Graystone - Geochemical/Geological data analysis:
drilling is performed, as in any geochemical investigation to collect samples...it is through the collection and analysis of samples that verifies that their metal is in the ore. it is the determination of the location of the samples in space that tells where on a map, and in a 3-dimensional representation (i.e. modeling software) to place the results of the analysis for further interpretation. In addition to this data, the geologist maps - on a topographic map, and represents in cross-sections - the 3-dimensional character of the ORE-BEARING UNIT or STRATA as it falls with the SECTION (the capped terms can be looked up a most geologic dictionaries). Next, the geologist/geophysist estimates the volume of the ore deposit - in this case a placer deposit consisting of ore-bearing sediments derived from the weathering of the mountains upstream - by determining the thickness based on the topography at a system of surface points. Ore bodies are estimated based on topography - particularly when a portion of the deposit is surficial in nature. Drilling is simply a means of collecting data to determine where the deposit exists beneath the surface.
In addition, Mr Paravicini's report stated that the volume of the deposit was estimated at only 30-40% of its inferred volume based on the topographic data.
You are correct in stating the drilling is used to estimate the volume or size of the deposit, however, it is not the sole provider of information. This is why I stated that while expediency is critical, the process is complicated and can't be done by, say, next Monday or even the Monday after that. It will likely take a few weeks, once the contractor is hired.
If you have any more questions regarding these types of investigations feel free to ask here or e-mail me at taanders@mines.edu
toma
Colorado School of Mines
Golden, Colorado
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