Sample Collection
A sampler will need: A field map, baggies (Zip-lock), a marking pen (Sharpie, permanent marker) a pencil (for recording field
sample points) and a stout hand shovel. Other useful items would be a GPS a compass and a backpack.
Sample Location
Geochemistry is a statistical process. A single sample point is used to represent the geochemical value of an area. The size
of this area is determined by the sample density. The point at which you sample is only one value of the distribution of
potential  sample values available in the sampled area. The significance of this is that geochemical sample points do not
have to be precisely located. Therefore the sampler should adjust the sampling location if the conditions of that sample are
poor. Disturbed or excavated areas should be avoided as should areas contaminated with hydrocarbons, chemicals or animal
wastes. Swamps and areas that are continually under water should not be sampled. The sampler should attempt to locate on
the field map the sample point as closely as possible to the actual sample site but absolute precision is not critical to the
geochemical survey results. A field vehicle odometer combined with topographic orientation will provide acceptable sample
locating precision unless sample density is less than 1/10 kilometer.
GPS systems are both inexpensive and accurate and are
great for geochemical surveys
Procedure
Sample identification numbers should be as simple as possible. This saves time in the field and reduces errors. The simplest
system is consecutive numbers beginning with one. Letters preceding the number (i.e. PRJ1) can uniquely identify the
samples for each of your project areas. Prior to the commencement of collection an adequate number of bags should be
numbered and organized in groups of ten. Using the bags sequentially and recording the bag number on the field map or
"marking" with a GPS at the time of collection eliminates almost all collection errors. Each sample should be a composite of
four to five equal scoops of soil separated by a few feet. Samples should come from the top few inches of the soil. Rocks,
coarse material, Plant debris, Insects and small animals should be excluded. The total sample should be 200 to 300 grams
(7 to 10 ounces). After collection expel the air and carefully seal the baggie.
Soil should be collected from the top two inches.
The sample should be 7 to 10 ounces unless the soil is
unusually coarse then a larger sample may be needed to
provide sufficient fine fraction.
Three to five equal scoops should
be collected from the immediate area
and placed in the numbered bag.
Shipping
Samples can be shipped directly to GrayStone Labs. A good way to ship your samples is in five gallon buckets. Buckets can
not be damaged during shipping, they hold forty to fifty pounds of samples and they have a handle. Small and medium sized
cardboard boxes also work well as long as you place the samples in plastic trash bags to prevent moisture from reaching the
cardboard and tape the box heavily. Keep boxes less than 18 kg (40 lbs). The box should be sealed with heavy shipping
tape and addressed exactly as listed below. If you are sending samples from out of the United States please call
303-278-3252, and I'll give you the special shipping information you will need for the importation of soil samples.


GrayStone Exploration Labs, Inc.
15400 W 44th Ave. Suite 21
Golden, CO     80403
Contents: Soil Samples
GPS
Back Pack
Hand Shovel
Clip Board
Utility Belt
Ready for the Field
Field Equipment
GrayStone Exploration Labs, Inc
GrayStone Exploration Labs, Inc