AI-GEOSTATS: Grade tonnage curves
- 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),the average grade within the deposit should be the same.
> 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?
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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