Exploration of Alluvial
Gold in the Region

Factors that need to be considered in the evaluation of placer type deposits

• The commercial value of gold
• Average strength of the gravel
• The conditions of the bed rock
• The boulders that can affect an optimal mining operation
• The total volume of minerals that contain gold
• The average value of gold in these minerals by unit of volume (m3)
• Supply of the water that will serve for exploitation
• Of its location as far as the means of communication
• The set up and take down of everything

A good sampling program should provide all the necessary information of the exiting physical conditions and factual interpretation of all the information.

Sampling
Sampling are techniques that serve to obtain samples that are representative of a deposit, and the results of these are utilized for the economic evaluation and the systematic evaluation of the deposit and which in some cases might be something looking into.

Integral method. This method consists of manually extracting separately all of the volume of the material in each differentiated horizon or by layers of 1.00 meters in thickness, classifying them in overload, superior or inferior gravel and the number of the sampling that belongs to each layer, in progressive function of the depth that is reached. This method is more recommendable even though it is very hard work, because it allows better support and confidence to the result of the sample, since it is more representative and real in volume. Besides this, with this data we can elaborate the geological column and the value of the alluvial deposit.

Method through channels: Once one of the walls of the shaft has been set up as vertically as possible, a technique is then carried out to take the sample by this means, whose recommendable section is of 25 x 25 cm. by the variable potency of the shaft. The samples are extracted by layers that are made up of a lithologic horizon be it by the type of material, size of the particles in the gravel, coloration etc. Right after, the samples are panned depending on their precedence until they become reduced into concentrates to the respective counting of the number of gold particles and then register them according to the table of colors.