Here is the feedback that I received on the grade tonnage curve topic. Less
than I thought and there appear to be relatively few books (in print/
readily available) that go into detail on this topic.
Thanks to all that responded.
Alastair Sinclair's reply
A good basic reference is:
David, M., 1972, Grade-tonnage curves: use and misuse in ore-reserve
estimation; Trans. Inst. Min. Metall., sect. A, pp. A129-A132.
In addition, the topic is covered at length in anew text book by Sinclair
and Blackwell available from Cambridge University Press website--chapter
Donald Myer's reply
You might want to look at Michel David's two books on geostatistics, the
second one is titled
Handbook of Applied Advanced Geostatistical Ore Reserve Estimation
I think that the first one was simply
Geostatistical Ore Reserve Estimation
Donald E. Myers
Joao Felipe Coimbra Leite Costa's reply
> 2. If I calculate a point grade tonnage curve (using the sample sections),
> then one using e.g. 10x10 blocks then 30x30 until I reach the size of the
> entire ore body, should I see a change in the ore body grade?
the average grade within the deposit should be the same.
Joao also recommended david's 1977 book.
As always, in the book!!
Your total ore body grade won't change but once you
apply a cutoff, you will see substantial differences
when block sizes change. For examples see old book,
chapter 3 or my paper on mine call factor 1996 at
(note capital P).
Giving a course in Scotland!!
Ore Reserve Manager
Production Unit 1 (Deelkraal)
Tel. 018 785 6625
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