What's happening at Angas Zinc? Safety - In March achieved 12 - - PowerPoint PPT Presentation

TERRAMIN AUSTRALIA LIMITED

What's happening at Angas Zinc?

 Safety - In March achieved 12 months without a Lost Time Injury (LTI)  Emergency Response Training - new team members  Hazard reporting continued to increase  Increased core safety training

Highest recorded RL (72.34m)

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Mining and Processing (Quarter 1, 2013)

 Underground development has advanced to over 11km  Development progressing on the 360 metre level  A total 93,989 tonnes of ore was processed  10,827 tonnes of zinc concentrate  4,730 tonnes of lead copper concentrate  Exploration result from underground has resulted in approval of development of the 380mL

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Near Mine Exploration

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Regional Exploration

Results in March confirmed presence

• f a large copper-gold

mineralisation at Pipeline Ongoing geochemical sampling continues

• ver regional

prospects Regional exploration commenced in January

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Angas Zinc Mine

Quarterly Environment Report

Quarter 1: January -March 2013

• M. Daniel

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Environmental and Community Activities

 Annual Compliance Report (formally MARCR) submitted at requested date  Waste Management Plan - implemented, waste bays, recycling  Installation of noise curtains  TSF Rehabilitation trial (soil moisture probe vandalised, repaired in April)  Seed Collection - 9 species throughout the quarter  Rabbit fumigation  Woody Weeds eradication program  Community Interaction - Site tours

• CSIRO Double helix club
• SACOME Mining for non-miners
• SCCC and government regulators
• DMITRE Industry and Manufacturing

tour

• Green Triangle Activity Group
• TAFE SA Indigenous Students

studying mining – presentation and surface tour

 Sponsorships

• CLASS

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Noise March Monitoring - West results (Boxcut side)

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Noise March Monitoring -East results (Mill side)

Possible sledge hammer Wind Wind

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Noise

Noise/vibrations concerns from one resident.

• Ongoing regular discussions attempting to identify and resolve

these issue

• Analysis of noise and vibration data
• Consultant from a noise mitigation strategies company

(Flexshield) came to site in December 2012 measuring noise around and off-site to determine the main source of noise

Flexshield Noise Monitoring Locations

a Mine side of Grain Mill Paddock Residence Neighbour’s Home Boundary towards Neighbour 1st Level Ball Mill – 3000mm from Mill

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Noise - Flexshield Monitoring Data

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Noise/ Vibration

14

PPVmax- 0.10 mm/s

7/5/13 00:00 7/5/13 06:00

PPVmax- 0.12 mm/s

 Vibration Levels at time of Noise/vibration concern received on the 7th of May

• AS2187.2 Vibration limit - 5mm/s
• Walking - 1mm/s
• Jumping - 7mm/s
• Average vibration for a stope blast - 1.5mm/s
• Max during time (00:00 - 06:00) of concern - 0.12mm/s

 Noise data has been forwarded to the EPA

Velocity (mm/s)

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Hi-volume samplers

 Exceedance on the 4th of January over the PEPR criteria  SA Environmental Pollution Monitoring Services investigated the exceedance;

• Dust contained

low lead levels Wind speed 5-10 m/s

• Wind direction

(north to west)

• High levels not

recorded at western unit

• Non-mine related

dust

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Blasting

 No complaints regarding blasting during the quarter

 Monitors were calibrated during the quarter and replaced by the roving monitor  All monitors are now operational

• No data was recorded during the 25th and 28th of February and

the 5th to the 13th of March due to issues with the solar panel resulting in battery failure (roving monitor)

• Problem with the sensor at the Glover paddock monitor resulted

in invalid data from 31st of January till the 14th of March

• SAROS are currently installing an alarm system to raise an alert

when unusual data inputs occur

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Acid Mine Drainage - TSF Decant Pond RL

2010 2011 2012 2013

RL - 67.39 at 16th May

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Acid Mine Drainage - TSF Decant Pond Surface Area

 Surface area- now measuring weekly through visual inspection (photo and GPS points)  Current surface area - 11,807m2 at 67.45RL on the 15th of May  Below 15,000m2 and 68RL

7th March 2013 TSF Western Wall 15th 2013 May TSF Western Wall

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Acid Mine Drainage - Surface Area

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Acid Mine Drainage - TSF Decant Pond

 Beach survey undertaken on the 4th of May 2013  Volume of water in the decant pond has reduced by 219,727m3 since November 2011  RL of the tails has increased by 1 meter - at the decant chute  Water depth at decant chute reduced from 8.94m on 28th November 2011 to 2.12m on the 4th of May 2013

Date RL of Tails (m) Volume of Decant Pond Water (m3) Total Volume of tailings (m3) Nov-11

• 36.79

239,367 569,000 May-12

• 35.85

149,587 606,000 Oct-12

• 35.60

159,786 639,830 May-13

• 34.64

19,640 677,100

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Acid Mine Drainage - Modeled Surface Area

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Acid Mine Drainage - Management

• f the TSF Decant Pond

 Raw water management

• 350m3/day sent underground for use in the underground drill rigs
• Re-injection of filtered water
• Increased feed capacity of the filtration plant (replaced the

Osmoflo UF) which can treat 100m3/hr compared to 40m3/hr

• Dust suppression- sprinklers and water trucks
• RO plants - treating small amounts for internal use

 TSF water management

• Currently an average of 445m3/day of water is used within the

process plant

• Enhanced evaporation - sprinklers
• Paste fill
• V2 - contingency for high rainfall events

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Community feedback & environmental incidents

 3 registered community complaints

• Two from one resident regarding noise at night-

– noise curtains installed – house visit – noise monitoring conducted at the house

• Local resident complained about work conducted on Good Friday- did

not leave details  2 internal environmental events recorded

• Turtle found in process pond
• Oil spill identified on road verge adjacent to the eastern paddock

fenceline

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Upcoming Activities for Q2 2013

 Further weed and pest management  Vegetation maintenance and enhancement  TAFE group using Angas as a training site for rehabilitation

 Drainage and sediment drain upgrades  Continued removal of historic waste  Seeding of native plants on 6ha of the eastern paddock for SEB requirements  Rehabilitation of the historic landfill