Rough Sums30 Jun 2021 12:45
Back in the happy days a few months ago I did some sums to estimate the ore resource at BR. I thought I'd do the same again based on the IP survey of the currently known resource. If anybody wants to question my figures then please do but my figures are currently based on the following assumptions.
The length of the resource is 2.5 km long
The width is approx 1.5 km wide
The depth is approx 500 m deep.
The density is 2.7 T per cubic meter
The grade will vary widely through the resource so a conservative figure needs to be taken for this factor and I have chosen as 0.2%
As the resource is not a rectangular box I have rounded off the edges by multiplying the size of the resource by 0.6
This gives an overall ore resource of 3 billion T and a Cu resource of 6 million T which, when I last checked, is a tad more than the 2 million required by AA.
My only reservation is that on average, when considering that there will be barren patches within the resource, the grade used (0.2%) may be a tad high. However, although the resource appears to be petering out to the north it is still going strong to the south and this has not been included in my sums. So, who knows how high the Cu content may eventually reach.
Please substitute your own figures and let me/ us know what you come up with.
Cygnus