Bird in Hand Gold Project - Update Draft Mining Lease Proposal - - PowerPoint PPT Presentation

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Bird in Hand Gold Project - Update Draft Mining Lease Proposal - - PowerPoint PPT Presentation

Sep 09, 2023 132 likes •437 views

Bird in Hand Gold Project - Update Draft Mining Lease Proposal provided to the Government on 20 th December 2017 Checks against Mining Act, and regulatory requirements (Ministerial Determination) Discussions continue on aspects of the

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SLIDE 1

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 1

Bird in Hand Gold Project - Update

 Draft Mining Lease Proposal provided to the Government on 20th December 2017

  • Checks against Mining Act, and regulatory requirements (Ministerial

Determination)

  • Discussions continue on aspects of the project with CCC, landholders,

local community and government

  • Things likely to change up to formal lodgement
  • When content is settled for the final MLP, we are planning to share the

contents with the CCC

  • This ensures that the MLA captures and responds to the issues raised

through the community and stakeholder engagement process.  Formal lodgement still planned for April 2018, subject to regulator feedback and MAR testwork

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SLIDE 2

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 2

Bird in Hand Gold Project - Update

Managed Aquifer Recharge trial

  • Discussion with Department of Environment, Water and

Natural Resources (DEWNR) and Department of the Premier and Cabinet (Minerals) – awaiting feedback

  • 2 - 4 reinjection wells and paired monitoring

piezometers proposed

  • No feedback received on proposed trial as yet
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SLIDE 3

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 3

Bird in Hand Gold Project - Update

EPBC Act Referral – Caladenia rigida

  • Optional – Company chose to refer Project
  • Meeting in Canberra last year advised potentially not

necessary based on outline of Project

  • Lodged in October 2017 to ensure managing potential

impacts appropriately

  • Can be downloaded from EPBC Act website for viewing
  • Awaiting feedback or decision from Federal

Government

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SLIDE 4

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 4

Bird in Hand Gold Project - Update

Corporate Reorganisation

  • Announced to ASX on 11th January 2018
  • CEO to transform into executive management of Australian

projects and exploration activities

  • Overall responsibility for Terramin’s corporate and finance

functions

  • More resources for Bird in Hand Gold Project
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SLIDE 5

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 5

Noise – Examples of Noise Abatement Angas Zinc Mine

 Angas Zinc Mine – Underground and processing – Strathalbyn

  • Landscape bunding / noise shielding
  • Infrastructure placed below ground level
  • Ventilation fan underground
  • Activities limited during night – no road trucking or crushing between 10pm-

7am

  • At night included – conveyor running, water treatment, ventilation,

underground trucks  Limits which reflected EPA noise policy “rural industry” – 57 dB(A) day / 50 dB(A) night

  • Leading indicator 47 dB(A) day / 40 dB(A) night

 Model recalibrated in 2012 against real data  Monitoring then undertaken at points and compared to model – Model verified  All complaints investigated and additional management undertaken if required

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SLIDE 6

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 6

Noise – Examples of Noise Abatement Angas Zinc Mine

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SLIDE 7

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 7

Noise – Examples of Noise Abatement Waihi Gold Mine NZ

 Waihi Gold Mine – New Zealand (open cut, underground + processing) – NZ

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SLIDE 8

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 8

 Waihi Gold Mine

  • Town of approx. 5000 – horticulture and dairy farming region
  • 2004: Underground commenced – 37km of drives, 360m deep
  • Employs 400
  • Includes ore brought to surface, crushed, 2.7km conveyor, and processing

plant

  • Construction noise limit – 75 dB(A)
  • Operating noise limit – 55 dB(A) day / 40 dB(A) night
  • Methods

– equipment selection and maintenance – construction and planting of noise bunds – cladding to reduce conveyor noise – limiting the height of stockpiles – acoustic cladding around potentially noisy machinery – closed board fencing – acoustic noise wall on some sections of perimeter noise bund.

