Citation

Jacobson, G., 1991. Hydrogeology of the Kakadu Conservation Zone near Coronation Hill, Northern Territory. Record  1991/003. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

Groundwater extraction is proposed to fulfil the partial water supply requirements for the proposed gold-platinum-palladium mine at Coronation Hill, Northern Territory. The aquifers in the Conservation Zone surrounding the mine are fractured Proterozoic dolomite and volcanic rocks. These aquifers are recharged partly by direct infiltration of rainfall, and partly by inflow from upstream reaches of the South Alligator River. Theaquifers discharge to downstream reaches of the river. The environmental impact review of the mine proposal has raised two hydrogeological issues: whether seepage of cyanide-bearing process water will pollute the aquifer and river; and whether aquifer drawdown will affect the flow and ecology of the river. Available information indicates that some cyanide-bearing process water will seep into the aquifer, but that the pollution plume will be attenuated to some extent by chemical reaction and degradation. Available river stage data have been used to estimate the effects of drawdown due to proposed extraction of groundwater for mine water supply, and also mine pit groundwater inflow. The long term groundwater extraction and pit inflow is probably about 25 L/s. River flow at Coronation Hill has fallen below 250 L/s on 84 days in 8 out of a documented 51 months, and the long term groundwater extraction and pit inflow is equivalent to about 10 % of river flow in these low flow months. The wellfield should be designed for minimal drawdown, and management criteria should be developed to avoid ecological damage in low flow conditions. Remaining doubts about the river/aquifer interaction need to be resolved by further investigations.
Google map showing geographic bounding box with values North bound -13.5 East bound 133.0 West bound 132.5 South bound -14.0
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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1991

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
hydrogeology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-13.5
East bound
133.0
West bound
132.5
South bound
-14.0

Lineage

Legacy product, lineage not available

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-eff9-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

1999-08-09

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays