500000mE 550000mE 600000mE 650000mE

MINERAL RESOURCES TASMANIA INNER SISTER The ISLAND Elbow

Tasmania SISTERS PASSAGEStanley Point DEPARTMENT of INFRASTRUCTURE Holloway Pt ENERGY and RESOURCES

5600000mN 5600000mN Blyth Point NORTHEAST TASMANIA 100 GROUNDWATER QUALITY MAP 100

100

200 MT KILLIECRANKIE

100

Killiecrankie Bay 100 Killiecrankie This map is complimentary to the main 1: 250 000 NE groundwater map. There is usually a degree of vertical stratification in the groundwater quality within the aquifers and results presented represent a composite value of salinity from drill holes at a particular time. Natural groundwater quality is influenced by annual rainfall and the evaporation (e.g. high rainfall, low evaporation areas tend to have better quality groundwater then low rainfall, high evaporation areas), the composition of the rock types through which the groundwater passes and is stored in and by physical properties of the rocks such as permeability and porosity. Human activities such as extensive groundwater pumping, pollution from various waste disposal activities and use of chemicals (agriculture, forestry, industry etc.) also may have negative effects on 100

groundwater quality. 100 Cape Frankland MT 100 SALINITY TANNER PROSPECTIVITY NUMBER RANGE VULNERABILITY TO POLLUTION AQUIFER TYPE (Whole of Tasmania) ROCK GROUPS GROUNDWATER QUALITY COMMENTS OF BORES (mg/L) 100 200 100 POROUS Quaternary aeolian deposits marginal to the coast consisting of fine to 5 Quality is often good enough for the water to be used for a wide range of purposes. High. (INTERGRANULAR) HIGH medium grain size sand. 100 101 Quality is variable but the groundwater can often be used for a wide range of purposes. Most analyses are towards the lower part of the salinity range (average Moderate to high. POROUS Quaternary coastal plain deposits consisting of sand, clayey sand, and 57 - 2550 MODERATE - gravel, occurring on low lying areas near the coast. Depending on whether low permeability material overlies the (INTERGRANULAR) of analyses about 650 mg/L). A small area of extreme salinity of up to 27,145 mg/L occurs at Cape Portland in a low lying area with low permeability material. HIGH Probable marine origin. Acidic water occurs at some locations, for example Lady Barron on Flinders Island. aquifer. 100 Red Bluff BABEL ISLAND Quaternary, alluvium and talus deposits. 25 2160 Water quality in the coarse grained alluvial sediments is often good as the deposits are usually near to surface streams and may be directly recharged by them. Low to high. POROUS LOW - The alluvium usually consists of clay, together with sand and gravel deposits The one analysis undertaken is in the upper range of salinity for this unit on a Statewide basis. Clayey material at the surface will aid in protecting groundwater at MARSHALL 100 (INTERGRANULAR) MODERATE with varying clay content. depth including underlying aquifers. Coarse-grained aquifers FLINDERS The talus consists of boulders and usually has a moderate to high clay without such protection are vulnerable as are aquifers underlying these materials. content. 100 Sellars Pt Minor windblown sand on sloping bedrock. BAY Terrestrial origin.

POROUS Tertiary sediments consisting of clay, sand and gravel of non marine origin 452 28 - 2160 Quality is variable but the water is often suitable for a wide range of uses including domestic and irrigation. Quality is usually poor in the Tamar area and in Low to high. (INTERGRANULAR) LOW - HIGH (lacustrine and alluvial deposits) ranging from small thicknesses up to shallow perched water table aquifers in low rainfall areas. In the northeast part of the sheet nearly half of the analyses have low pH values and this water is Low where thick clay layers cover aquifers (e.g. Longford area). several hundred metres. potentially corrosive to metals. High where gravel aquifers reach or almost reach the surface (e.g. 100 (Moderate - High on this map) Waterhouse). Triassic sandstone (lithic and quartz), mudstone, minor coal, terrestrial origin. Quality is variable but the water is usually suitable for a wide range of uses. The higher salinity values are often present in low rainfall areas or in an aquifer High. FRACTURED ROCK with low permeability and limited recharge. A layer of low permeability material at the surface will offer some Settlement Pt (Intergranular on Permian mudstone, siltstone, sandstone (often pebbly), minor limestone and HIGH protection and vulnerability may be reduced to low to moderate. 200 some horizons) conglomerate, tillite. Permian is mainly of marine origin with small zones of

