The drillhole database (also known as the borehole database) is a central store for information on holes drilled for a range of purposes. It facilitates minerals and petroleum exploration and mining/extraction, as well as assessments of groundwater.
The database contains over 140,000 records, divided into the following categories:
- heavy mineral sands
- extractive industry
Reports and data
Non-confidential borehole data is available in MS Access, MapInfo and ArcView formats as part of the Geoscientific Data Package DVDs from the Online Store. Borehole information can also be obtained via the Search Assistant and as a map layer in GeoVic.
History of Data Capture
Prior to 1980 borehole data was recorded by GSV on 1 inch:1 mile plans and hard-copy borehole records. This included data for water boreholes drilled by public and private sector, all boreholes drilled by Minerals and Petroleum Division, petroleum wells and some private-sector mineral exploration boreholes. In areas where drilling was of particularly high density, locations were recorded on these plans as a single point or as occurring within an outlined area.
The parish was traditionally used as the primary classifier for numbering boreholes. Some minor anomalies exist where a borehole and parish boundary may be on one side of a road or the other, or where parish boundaries have been moved.
In 1980 the location data was moved to 1:100,000 AMG plans. In the mid-1980s a program of electronic capture commenced. Borehole locations were digitised from the 1:100,000 plans with an accuracy of 300 m. For the areas of high borehole density where boreholes were plotted on a single point, often only the first ten and last ten were recorded in the database. Boreholes whose parish was known but exact location was unknown were also recorded, but do not have a location.
The capture of mineral exploration borehole data from open-file exploration reports commenced in 2001 and is ongoing. Historic data is being captured at the best accuracy the source allows, typically between 20 and 250 m. Assay data has been consistently captured. Other down-hole data has not been consistently captured.
For further information about the borehole database contact us.