Very Low Frequency (VLF) is a passive survey that uses the interaction of radio communications signals with geological features. VLF is primarily used as a first pass reconnaissance tool to look for shallow bedrock conductive features.

VLF is often employed to identify conductive features, such as sulphides. It is also widely used to identify and trace structural features, such as faults.

VLF can easily be combined with a magnetometer survey to quickly identify targets for further exploration. VLF is also frequently used to ground truth and geo-reference anomalies that were historically identified or identified through airborne surveys.