terrestrial origin. 279 97 - 6800 300 300 200 Ordovician to Devonian turbidite sequence of sandstone and mudstone Salinity is commonly low which allows the water to be used for a wide range of purposes. The Mathinna Supergroup rocks around Bridport and some other High. PRIME Spit Point 100 MODERATE- (Mathinna Supergroup). near-coastal regions contain more saline water. A thick layer of low permeability material covering the aquifer will FRACTURED ROCK 300 HIGH reduce vulnerability. SEAL ARTHUR Ordovician, Cambrian and Precambrian limestone, siltstone, slate, ISLAND (High on this map) sandstone, quartzite and conglomerate. 344 64 - 3330 BAY Tertiary basalt. 557 45 - 2760 Quality of groundwater is usually good and a wide range of uses is usually possible. In lower rainfall areas salinity may increase and use becomes more High. restricted. Occasional bore waters have low pH (i.e. acid water). Deep clay soil developed on the basalt or clay sediments of Tertiary FRACTURED ROCK HIGH age (e.g. Westbury area) would offer some protection. 200 MT LEVENTHORPE 100 Jurassic dolerite. 146 85 - 1470 Quality is variable but is seldom saline enough in this region to limit use markedly. Moderate. Triassic basalt - St Marys. Can be high if highly fractured zones are not covered by low Long Pt FRACTURED ROCK MODERATE ISLAND200 Tertiary basalt - Scottsdale, Ringarooma, Tamar. permeability material. 300 Whitemark

Devonian granite and porphyrites. 60 240 - 1950 Quality is variable and sometimes the water is a little saline for many uses. Groundwater associated with the granitic rocks tends to have low pH values Low to moderate. 100 which could be corrosive to metals. Can be higher if localised highly fractured zones are not covered FRACTURED ROCK LOW - Cambrian serpentinite and dolerite dykes. MODERATE by a layer of lower permeability material.

1. Statistics provided in the legend are based on deep boreholes entered in MRT groundwater database (BORIS) by February 2003. Boreholes shown on the map are those with locations mainly supplied by drillers and from location in the field by MRT staff. PARRYS 2. There are many spear bores installed for investigation and production purposes in coastal sand deposits in Tasmania. Salinity ranges for some of the Quaternary aquifers have been obtained from these borehole records and included in the legend (marked with a star ). 3. Small elevated areas of any hydrogeological unit will usually have lower prospectivity because of limited storage and high drainage rates. 4. In areas where there is little or no water bore data, the groundwater prospectivity has been assumed to be similar to that in areas where data are widely available. 5. The northeast part of Tasmania covered by this map includes some areas that have low rainfall / high evaporation rates. As a result it contains portions of the state that are subject to soil salinity problems. Low rainfall / high evaporation is also probably the cause of the relatively poor quality of groundwater at some locations in the region. EAST KANGAROO BIG ISLAND GREEN BAY ISLAND T 100 400HE 500 P 5550000mN E 5550000mN A MEAN ANNUAL RAINFALL K STRZELECKI S

PEAKS600 O F POT BOIL POINT F Lady L Trousers Pt I LOCATION DIAGRAM N Barron D E Adelaide 500 RS 200 Bay 300

