Terramin Australia Limited · ASX:TZN
Terramin Australia — Corporate Update (March 2014)
22 slides from Terramin Australia's corporate update, March 2014
Slide 1: Australian Groundwater Technologies: making water work
Australian Groundwater Technologies “making water work”
Slide 2: Welcome Everybody
• Welcome Everybody • Terramin Team: – Martin Janes - CEO – Matt Daniel - Environment and Community Superintendent – Erin Nugent - Commercial Manager – Eric Whittaker - Principal Geologist – Ken McBride -Site Supervisor – Katy Fechner - Environmentalist • Australian Groundwater Technology: Specialis
Slide 3: Mining history and groundwater background
• Mining history in the area • Previous water studies and proposals • Water table characterised by a fractured rock aquifer – complex systems and typically difficult to distinguish. • Significant reliance on groundwater in area • Bores are generally ~100 m deep, with a few being 150 m deep. • Aside
Slide 4: Bores target the Brighton Limestone
Bores target the Brighton Limestone (marble), (contains the gold bearing qtz veins)
Slide 5: Key project issues and main focus for research
Key project issue and main focus for research: 1. Quantification of groundwater flows; 2. Groundwater interaction with surrounding aquifers and users; 3. Possible groundwater contamination from historic activities*; 4. Water management options; and 5. Compliance to Water Allocation Plan (WAP). *Prev
Slide 6: Groundwater investigation program stages
1. Desktop study (review of past studies / other information) (completed) 2. Ongoing collection of information from regional Stakeholders 3. Baseline studies - Groundwater monitoring (ongoing) - Bore census (ongoing) 4. Field investigations - Drilling of five investigation bores (4 completed) - Pump
Slide 7: Regulators and approvals for the works
Regulators for the works are DMITRE and DEWNR. DMITRE Approvals : • Construction of five investigation wells. (inc. earth works and water storage) • Pump testing of investigation wells. • Short duration – measures impact between holes • Risk assessment undertaken with focus on regional impact • Moni
Slide 8: Groundwater monitoring: depth to groundwater
• Groundwater monitoring of 11 site bores commenced in November is ongoing. • The groundwater monitoring network expanded off-site to include 12 additional private bores. • Groundwater level loggers installed in six site monitoring bores and two private bores identified for equipping. (next week) •
Slide 9: Project Area and bore census
Census is ongoing: • 25 properties surveyed. • 46 bores identified • Water samples collected from private bores, dams and creeks • 12 private bores are now being routinely monitored by Terramin. Project Area Australian Groundwater Technologies “making water work”
Slide 10: Little is known about aquifers beyond 125 m depth
Until now little is known about the aquifers beyond the depth of 125 m. This drilling program represents the: • First drilling investigation within the Inverbrackie Sub-Catchment. • Most comprehensive study in the Upper Onkaparinga Catchment (no investigation bores within 10 km). NB: A V-notch weir
Slide 11: Four investigation wells drilled and cased
• Four investigation wells drilled and cased at depths ranging from 135 m to 300 m. • Wells target all geological rock types (Considered separate aquifers DEWNR). • Designed to determine the connectivity between the marble and the adjacent aquifers.
Slide 12: Information collected during drilling
Information collected during drilling: • Aquifer yield with depth (to identify major water bearing horizons). • Groundwater salinity change with depth. • Fracturing with depth (broken ground). (results forDBIW05) Australian Groundwater Technologies “making water work”
Slide 13: Bore yield versus depth
Bore yield (L/s) 0 10 20 30 0 50 Private bore yields shown in blue Investigation bore yields DWIB1, DWIB3, DWIB4, DWIB5 100 Depth of old mine workings Fractured ground Bore Depth (m) 150 = high groundwater flows 200 Yield decrease with depth DWIB3 250 DWIB1 DWIB4 DWIB5 300 Brighton Limestone – Host
Slide 14: Information collected during drilling (continued)
Information collected during drilling (continued): • Geophysical logging • Acoustic televiewer • Mapping of fractures (water bearing zones) • Detection of thin beds • Determination of bedding dip Australian Groundwater Technologies “making water work”
Slide 15: Aquifer testing
Aquifer testing to determine the: • Aquifer parameters (permeability, flows and volumes) required to construct groundwater model. • Level of connection between each aquifer i.e. marble/sandstone/siltstone. • Interaction of faults and structures • Monitor groundwater drawdown – via site and surroundi
Slide 16: Airlifting water during drilling of DWIB1
Airlifting water during drilling of DWIB1 • BH41 (all units) • DWIB3 (Cox Sandstone) • BH37 (all units) • BHR01 (shallow water table) Australian Groundwater Technologies “making water work”
Slide 17: Pump testing plan
• Planned during winter – targeting period when minimal groundwater pumping is likely • Pumping rates are lower than first anticipated. (25l/s not 45l/s) • A risk assessment was completed to ensure private water access will not be impacted during pump test work. • Developed in consultation with DEWN
Slide 18: Groundwater model development
Data collected from baseline monitoring, drilling and bore testing will be used to develop a robust groundwater model. The model will be used as a tool to: • Predict groundwater inflows into the mine. • Assess potential impact to surrounding aquifer / bores. • Evaluate a range of water management op
Slide 19: Water management options
Too early to speculate what water management methods. The type of water management options will be dictated by the rate of potential inflows and the nature of the aquifers Groundwater modelling -> •assess feasibility of the project •determine a range of water management options Numerous methods and
Slide 20: Water management techniques developed in the last 100 years
Water management techniques developed in the last 100yrs Progressed from dewatering a region through pumping Management techniques range to suit application • Angas Zinc Mine (SA) – Managed aquifer recharge • Cosmo Gold Mine (NT) – Pre-grout from surface in fractured rock to stop inflows • Earnest H
Slide 21: Managed aquifer recharge examples
• Iluka (Balranald) -Trial Sturt) 2.3 GL/a. Several Operational • Santos – re-injection of CSG co-produced • Water Proofing the South (City of water - Trial Onkaparinga) 2 GL/a - Several in • Rio Tinto - Operational commissioning stage • Terramin – Angas Zinc Mine - Past • Oaklands Park Stormwater H
Slide 22: Contact details
Please ensure you provide contact detail for further updates, water quality information and water bore survey. Contact details: Joe Ranford – Terramin Australia ph: 8213 1415 bih@terramin.com.au Australian Groundwater Technologies “making water work”