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Message: Trenching - across vs along

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Trenching - across vs along

posted on Oct 03, 10 02:01PM

Hi,

There is much food for thought this Sunday with excellent Q's from Johnny and CJR and equally excellent replies from our resident SMEs.

Here's my attempt to make an omellete. Given Hoov's boiled egg analogy, why are (bulk) trench samples taken across strike, when it is known that the material scooped from the edges will contribute to lowering the average grade. Why not stay within the boundaries and collect the bulk samples along strike. Wouldnt this provide a more representative idea of the average grade. Its complicated enough to account for the nugget effect, why complicate it further.

I'm also comparing the 700 tonne sample with GBB's 30,000 tonnne bulk sample of their 'block model'. I could be wrong but they seem to have taken samples from all over their mineralised zones. (Yes, the style of mineralisation is different - shear zones vs hydr fracturing, but surely that has nothing to do with bulk sampling methodology.)

brgds - BW

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