Geoscience BC Report 2012-12

Stimulating Exploration in the East Kootenays (SEEK Project): East Kootenay Gravity Database
by T. Sanders (Ted Sanders Consulting)

Report Components

Report Description
The East Kootenay ground station Gravity Database is a component of the SEEK (Stimulating Exploration in the East Kootenays) project. This project is funded by Geoscience BC and is a partnership with the East Kootenay Chamber of Mines.

This report describes a collection of ground station gravity data. The majority of gravity data in the database was obtained from data listings in assessment reports on the Mineral Titles Online ARIS (Assessment Report Indexing System) website. Other sources include: contributed data from gravity surveys not presently available on the ARIS website, a subset of the Geological Survey of Canada (GSC) database, and a digitized Bouguer Anomaly posting map (obtained from an ARIS file which did not contain raw data).

All of the original gravity data listings in the ARIS pdf files include Bouguer Anomaly values for each station. However, Bouguer Anomaly values from different contractors used different data reduction formulae and parameters. Some processing errors were also detected in the raw data listings. As a result, leveling adjustments have been made to some of the ARIS GPS survey data, Observed Gravity values, and Bouguer Anomaly data prior to reprocessing and the creation of a uniform Gravity Database. In addition, 30 km Outer Terrain Corrections were calculated for each station as part of data reduction to Bouguer Anomaly values in the database.

This project enables users to download digital (.csv) files of the original ARIS gravity data listings and raw Inner Terrain Correction data. In addition, the complete database (27 fields) of levelled and reprocessed gravity data can be downloaded and includes raw and reduced Bouguer Anomaly values for all stations using three rock densities.

Click here to download an example of a Bouguer gravity map that can be created from the database.

Disclaimer: The majority of original raw data files were assembled from data listings which reside as images of scanned pages in ARIS pdf files. In some cases, the original raw data has been adjusted or corrected to level all data to common datum prior to final processing in the database file. See Technical Report for details. Raw and reprocessed data in the database files have been rigorously checked for quality. However, minor errors may exist and the accuracy of original or adjusted GPS positional data cannot be guaranteed. Questions or suggestions regarding the Gravity Database can be directed to Geoscience BC.

Suggested Reference
Sanders, T. (2012): Stimulating exploration in the East Kootenays (SEEK project): East Kootenay gravity database; Geoscience BC, Report 2012-12, 27 p.

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