NI 43-101 Preliminary Economic Assessment - Verde Potash
NI 43-101 Preliminary Economic Assessment - Verde Potash
NI 43-101 Preliminary Economic Assessment - Verde Potash
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<strong>Verde</strong> <strong>Potash</strong> Plc 12-4<br />
Cerrado <strong>Verde</strong> Project<br />
<strong>NI</strong> <strong>43</strong>-<strong>101</strong> <strong>Preliminary</strong> <strong>Economic</strong> <strong>Assessment</strong><br />
12.1.5 Grade Estimation<br />
Resource estimation for the Cerrado <strong>Verde</strong> mineralization was completed using Ordinary<br />
Kriging (OK) within the Weathered and Unweathered mineralized domain.<br />
OK is the most commonly used type of kriging. It assumes a constant but unknown mean.<br />
Typical ordinary kriging assumptions.<br />
The typical assumptions for the practical application of ordinary kriging are:<br />
Intrinsic stationarity or wide sense stationarity of the field; and<br />
Enough observations to estimate the variogram.<br />
The mathematical condition for applicability of ordinary kriging is:<br />
The mean E[Z(x)] = u is unknown but constant<br />
The variogram v(x,y) = E[(Z(x) - Z(y))2] of Z(x) is known. Ordinary Kriging equation<br />
Ordinary Kriging equation<br />
The kriging weights of ordinary kriging fulfill the unbiasedness condition<br />
and are given by the ordinary kriging equation system:<br />
the additional parameter µ is a Lagrange multiplier used in the minimization of the kriging error<br />
to honor the unbiasedness condition.<br />
Ordinary kriging interpolation<br />
The interpolation by ordinary kriging is given by:<br />
Ordinary kriging error<br />
The kriging error is given by:<br />
SRK Consulting (U.S.), Inc. September 16, 2011<br />
Cerrado <strong>Verde</strong>_<strong>NI</strong> <strong>43</strong>-<strong>101</strong> PEA_3<strong>43</strong>500.020_007_KG
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