NI 43-101 Preliminary Economic Assessment - Verde Potash

More documents

Recommendations

Info

Verde Potash Plc 12-11 Cerrado Verde Project NI 43-101 Preliminary Economic Assessment 12.2.4 Data Selection The drillhole data selection is a standard procedure of certification. It is essential that, in the classic statistical analysis, geostatistics and in the grades interpolation process, are used the correct samples. To the selection of the drillhole samples were used solids of the element to be analyzed. Analyzing the collected samples to each target is noted that for the Target 6 the majority samples have a length of 1 m, and to the other targets the majority has 2 m length. To use the same methodology to all the targets was assumed a 1 m length samples for the composites. The creation process of the composed intervals began on the drillhole collar continuing on the perforation way (down). The samples with high and low K 2 O grades were divided into composed samples of 1 m. Then, files of the composed samples were encoded by the mineralization body solid. To each composed interval was assigned a value in the field ORE, being ORE=1 if the composed interval is inside the mineralized body solid, and ORE=0 if not. 12.2.5 Modeling The blocks models were created in order to intersect the tridimensional solids and represent then, in defined dimensioned blocks. The blocks parameters are listed below, Table 12.2.5.1. The block model process of the solid includes the sub-blocks process. Initially, the model was filled with blocks of 50(X), 50(Y) and 10(Z) meters, that were divided into smaller subunits, with a factor for the subdivision of 10, at the contact with the three-dimension solid that limit them. As result, at the limit with the solid, the size of the blocks became 5(X), 5(Y) and 1(Z) meters. The initial size of the blocks was chosen based on the morphology of the mineralized bodies and the dimension of the exploration grid (1/4 of the grid). The Model of the Target 4 has 16.786 blocks, Target 6 has 28.037 blocks, Target 7 has 193.382 blocks, Target 10 has 10.114 blocks and Target 11 has 23.889 blocks. The solid was used to create a block model inside the geologic mineralized body. This solid was used to encode this blocks. The digital model of the topographic surface was used to limit the block models by the vertical axis. SRK Consulting (U.S.), Inc. September 16, 2011 Cerrado Verde_NI 43-101 PEA_343500.020_007_KG
Verde Potash Plc 12-12 Cerrado Verde Project NI 43-101 Preliminary Economic Assessment Table 12.2.5.1: Block Models Parameters Target Target 4 Target 6 Target 7 Target 10 Target 11 Extension (m) Block Models Block size Sub-block minimum Number of Minimum Maximum Directions (m) size (m) primaries blocks East 387000 390000 50 5 61 North 7855000 7859000 50 5 81 RL 750 1100 10 1 36 East 390000 392000 50 5 41 North 7856000 7859000 50 5 61 RL 800 1100 10 1 31 East 403000 409000 50 5 121 North 7865000 7874000 50 5 181 RL 750 1000 10 1 25 East 408500 410500 50 5 41 North 7873500 7876500 50 5 61 RL 800 1000 10 1 21 East 409000 415000 50 5 121 North 7874000 7879000 50 5 101 RL 750 1100 10 1 36 12.2.6 Geostatistical Analysis The target chosen to geostatistic study is target 6, because it is relative regularity of the grid exploration, amount of data (802 samples), and isometric body shape. Semi Variograms were built for this target. For the construction of semi variogram were used the composite samples file. Cross-validation process was used to check the variogram, showing a low statistical error in data interpolation. The results of verification by Cross Validation are presented in Table 12.2.6.1. A diagram of linear dependency was also built between the samples file data and the interpolated K 2 O obtained by the cross-validation process. Results were satisfactory, presenting a correlation coefficient of 0.73 and accuracy of 13.5%. Table 12.2.6.1: Cross Validation Verification Results Analysis var K 2 0 Transformation None Number of points 802 Mean Std Dev Raw Data 8.1965 1.5967 Estimate 8.2081 1.4248 Standard error 0.82398 0.24225 Error statistic -0.007620 1.2884 12.2.7 Grade Estimation and Resources Classification To target 6 the element K 2 O was interpolated to the empty block model by the methods Kriging and IDW (Inverse Distance Weighted). SRK Consulting (U.S.), Inc. September 16, 2011 Cerrado Verde_NI 43-101 PEA_343500.020_007_KG
Page 1 and 2:
NI 43-101 Preliminary Economic Asse
Page 3 and 4:
Verde Potash Plc Cerrado Verde Proj
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Verde Potash Plc 1-1 Cerrado Verde
Page 17 and 18:
Page 19 and 20: Verde Potash Plc 2-2 Cerrado Verde
Page 23 and 24: SRK Project No.: 343500.020 Cerrado
Page 27 and 28: Cerrado Verde Potash Project Minas
Page 69: Verde Potash Plc 12-10 Cerrado Verd
Page 73 and 74: Verde Potash Plc 12-14 Cerrado Verd
Page 75 and 76: Verde Potash Plc 12-16 Cerrado Verd
Page 109 and 110: *Map image not to scale. For illust
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
SRK Project No.: 343500.020 Cerrado
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
SRK Consulting (U.S.), Inc. 7175 We
Page 143 and 144:
SRK Cardiff 5th Floor Churchill Hou
show all

NI 43-101 Preliminary Economic Assessment - Verde Potash

Create successful ePaper yourself

Delete template?

Save as template?