Saturday, August 28, 2010

Sampling a Placer for Gold

Experiment is an important first part of any mining program, whether large or small. A good experiment program, even while it can run into some cost, will save money

in the long run. No mining risk should be started on old stories, a quick look at the property, or hope. Instead a careful examination program should be followed. A most central part of this exploration is the test of the deposit. The central point of sampling is to decide if the deposit can be worked for a profit, but other essential things can also be learned from an excellent sampling program. Knowing these things may change a medium deposit into an economically lucrative deposit.
By character, most placer deposits are irregular and conflicting. Since most deposits were shaped by stream action depositing material, they can be and frequently are as irregular as the flow and form of the river which deposited them. Certain parts may have relatively little gold, while other spots in the deposit may have much gold. By charily sampling one may be able to locate where the better parts of the deposit are most likely to be found.
Layering of the deposit material, or stratification, is occasionally very apparent in placer deposits. Cautious examination of these deposits may show that some contain much more gold than others. A base deposit may be found, below which little or no gold will be found. Knowing this could save money, for then the minor part of the deposit would not be mined. Similarly the upper deposit may not contain much or no gold, and might be exposed off and only the lesser strata mined.
It is essential to know the range of the sizes of the gold elements when working a placer deposit. Are there enough large pieces to make hand picking gainful, or only a special piece? Will the riffles in your wash box catch all the gold, or will the minor atoms be carried off needed the tail to be re-screened to a lesser size and put over a second wash with less water? There may not be enough gold in a certain size range to make it lucrative to recover that size range’s .A good sampling program may response many of these questions and give your  order which will enable you to plan just what type of improvement will be efficiently lucrative.
Several placers have been worked to improve rude gold with ,no attempted  to save the finer gold .And in many cases the finer gold if it had been saved ,would have amounted to more than the crude gold did. A good sampling program then should give you an idea of how much gold is there, but also an idea of how the deposit should be worked if it shows profitable worth.

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