UXO Detection

For the past 15 years NAEVA Geophysics Inc. (NAEVA) has provides well-trained field teams to perform digital geophysical mapping (DGM) in support of unexploded ordnance (UXO) clearance activities on projects sites throughout the US and overseas . NAEVA’s responsibilities often include the demonstration of techniques and processes in an existing Geophysical Prove-Out (GPO), full-coverage and/or transect-based DGM over the acreage specified for each task, preliminary and advanced data processing and target list development, collection and presentation of Quality Control (QC) data, target removal verification, database management, GIS, and contributions to Work Plans and Final Reports.

Equipment Used

Geonics EM61 and EM61-MK2 metal detector
Geometrics G-858 Gradiometer
Geonics EM63 multi-channel metal detector
Geophex GEM-3 metal detector

For DGM, NAEVA will typically utilize either the Geonics EM61-MK2 or the Geometrics G-858 vertical gradiometer. If the sites are open and of sufficient size, NAEVA may elect to utilize a towed-array of geophysical sensors to perform the mapping as opposed to person-portable operations. The towed array will consist of two to three EM61-MK2s on a sled or wheeled platform. The determination as to which method to be used for mapping will be established after analyzing the specific instrument’s detection capabilities at the GPO and/or after consideration of local site conditions.

In open areas free of tree cover, NAEVA will utilize a Trimble 5700 Real Time Kinematic (RTK) Global Positioning System (GPS) to provide accurate, real-time data positioning. In areas of significant tree cover prohibiting the use of real-time GPS, a Trimble S6 Robotic Total Station (RTS) instrument or conventional survey techniques making use of strict survey controls within a local coordinate system will be utilized.

Geophysical instruments and techniques are constantly evolving in an attempt to achieve the best detection capabilities in the shortest amount of time. NAEVA continually monitors emerging technologies and is always ready to implement them should they prove beneficial to that goal.

UXO Data Processing

NAEVA processes and analyzes UXO data using Geosoft’s OasisMontaj software with the UX-Detect module. This software enables the application of data corrections to the raw data and generating corrected gridded data which is used to interpret anomaly locations.

Click here for a more detailed description of data processing procedures.

UXO Quality Control

Click here for examples of quality control measures carried out on UXO projects.


UXO presents a potential hazard on public and private land around the world