Developing Bellechasse-Timmins Gold Deposit
New Discovery Resulting in a 20KM Mineralized Gold Belt
Message: more nugget info
Without proper size samples the database for the deposit likely contains a few samples that are too high in grade, but far more that are too low in grade. Francis Pitard concluded in his 2005 report on Black Fox mineralization that: •
“The size of the core samples can account for local geology, but cannot account for the
local gold content: Relative to the size of the coarse gold, the core mass is too small. The resulting effect is called the In Situ Nugget Effect: It is of the utmost importance for management to understand it; •
As a result, Poisson skewness enters the database, leading to a frequent under-estimation
of many ore blocks, and an occasional over-estimation of a few ore blocks; •
Such skewness, if carried too far, as I believe is the case, can under-estimate the gold
content of the deposit. However, and this is very important, it is an undeniable fact that the Ore Reserves are under-estimated. This is something to keep in mind: Poisson skewness affects the grade somewhat, but above all, makes a disaster on the estimation of the Ore Reserves, unless you are very lucky by having sharp, natural and obvious ore boundaries (e.g., Midas mine in Nevada); and •
By the time the sample is taken to the laboratory sample preparation, you have already
lost its main purpose which is to be reasonably representative of all gold particle size fractions. Then, the preparation and assaying procedure, ignoring the potential presence of coarse gold, makes things even worse, most likely introducing a superimposed secondary Poisson skewness in the database.” Prenn (2006) concurs with Pitard’s (2005) conclusion, that the drillhole data is likely biased and will likely underestimate the contained gold within the deposit.
7 Recommendations
Loading...
Loading...
New Message
Please
login
to post a reply