300 Ross Pt

NORTHWEST NORTHEAST VANSITTART CHAPPELL ISLAND ISLANDS

Puncheon Point SOUND ANDERSON ISLANDS James Pt FRANKLIN

DEEP BAY SOUTHWEST SOUTHEAST 100

MT

100 400 MUNRO 500 200 600

300 200 200 400 100 Harleys Pt 300 CAPE BARREN The rainfall map shows the mean annual rainfall over Tasmania for the standard 30-year period from 1961 to 1990. It was derived by the Climate and Consultancy Section in the Tasmania and Antarctica Regional 200 Office of the Bureau of Meteorology, from a gridded analysis prepared by the Bureau’s National Climate 200 Salinity contours of deeper Tertiary Aquifers Centre. The analysis system blends measured rainfall with topography to give estimates of rainfall for each area. The results will be less accurate in mountainous or data-sparse regions, and may differ 1500 (500 mg/L contour interval) from the observations at individual locations. ISLAND Longford Area (Geological Bulletin 59) CAPE SIR JOHN

200 200 100 MT 300 While every care has been taken in the preparation of this data, 400 100 KERFORD CAPE BARREN no warranty is given as to the correctness of the information and Kent Bay 200 no liability is accepted for any statement or opinion or for any

error or omission. No reader should act or fail to act on the basis 100 of any material contained herein. Readers should consult professional Wombat Pt advisers. As a result the Crown in Right of the State of Tasmania Jamiesons Point and its employees, contractors and agents expressly disclaim all and PRESERVATION any liability (including all liability from or attributable to any ISLAND CHANNEL Seal Pt negligent or wrongful act or omission) to any persons whatsoever in respect of anything done or omitted to be done by any such person in reliance whether in whole or in part upon any of the material in this data. Cone Point Crown copyright reserved. ARMSTRONG FORSYTH ISLAND PASSAGE 100 ISLAND CLARKE ISLAND Black Pt Spike Bay 100

Lookout Head

Moriarty Pt

5500000mN 5500000mN

Lighthouse Pt

CAPE PORTLAND SWAN ISLAND

Petal Point

B A S S S T R A I T Waterhouse Is. GREAT MUSSELROE BAY

WATERHOUSE POINT Musselroe Pt 100

RINGAROOMA BAY Croppies Point Cape Naturaliste

Tomahawk Stumpys Bay

100 Boulder Point

East Sandy Pt West Sandy Point ANDERSON BAY 200

RIVER

100 Gladstone 100 Stony Head Black Rock Pt Noland Bay 200 MOUNT 400CAMERON300 100 RIVER Eddystone Point 100 400 Bridport 200 100 100 100 200 Five Mile Bluff Weymouth

100 100 100

100

200 BOOBYALLA 100 100

RIVER 100 100 300 Low Head 300

West Head BRID 200 400 600 200 Policemans Point 200 500 PORT MOUNT 200 Greens 100 HORROR 100 RIVER

Beach 100 100 100 200 100 Badger Head GEORGE TOWN Lefroy Pipers River 200 5450000mN RIVER 5450000mN 100 100 Winnaleah Herrick 100 RINGAROOMA 200

Point Sorell 100 200

RIVER

400 200 200 Clarence Pt 100

300 D 300 PIPERS A 200 BAY 200 L 200 100 R 100 Y M E PL 200 BEAUTY 200 300 700 300 Derby 600 PORT OF 100 200 POINT 200 100 SCOTTSDALE 500 200 ANSONS MUSSELROE 300 400 200 200

300 400 MOUNT Branxholm 300 100 100 200 400 200 SORELL Lebrina 200 STRONACH Rowella FIRES

500 200 500 Beaconsfield 200 300 600 300 300 GREAT

100 DAZZLER 300 400 200 Weldborough 200 TIER 100 200 200 200 200 100 300 600 700 BLUE 100 300 200 FORESTER 300 Sidmouth DISMAL 100 Legerwood RIVER 400 400

