Sample nets

Sample nets are place more or less following these values:

• distance between lines: 1,000 - 1,500mt
• distance between pits: 100 -50mt

The distance between one pit and another is due to the fact that coastline formations are made up by bands more or less parallal to each other, which are normally not more than a hundred to a couple hundred meters wide.

To take advantage of a equipment (generally a dredger), the breadth of these must not be under 70 – 80 meters.

Sample methods
Sampling is done meter by meter, throughout the whole breadth of the drilling. The samples got by successive quartering, are all reduced to 100 grams each, and will be sent to the laboratory to determine the percentage of weighed minerals present.

Following phases of prospecting

When talking about the systematic & semi-systematical phase, along with cubic measuring of deposit, made up of specific methodologies, it is recommended that you study the “Mineral Prospecting manual” by JB Chaussier, J Morer, pgs. 117-136. 

It is practically enough to know that when it comes to sampling, the work essentially consists of diminishing the size of the nets in the following way:

• In large and small tenure volume formations (recent costal type formations, blowouts or dunes)

* Distance between lines: 640-320mt

* Distance between pits:   80-40mt

• In well mineralized reformations (old coastal type formations)

* Distance between lines: 320-160 or 80mt

* Distance between pits:   40-20 or also 10-5m