Metal Detector Surveys

We pride ourselves with being professional, trustworthy and highly knowledgeable in the field of archaeological metal detecting.

Collectively, we have thousands of hours of survey work under our belts, making us the ‘go-to’ team for your projects.

We understand the need for consistent detecting, accurate recording of find spots and the full appraisal of all finds, especially regarding artefacts and coins that may fall under the Treasure Act.

You will also be guaranteed our full discretion with regards to both your site and any objects recovered.

Survey Methodology.

AHARG specialises in systematic metal detector surveys using a transect based methodology originally developed for the 1485 Battle Of Bosworth survey. This system is designed to maximise the coverage of the survey area, with any historical or pertinent finds logged using the latest GPS technology. Find spots and coverage can then be registered using MapInfo digital software.

We would normally recommend using 2.5 meter transects as our standard survey method and would routinely detect on full discrimination mode i.e., We walk 2.5 meters apart and collect predominantly non-ferrous objects. However, this survey method can easily be changed to 1.25 meter transects and we can, if deemed necessary, detect for all metals.

We supply all the equipment necessary for us to carry out a survey over any area.

AHARG are a small dedicated team of six highly experienced operatives, which allows for more effective management on site during surveys and frees up your staff to better utilise their skills elsewhere – saving you time and money.

We are happy to undertake all sizes of projects. For example, we have recently worked on two planning application surveys, one of which was just under 0.25 hectare and the second nearly 55 hectares. For a successful survey to be conducted, ground conditions must be taken into consideration. Ideally, the site would be a flat harrowed field that had previously been ploughed, with the soil naturally settled, short pasture, low stubble or recently germinated crop. For metal detectors to work consistently they must be used close to the ground surface or results cannot be guaranteed.

We cannot guarantee to recover 100% of the potential objects from any area after one survey – however we will be able to help assess the likelihood of what the history of the area may have been through both recent and historic times. Our survey will also help with analysing any potential concentrations of specific finds within the area. Additionally we have found that our survey methods have been proven essential in potential planning applications.

Utilising The Latest Technology

Surveys are conducted using our systematic transect methodology hand in hand with the latest GPS and high quality metal detector technology.

Systematic Transect Surveying

The resulting data can then be downloaded to analyse exactly where we surveyed.

GPS Finds Location Mapping

The finds distribution can also be analysed as a whole, or the data can be layered to reflect different periods or types of finds individually, giving you the ability to concentrate on one set of data at a time.

Geophysical Surveys

Geophysical Surveys

AHARG can also carry out geophysical surveys. We have a TR/CIA resistivity meter which we have used to successfully carry out six surveys in the 2 years since purchasing it. In the near future we hope to extend our capabilities by acquiring a magnetometer.

Here is an example of a recent resistivity survey result.

Geophysical Surveys

This plot consists of 25 twenty meter square grids and clearly shows a ploughed-out building indicated by the high resistivity (white) lines sloping down from left to right across the bottom half of the area. This survey was carried out using a 4 probe array at 1m spacing which means that a large area can be tested relatively quickly - 10 grids (4000m2 ) a day can usually be managed with this configuration. For smaller targets we also have 2 and 3 probe arrays which allow for higher resolution survey at 0.5m spacing.

Geophysical Surveys

One of the benefits of the latest TR/CIA kit is that the results are visible at the time of survey on-screen in real time, which can be quite exciting. We also have the capability to assess soil profiles by taking either disturbed or undisturbed samples using Dutch or shell augers.

In summary AHARG can offer: