southern extent of the pit, retreating from the south towards the north for each cut. Depending on ore supply a shallow drop cut may be taken initially to ensure constant feed for the plant.

A nominal ramp grade of 1V to 6.5H (15 percent) will be adopted for design, so for a pit depth of 35 m, assuming a 5 m deep goodbye cut, the ramp will need to have a horizontal length of approximately 230 m. A minimum ramp width of 11.5 m will be allowed based on 2.5 x the width of the largest vehicle (40t Moxy) with allowance for a safety berm that is half the height of the largest vehicle tyre.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Mobile cone crusher 2
Mobile jaw crusher 1
Ball mill 1
Regrind

Summary:

Ore will be crushed at GEM to 6mm (P80) and stored on a new ROM / crushing pad with a capacity of up to 22,000 tonnes. During construction of the new ROM/crushing pad, measures will be implemented to reduce the likelihood of erosion and/or sedimentation, and will include an expansion of the existing sediment retention ponds and pre-treatment basin and diversion of surface water run-off from around the proposed ROM/Crusher pad and proposed WRE. Mobile crushing equipment will be employed on a campaign basis to crush 15,000 to 20,000 tonnes at a time, operating up to six days per week, 12 hours per day. Crushing equipment is anticipated to include one primary jaw crusher, two secondary/tertiary cone crushers and two vibrating screen decks.


Processing

  • Gravity separation
  • Spiral concentrator / separator
  • Shaker table
  • Centrifugal Jig
  • Flotation
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The Granville Processing Plant (GPP) currently comprises of comminution (ball mill), gravity and magnetic separation, flotation and tabling. The existing Level 1 user rights entitle the Proponent to extract up to 5,000m3 per annum of rock and gravel and crush, grind and process no more than 1,000m3 per annum of rock, ore and minerals. A series of water structures are in place to provide water for the existing activities.

The Granville Expansion will comprise the resumption of mining from the existing open cut (the Granville East Mine or GEM) of up to 40,000 tonnes of ore and 145,000 tonnes of waste material to provide stable geotechnical conditions. Waste rock from the extended open pit will be classified as Non Acid Forming (NAF) or Potentially Acid Forming (PAF) and stored in a new waste rock emplacement (WRE) east of the pit. Ore will be crushed at GEM and transported to the Granville Process Plant (GPP) approximately 8km from the mine along the Heemskirk Road. Ore will b ........


Projected Production:

CommodityUnitsLOM
Tin kt 0.8
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics
Daily milling rate 160 t *
Stripping / waste ratio 4 *
Waste tonnes, LOM 145,000 t *
Ore tonnes mined, LOM 40,000 t *
Annual milling capacity 40,000 t *
Annual ore mining rate 26,667 t *
* According to 2016 study.

Reserves at :



Proposed Heavy Mobile Equipment as of December 21, 2016:
HME TypeModelSizeQuantityLeased or
Contractor
Bulldozer ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
Annual Report 2018
Environmental Assessment 2017
Technical Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Aus Tin Mining commences sale of Granville April 23, 2020
Aus Tin looks on the bright side of mine disruptions September 24, 2019
Aus Tin commences owner mining at Granville after ‘frustrating’ delays March 14, 2019
Aus Tin mines first ore block at Granville following mine expansion February 19, 2019

Aerial view:

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