Water Level Loggers

Tel: +44 (0)1428 661 660

Mineral Exploration Equipment

Van Walt Ltd has been supplying equipment for soil and water research for the past 30 years and some of our soil research equipment has proved to be very beneficial for companies involved in mineral exploration.

Window Sampling System

Van Walt Window Sampling materials have many features that make the system special:

Small & portable so can be transported to and from sites in an ordinary car or van. The samplers are driven into the soil with a percussion hammer such as the Atlas Copco Cobra TT.

Produced of steel and available in different diameters and lengths so are ideal for sampling up to 10 metres in depth in hard soils that may contain rubble, bricks or stones.

The RD 32 rope thread connection is very strong. The rope thread is in one piece so has no moving parts.

Maintenance free unlike the older type M-20 or M-22 threaded studs

Connection is by one-piece coupling sleeves.

Sampler top is hollow to maximise the percussive action. The top sections are manufactured as one piece and are pressed then welded onto the sampler for added strength.

Gouges are laser cut and shaped specifically to improve insertion speeds, making it the ideal system for repetitive sampling.

Cutting heads are manufactured of hardened steel and rigidly tested to withstand 30 minutes on reinforced concrete.

Uniquely designed window-less core sampler for undisturbed samples 100cm long in sleeve.

Samples are captured in an undisturbed way for on site profile evaluation.

Manufactured for strength but of a minimum thickness to ensure ease of application and minimum sample disturbance.

Foil Liner

To capture a profile in a liner there is a window-less sampler which uses a unique foil liner.

The foil liners are cheap, easy to store and transport and designed to make it easy to retrieve the sample, unlike the more expensive rigid PVC liners used on other systems.

Basic Auger Set

Our Basic Auger Set can be used for augerings in heterogeneous soils with several different auger types to cope with a variety of soils to depths of 7 meters.

General Auger Set

This comprehensive auger set is for exploration above the water table in all soils and below the water table in cohesive soils to a depth of 5 metres.

Mineral Exploration Soil Research

Get it right first time, every time with the right equipment

There are important principles to remember in soil research: sample per layer, never mix your soil layers and be sure to avoid the contamination of deeper layers by dropping soil down from higher layers.

"A simple and extremely efficient tool for extracting soil samples is an auger and it may seem incredible but it's nonetheless true that the manufacture of the "Edelman" type of hand auger is still finished by hand. Two highly trained craftsmen stand at the forge and bash away at the metal to give it the perfect shape. No machine has yet been able to replicate the skill of the craftsman.

Alternatively if you need a mechanical sampling device our percussion window sampling kit is a powerful, non destructive, low disturbance site investigation tool. It uses laser cut, high entry efficiency samplers in our unique, robust, no maintenance, left hand thread RD32 connection. It is ideal for sampling and research in sites with restricted access, where there is the potential for contaminated samples or for exploration of base metals and mineral deposits, like gold and other precious metals.

Your choice of sampling tool is determined by a number of parameters:

1. Disturbed or undisturbed: If a (semi) disturbed soil profile is acceptable then the "Edelman" type of hand auger is a good choice. It is easy to use, surprisingly effective, quick, light and cheap. If an undisturbed sample is essential then the gouge or window type of sampler is preferred. In harder soil insertion is usually carried out with a percussive mechanical hammer, either with a mechanical breaker such as the Atlas Copco Cobra TT or with a (micro) drilling rig such as the MRZB track mounted hydraulic rig.

2. Above or below the water table: As soon as depths are achieved to levels below the water table, the hole created by the sampler will collapse. In these circumstances, the hole will need to be cased. This is usually done with either an ABS or steel casing. Samples are then taken from within the casing which is lowered into the soil. Where sand is present this will be removed with a bailer.

3. Capture of the sample in a liner: Where samples need to be transported from site for further laboratory investigations and need to be retained in their original form and profile, liner samplers are used. Liners are usually made of polythene, acrylic or transparent PVC but can also be (stainless) steel. Special mention needs to be made for sampling of volatile organic compounds (VOC's). By their nature, these compounds volatilise quickly and specific equipment has been developed to conform to new working guidelines which will most likely result in ISO and EN standards.

4. Specialist sampling requirements: This could include samples for the above mentioned VOC's, pesticide residues or samples for bulk density analyses. Special kits with or without liners have been developed specifically for these applications.

Soil Sampling Options - Click Here