Noise – Examples of Noise Abatement Waihi Gold Mine NZ

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SLIDE 9

TERRAMIN AUSTRALIA LIMITED

Blasting and Vibration

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SLIDE 10

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 10

2q

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SLIDE 11

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 11

Project Cycle

 After grouting cycle  Drill  Blast/Charge  Remove “bog/muck”  Insert ground support  Map geology  Check groundwater  Backfill

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SLIDE 12

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 12

Explosive pattern

 Twin boom drills on articulated carrier – Jumbo  ~60 holes per face  2.5m – 3.5m depth  45mm diameter  Twice over 24 hours

  • less than 30 seconds/day
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SLIDE 13

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 13

Explosive pattern

 Twin boom drills on articulated carrier – Jumbo  ~60 holes per face  2.5m – 3.5m depth  45mm diameter  Twice over 24 hours  Total blasting

  • less than 30 seconds/day
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SLIDE 14

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 14

Vibration and Air overpressure

When explosives detonate in rock, most of the energy is used in breaking and displacing the rockmass. However, some of energy is released in the form of ground vibration and air-overpressure. A soundwave from blasting is generated below the threshold of human hearing. We cannot hear it but we can feel it.

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SLIDE 15

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 15

Proposed Project Outcome

No public nuisance impacts from air-

  • verpressure and vibration caused by

blasting Proposal addition: “from the mining

  • peration”.
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SLIDE 16

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 16

Blasting Mitigation

Ground Vibration

Process of charging

  • Explosive quantity
  • Explosive type
  • Degree of Confinement

–Rock and space between explosive drillholes

  • Initiation timing

Air Overpressure

  • Explosive quantity
  • Explosive type
  • Initiation timing
  • Burden to free face

–Uncharged drillhole length

  • Number of holes
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SLIDE 17

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 17

Vibration - Context

Terramin commitment AS 2670.2–1990

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SLIDE 18

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 18

80.00 90.00 100.00 110.00 120.00 130.00 140.00 22/09/2017 2/10/2017 12/10/2017 22/10/2017 1/11/2017 11/11/2017 21/11/2017 1/12/2017 11/12/2017 21/12/2017 31/12/2017

dBL Quarter 4: 2017

dB(L) Compliance Proposed for 95% of blasts Compliance Proposed for absolute upper limit

Air Overpressure

 Background air-overpressure is currently peaking over 110-120 dBL  Data collected remotely by Saros (independent expert consultants in blasting)

731 instances above 115 dBL = 0.58% 212 instances above 120 dBL = 0.17%

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SLIDE 19

TERRAMIN AUSTRALIA LIMITED

SLIDE No. 19

Compliance Requirements

Australian blasting compliance limits AS 2670.2–1990 are amongst the most stringent in the world. Both ground vibration and air overpressure limits are based on human comfort criteria Terramin commits to:  Ground Vibration – Not to exceed 5mm/second for 95% of occasions, with an upper limit of 10mm/s  Air Overpressure – Not to exceed 115dBL for 95% of occasions, with an upper limit of 120dBL

  • Currently occurring 0.58% of the time.
  • At compliance limit (95% of the time), this increases to 0.61% for early

tunnel development

  • No overpressure expected once  300 m into tunnel
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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 20

Underground Development

0.5 1 2 5 10

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 21

0.5 1 2

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 22

0.5 1

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 23

0.5

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 24

0.5

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 25

0.5

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 26

Managed Aquifer Recharge - Update

 Met with DEWNR (Water Dept.) and DPC (Mining Dept.) in December  Waiting on feedback as to what testwork would be suitable to meet expectations  Trial will inform final design of Managed Aquifer Recharge network for

  • perations

 Trial will be between 2 and 4 reinjection wells and monitoring piezometers

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 27

Reinjection and Water Treatment Process

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 28

Reinjection and Water Treatment Process

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TERRAMIN AUSTRALIA LIMITED

SLIDE No. 29

Credible Worst Case Scenario Inflows How was it built?

Using the credible worst case scenario of a 70% effective grouting regime

  • A maximum peak inflow of 24l/s
  • The underground dewatering system has been designed on this

plus an additional 14l/s.

  • The additional 14l/s came from doubling of aquifer transmissivity
  • f the Tapley Hill formation (additional 7 l/s) and doubling of the

vertical and horizontal conductivity of the hanging wall fracture zone (additional 7 l/s) This equates to a total inflow of 38l/s, rounded to 40l/s for ease of design.