600 200 300 200 200 200 700 200 RANGE 300 300 RANGE 500 800 600 Ringarooma 200 RATTLER Binalong Bay 100 Lilydale 500 500 200 100 300

200 RIVER 100 Grants Pt RUBICON GREAT 200 700 400 200 200 800 400 100 RANGE 200 200 1100 100 300 900 RIVER 100 9001000 100 400 400 400 St Helens Point

400 900 MT Pyengana

400 300 800 600 700 600 Exeter SCOTT 400 200 200 500 400 800 100 400 600 MT 1000 300 100 100 MAURICE RIVER 500 100 200 600 400 GEORGE 200 EAGLEHAWK 600 700 300 600 Georges MT TAMAR 100 200 Bay 200 500 MT 200 300 100 CARELESS RINGAROOMA600 VICTORIA 100 700 400 900 Frankford 400 1100 St Helens RIVER 1000 400 400 100200 200 200 900 600 200 200 200 400 200 500 100 300 TIER 900 300 400 900 300 700 St Helens Island

Legana 700 300 200

400 200 300 400 300 400 900 800 200 MOUNT 1300 700 300 700

1000 BARROW 800 800 600 700 SCAMANDER 300 Dianas Basin 500 1200 200 400 1100 300 600 200 700 MT 400 1300 300 300 300 800 900 Nunamara SADDLEBACK 800 500 500

1100

900

400 1000 300 800 1000 1100 100 1200 BEN NEVIS

300 St 700 400 200 300 Beaumaris 100

300 600 500 600 600 900 200 400 GRASS 200 400 Y Patricks 500 700 H 200 900 RIVER 300 400 300 U 200 T 500 Shelly Pt

T 800 I E 500 300 400 R 400 LAUNCESTON 400 SOUTH 500 SOUTH

River 100

Elizabeth Town 300 400 Scamander 800 Mathinna ESK 100 300 200 300 300 300 NORTH 100 RIVER 500 600

300 0 RIVER 200 ESK RIVER

400 900 200 300 400 200 600 300 Blessington 600 300 Henderson Pt ESK 500

200 500 1100 200 600 600 DELORAINE 1500 WESTBURY 100 Carrick 600 300 1400 400 400 300 1000 600 700

RIVER BEN LOMOND

200

300 200 900 800 200 500 500 1300 700

5400000mN 700 800 600 600 5400000mN 2000 500 1000 1500 1200 200 1100 500 2500 400 Burial Pt 300 Evandale

3000 RIVER 300Cornwall

1300

4000 400

4500 700 900

5000 6500

6000 500

PERTH 5500 400 300 800 1200 7000 300 St Marys 100 MACQUARIE

300 LONGFORD RIVER 2000 O’DAY 200 500 700

300 2500

1500 3500 900 Deddington 900 700 400 1000

400 3000 500 400 BREAK 200 NILE

500 400

800 500 600 Wardlaws Pt 700 2500 500

700 400 300 500 2000 600 1400 400 800 800

600 200 1500 700 500 700

MEANDER 600 Bracknell 500 700

1000 Fingal

800

1000 300 Meander 900 200 RIVER QUAMBY1100 BLUFF South 1000 800 800

400 RIVER TIER

RIVER 500 200 Rossarden 700 1500 1500 MOTHER 600 500 1100 700 500 600 CUMMINGS 500 800

400 700 700 600

PEAK 1500 500 2000 700 600 ESK

700 Cressy 400

700 Esk 3000 LIFFEY 600 DRYS Piccaninny Point

1100BLUFF 3500 600 FINGAL

300 500 300 HUMMOCKY HILLS 4000 SOUTH 300 River 400 1200 120 200 4500 300 700 600 00 500000mE 550000mE 600000mE 650000mE

INKS ARE LIGHT SENSITIVE WARNING: Plotfile for this map generated from digital data: 05-OCT-2006

/covers/project/tas_gw_pros/amls/gw250_nw_out tds