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LEGEND REGIONAL HYDROGEOLOGY PLAN LOCATION MAP AUTHOR:
DATA SOURCE Location: F:\Jobs\715\J\MapInfo\617 Figures\617_Figure3.2.wor
Aquifer Type Local aquifers of general low productivity
Porous, extensive highly productive aquifers
Porous, extensive aquifers of low to moderate productivity
Fractured or fissured, extensive aquifers of low to moderate productivity
Fractured or fissured, extensive highly productive aquifers
40 0 40 80 Kilometres Figure 5-33 Regional aquifer type and productivity
LEGEND LOCATION OF EXISTING BORES LOCATION MAP AUTHOR:
DATA SOURCE Location: F:\Jobs\715\J\MapInfo\617 Figures\617b_Figure4.1.wor
40 0 40 80 Kilometres OPR01 Rail
DoW WIN Database (2008) & (2009)
Johnson and Commander 2006, Mid West Minerals
Province Groundwater Appriasal HG17
LEGEND'>Figure 5-34 Groundwater bores within the Study Area
Construction water supply investigations Following the Phase 1 groundwater supply investigations (Aquaterra, 2010b), Aquaterra identified 24
potentially high‐yielding groundwater resources located up to 50 km outside of the Proposal Area.
Three of the 24 potential resources have been selected for further investigation, aimed at meeting
the construction water demand for the areas 155 – 530 km east of the western boundary of the
Proposal Area; namely:
Area AET‐2, which stretches along 84km of the Pindabarn Creek between the 424 km point
and the Jack Hills Mine;
Areas AET‐6 to AET‐9, which extends along approximately 120 km of the Sanford River and
its tributaries; and
AET‐12, located between the 185 and 215 km point, and extending along approximately 34
km of the Greenough River.
The anticipated yield capacity of the three selected groundwater supply areas has been estimated
‘siting’ potential exploration targets within each area using existing 250K‐scale geological
and regional aeromagnetic maps to obtain a total number of potential production bores per
area, assuming an 80% success rate; and
multiplying the number of potential production bores by the estimated average sustainable
bore yield (Aquaterra, 2010b), which is based upon analysis of existing bore yield
information in these, and other similar, areas.
The total yield potential of groundwater supply areas AET‐2, AET‐6 to ‐9 and AET‐12 is estimated at
120 L/s, 160 L/s and 3 8L/s, respectively.
Eleven exploration targets located within the Proposal Area are proposed to be investigated in the
Phase 2 drilling programme. It is proposed that these exploration targets (listed in Table 5‐24) be
drilled and, if successful, test pumped, as they fall within or along the edges of the three selected
groundwater supply areas, and would therefore provide useful, preliminary hydrogeological
information on these areas.
Table 5‐24 Estimated yield potential of selected ‘alternative’ groundwater supply areas Groundwater Supply Area Estimated Number of Production Bores Average Sustainable Yield of Bore (L/s) Potential Capacity of Borefield (L/s) Associated Exploration Targets within Rail Alignment Description of Target Aquifer Systems AET-2
Unconsolidated to semi-consolidated
Quaternary alluvium with minor surficial
calcrete and underlying fractured
AET-7 to -9
Unconsolidated to semi-consolidated
Quaternary and Tertiary (palaeochannel)
alluvial material, underlain in places by
highly fractured bedrock. Saturated
surficial calcrete deposits in area AET-7.
AET-12 15 2.5
Unconsolidated Quaternary alluvium and
metamorphosed bedrock of the Tallering
TOTAL ~318 11
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It should be noted that these anticipated borefield yields are indicative only and are based on
available information, as well as Aquaterra’s experience in similar hydrogeological environments.
These total potential yields do not account for aquifer heterogeneity, boundaries, cumulative
drawdown impacts, etc. Exploration drilling and test pumping is required to determine the aquifer
boundaries and potential bore yields.
5.2.5 Contaminated Sites Historical land use throughout the area is predominantly broad scale agriculture and pastoralism,
which reduces the likelihood of contamination occurring within the Study Area. A preliminary search
of DEC’s contaminated sites register does not identify any known contaminated sites within the
Study Area (DEC, 2009b). The possibility that contaminants could be encountered during the
Proposal cannot, however, be discounted although the risk of such would be low and adequately
addressed through construction management procedures.
Unexploded Ordnance is known to be an issue in the Geraldton locality and the southern extremity
of the Rail Corridor traverses a known live firing target area. Although available information indicates
the likelihood of encountering Unexploded Ordnance is low, surveys will be undertaken in
accordance with advice from the Fire Emergency Services Authority of WA (FESA) prior to ground
disturbing activities within areas of potential risk.
5.3 SOCIAL SETTING 5.3.1 Population and Demographics In 2006, the population of the Mid‐West Region was 51,748 (Table 5‐25), with Geraldton’s
population of 35,022 equating to 67.7% of the total regional population (Mid West Development
Commission (MWDC), 2006).
Continued regional population growth is expected to be driven by resource development, although
to some extent it will merely compensate for losses in other sectors, such as farming and fishing,
which have declined significantly since 2000 (MWDC 2006).
Table 5‐25 Mid‐West population distribution 2006 (MWDC 2006) LGA 2006 Proportion of 2006 Population % Annual growth 2005 – 2006 (%) Average Annual Growth Rate 2000- 2005 (%) Chapman Valley
Other Mid-West LGAs
Mid-West (total) 51,748 100 3.5 0.5
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5.3.2 Industry and Employment In the coastal sector, agriculture and fishing are dominant, while further inland, mining and pastoral
activities dominate. In the financial year (FY) 2007, the Mid‐West economy delivered the third
greatest Gross Regional Product (GDP) per capita ($67,354) in WA, behind only the State’s two major
mining regions, the Pilbara and Goldfields/Esperance (Department of Local Government and Regional
Development (DLGRD), 2009).
Mining is the greatest contributor to the Mid‐West economy, generating approximately 50% of the
region’s GDP in 2007 (Economics Consulting Services, 2007). Cue, Mount Magnet and Yalgoo were a
focus of gold prospecting and mining in the late 1880s (MWDC, 2006) and a range of mineral‐related
activity, including mineral sands, gold, nickel, zinc‐copper, talc, lead, gypsum, lime sands, garnet and
iron ore, now occurs within the Mid‐West Region.
Although the Mid‐West Region encompasses almost one third of WA’s agricultural land (29.2%), the
region only produced 11.3% ($581.6 million) of the State’s total agricultural output in FY 2005.
The Mid‐West has dominated the State’s fishing industry for over a decade due largely to the
economically valuable rock lobster industry. Although mollusc and finfish catches were commercially
valuable leading up to FY 2005 (DLGRD, 2009), in the decade to the end of FY 2005, the rock lobster
industry consistently contributed over 80% of the combined value of production from the region’s
fisheries. In FY 2007, the Mid‐West fishing industry contributed 42.85% ($145.256 million) of the
combined catch value from all WA fisheries (DLGRD, 2009).
Although Agriculture and Fishery industries are important contributors to the regional economy,
between 2001 and 2006, their contribution to regional employment levels decreased by 18.6%
(Australian Bureau of Statistics, (ABS) 2001; ABS, 2006). Since the 2001 Census, this decline has been
offset by significant employment growth in the mining (183.7%), construction (135.9%) and transport
sectors (148.8%) (ABS, 2001; ABS, 2006). In 2006, the farming and agricultural sector was
proportionally the largest employer (26.0% of the total regional workforce), with education and
mining the next most significant employers in the region.