Program Design and Sample Layout

Two options are available for designing a geochemical exploration program. Clients can have GeoFrontiers layout a program, or clients can design their own program.

Important considerations for designing a geochemical program are:

In addition to sample spacing, sample pattern is a consideration. Examples of common sample patterns are shown in the examples below.

Designing a sampling program is not an easy task and can be time consuming. GeoFrontiers is available for help or consultation if needed. Or, we can design a program to your specifications and for your approval.

 

Sample Design Examples
   
Regular Grid

Samples were laid out using a 660 foot (200 m) Regular Grid pattern. This is the simplest grid design because all the samples are 660 feet (200 m) apart vertically and horizontally. The diagonal distance between samples is larger at 930 ft (280 m). This type of layout works well on areas that have few obstacles and are geographically flat.

We design most sampling programs using a combination of topographic maps and aerial photos. Sample programs overlaid on these basemaps show obstacles or difficult access, and the sample design can be adjusted before going to the field. Good sample planning generally translates into more efficient sampling in the field.

Using the same area as above, a different sample layout is the Staggered Grid pattern. Samples are 660 feet (200 m) apart horizontally. Every other sample line is offset one half sample spacing which decreases the diagonal spacing between samples to 740 ft (225 m).

The red dashed line around the sample area is a digital boundary layered onto the map using program corner coordinates. This boundary provides a guide line that is easy to see and shows program limits.

Notice the black dashed line labeled "Pipeline" running through the program Samples close to the pipeline would need to be moved for safe interstitial gas sampling. All underground utilities need to be located before probing or drilling.

Staggered Grid

Equidistant Grid

This example is a 660 foot (200 m) Equidistant Grid. Each sample is the same distance of 660 feet (200 m) away from each surrounding sample. This pattern is sometimes called a triangular grid because 3 nearest samples form an equilateral triangle. The pattern is also called a hexagonal grid because 6 nearest neighbors form a hexagon around the center sample.

Sample points were laid out digitally, and show Identification numbers at each sample location. Unique sample numbers tie together map locations, GPS locations, and laboratory data.

Another example program was designed for high sample density in a selected area to meet a particular objective. Samples are in rows of three and closely spaced at 200 feet (60 m).

Special Grid

 

Each program is designed to meet clients' exploration objectives and specifications.

 

For information on shallow soil sample collection, click here to view or download a PDF manual

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