RE: RE: RE: Vette Im CuriousChappy: "
Maybe the Titan model and this limited amount of drilling is enough to add a bit to the Inferred or Indicated levels of the RE. I stll haven't found a clear definition/description of what it takes to make Inferred or Indicated. "I see this information beginning at the bottom of pg 1-15 of the 2011 RE:
AMEC used the following criteria to pre-classify blocks into categories as:
- Measured mineral resources: require composites from a minimum of three drill holes within a 70 m radius from a block centroid
- In addition, AMEC only classified blocks to the Measured category if more than two thirds of the ordinary kriging weight used in grade interpolation came from the higher confidence Copper Fox drill holes
- Indicated mineral resources: samples from a minimum of two drill holes within a 135 m distance from a block centroid.
Blocks that were not classified as Measured or Indicated categories, but falling within the copper grade shell were classified as Inferred. Remaining blocks were not classified. A semi-automated process was used to smooth the initial classification and avoid islands or isolated blocks of different categories.
I haven't gone back to check whether AMEC's criteria for Measured & Indicated differs from the criteria used in 2007 RE. If so, that might help to explain why the amount of Measured resources was so drastically lower in 2011 than in 2007?
I'm curious whether anyone with geological training (Mudguy?) can comment on whether AMEC's requirements for Measured & Indicated resources is a more conservative standard than what is used by other companies?