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Metadata : Northern Territory Geological Survey - Geochemistry - Drillhole Maximum Assays |
Index:
Metadata Details:
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Version:1.0
Date Metadata Extracted:2026-08-08
Date Metadata Last Updated:2026-06-30
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=27529218AC1DC109E0632144CD9BBFD3
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=27529218AC1DC109E0632144CD9BBFD3
Citation
ANZLIC Identifier:27529218AC1DC109E0632144CD9BBFD3
Title: Northern Territory Geological Survey - Geochemistry - Drillhole Maximum Assays
Citation Date:2024-11-20
Date Type:creation
Custodian:Department of Mining and Energy
Description
Northern Territory Geological Survey (NTGS) geochemical and drilling datasets contain information on open file geochemical data for samples collected by companies and NTGS. Drillhole samples are defined as samples derived from a drilling process where Sample Method may be described as core (diamond drilling), rock chip (Reverse circulation drilling), cuttings (Rotary air blast drilling), and Drill Type may be described as DD (diamond drilling), RC (Reverse circulation), RAB (percussion rotary air blast drilling), AC (air core), auger.
The data is captured by the department via statutory reporting from exploration companies or NTGS projects. Drillhole geochemical data consists of major elemental oxides, trace and rare earth element abundances collected on subsurface rock samples.
Drillhole maximum assays are the highest assay result for each element/analyte obtained over the sampled length of the hole. No depth down-hole is recorded as the assays may come from different samples down-hole.
- geoscientificInformation
Bounding Coordinates:
- North Bounding Coordinate:-10
- South Bounding Coordinate:-26
- East Bounding Coordinate:138
- West Bounding Coordinate:129
Dataset Status
Dataset ID:
Language:English
Character Set: Latin 1
Progress:onGoing
Maintenance and Update Frequency:weekly
Data Currency Start Date:1956-01-01
Data Currency End Date:2026-04-01
Access Constraint:Only open file data available.
The Northern Territory Government supports and encourages the dissemination and exchange of its information.
The copyright in this publication is licensed under a Creative Commons Attribution 4.0 (CC BY) International Licence https://creativecommons.org/licenses/by/4.0/legalcode
Under this licence you are free to use this publication in accordance with the licence terms without having to seek our permission.
You must keep intact the copyright notice and attribute the Northern Territory Government as the source of the publication.
Attribution to: Northern Territory Government (Northern Territory Geological Survey) 2026.
Data Quality
Lineage:Drilling, sample and assay data are captured from both open-file company exploration reports and NTGS projects. Open-file data is either supplied in digital form or extracted from hard copy formats. Exploration data is captured routinely as digital data is submitted and from legacy hardcopy reports by either manual processes or scanning and digitising, including spatial data capture from maps where necessary.
Legacy data capture is ongoing and usually on a geological terrane basis. More recent exploration reports and data are supplied in digital formats and have been uploaded directly into a database after transcription to a standard loading template. Data is transferred into a SQL Server database via data type templates e.g soil, rock, drillhole etc. Data is validated twice, at the template stage (before entry) and during loading into the database.
Positional Accuracy:Approximately 20-150m metres using 100k topographical maps or 1-10m using GPS.
Attribute Accuracy:Analysis is performed by laboratories to set standards.
Logical Consistency:Data is logically consistent for the purposes of geological interpretation.
Completeness:Data is as complete as possible for each record. Due to the flat file nature of the STRIKE layers the laboratory method information is not included for each assay and the original source of the data should be checked.
Laboratory metadata is now included with full 'raw' (as-reported) geochemical analyses in the Northern Territory Geochemistry Datasets, Digital Information Package 1 (DIP001) https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/94622 on a report basis for all rock sample types. Company reports can be searched and downloaded via GEMIS https://geoscience.nt.gov.au/gemis
Datasets in .shp, .tab, and .csv formats are available for download in STRIKE https://strike.nt.gov.au/ via Downloads > NT Wide Datasets > Geochemistry.
Contacts
Name Organisation Position Role Phone Fax Manager Geoscience Business Systems Department of Mining and Energy Manager Geoscience Business Systems custodian (08) 8999 5448 (08) 8999 6824 geoscience.spatial@nt.gov.au
Data Dictionary
Attribute Attribute Description Possible Code Code Description PCT This applies for all columns named with the convention of element_PCT e.g. AG_PCT (Unit of Measure of Percentage) -9998 to 0 Percentage (PCT) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available -9999 Represents a NULL for elements that have not been analysed in a sample 0 to +999,999.99 Percentage (PCT) values can range between +999,999.99 and 0. These positive values mean that the concentration of chemical element is high enough to be detected if measured by technology available PPB This applies for all columns named with the convention of element_PPB e.g. AG_PPB (Unit of Measure Parts Per Billion)
Percent, parts per million (PPM) and parts per billion (PPB) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available-9998 to 0 Parts per billion (PPB) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available -9999 Represents a NULL for elements that have not been analysed in a sample 0 to +999,999.99 Parts per billion (PPB) values can range between +999,999.99 and 0. These positive values mean that the concentration of chemical element is high enough to be detected if measured by technology available PPM This applies for all columns named with the convention of element_PPM e.g. AG_PPM (Unit of Measure Parts Per Million)
Percent, parts per million (PPM) and parts per billion (PPB) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available-9998 to 0 Parts per million (PPM) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available -9999 Represents a NULL for elements that have not been analysed in a sample 0 to +999,999 Parts per million (PPM) values can range between 0 and +999,999.99. These positive values mean that the concentration of chemical element is high enough to be detected if measured by technology available PPT This applies for all columns named with the convention of element_PPT e.g. AG_PPT (Unit of Measure Parts Per Trillion) -9998 to 0 Parts Per Trillion (PPT) values that fall below 0 into negative values (excluding -9999) demonstrate that the concentration is below the detection limit of the technology available -9999 Represents a NULL for elements that not been analysed in a sample 0 to +999,999.99 Parts per Trillion (PPT) values can range between +999,999.99 and 0. These positive values mean that the concentration of chemical element is high enough to be detected if measured by technology available
Supplementary Information
This record maintained using the NTLIS Metadata Tool