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TERRAMIN AUSTRALIA Limited

TERRAMIN AUSTRALIA Limited. Angas Zinc Project. The Angas Zinc Project: noise. Noise issue is a “work in progress” Final noise outcomes and decisions awaiting final designs. These hinge on the Mining Lease and MARP approvals. Work on noise will be ongoing. Noise: What is it?.

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TERRAMIN AUSTRALIA Limited

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  1. TERRAMIN AUSTRALIA Limited Angas Zinc Project

  2. The Angas Zinc Project: noise • Noise issue is a “work in progress” • Final noise outcomes and decisions awaiting final designs. • These hinge on the Mining Lease and MARP approvals. • Work on noise will be ongoing.

  3. Noise: What is it? • Noise and sound • Made up of different components • Loudness (measured in decibels; dB(A)) • Frequency (or pitch)(measured in hertz; Hz) • Characteristics • Tone, fluctuation, impulsiveness

  4. Noise: legislative framework • Environment Protection (Industrial noise) Policy (INP) • Area of development adjacent to existing residences is “Urban residential with some manufacturing industry…” • Prescribed limit: 58 dB(A) (day), 50 dB(A) (night) • General duty of care under Environment Protection Act

  5. INP: penalties • Penalties are applied by the INP for tone, impulsiveness, fluctuation • Planning penalty: 5 dB(A) • Characteristic penalty: 5 dB(A) • Gives new maximum allowable limits: • Day 48 dB(A) • Night 40 dB(A)

  6. Noise: indicative measures • Boeing 747 140 dB • Jack hammer 120 dB • Lawn mower 100 dB • Garbage truck 80 dB • Normal conversation 60 dB • Background noise 40 dB • Whispering 30 dB

  7. Current noise studies • Noise monitoring at two sites (site office and rear of site) • 7 day period September 2005 • Average noise 50 dB during the day, 30-40 dB at night • Does not include quarry noise

  8. Current ambient noise

  9. Angas Zinc Project: potential issues • Variety of noise sources • Mine • Vent rise fan • Trucks • Mill • Crushing Plant • Front-end-loaders • Grinding Mill • Air blower and compressor • Pumps and stirrers

  10. Benchmarking • Visit to mines located in towns • Stawell • Underground vent rise fans • Use of topography • Kagara zinc • Use of sheds to minimise noise • Low noise blowers • Ballarat Gold • Approach to noise containment

  11. Angas Zinc Project: General mitigation • Sound mounds (bunds) • Use of natural topography as noise barrier • Vegetation visual screens • Enclosed sheds for plant • Mufflers on machinery • White noise generation on reversing sounds • Day time only operation for some plant and machinery • Day time truck delivery & despatch

  12. Mine: Current design initiatives • Twin underground vent rise fans. • Selection of “low noise” volvo trucks. • Deeper boxcut to contain vehicle noise. • Use of “white noise” reversing indicators. • Sound mounds around boxcut and roadways. • Underground noise not an issue.

  13. Mill Design • The design of mill is heavily influenced by environmental considerations • Final location still to be finalised, work in progress • Natural lie of land will be used to help attenuate sound • Mill forced out of pit, crusher to remain • Buildings positioned to minimise noise transmission • Engineering contract specifies noise performance criteria

  14. Mill Design • Buildings positioned to cut noise transmission

  15. Mine Design • Crushing on day shift only(cost $2-3 million)

  16. Mill: Current design initiatives • Crushing only on day shift (cost $2-3 million) • Sound attenuation on compressor • Roof & wall on SAG mill • Roof & walls on flotation circuit • Low noise air blower • Sound mounds • Capital allowance for more attenuation during commissioning

  17. Current quarry

  18. Current Quarry: Status • Monday 22nd May 2006 site audit • Volvo trucks • Loader • Crusher • Screens

  19. Noise modelling: Bassett Acoustic • Matthew Stead; National Manager Acoustics • Penrice Soda Products solids recovery • Holden Paint Shop noise • AWB Rain Bulk Stores • Penola Bypass • Noise modelling performed using SA EPA accepted models • Indicative- based on initial scenarios • Based on noise produced by mill, trucks & vent rise fan • Based on climate for region: typical worst case scenario winds

  20. Modelled noise: Daytime

  21. Modelled noise: Night time

  22. Noise modelling: Bassett Acoustic • New round of modelling underway using • current configuration of plant • based on noise provided by mill, selected trucks & underground suppliers • Still based on typical worst case scenario for winds

  23. Standards and Targets • Proposed allowable limits • 48 dB(A) Day time (7.00 am- 10.00 pm) • 40 dB(A) Night time (10.00 pm – 7.00 am) • Outcome is to prevent public nuisance impacts from noise emanating from the operating site • The monitoring points to be reviewed from time to time with the CCC • The plant will be designed to better these targets

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