major ree , page-18

Hello again Stoops and Ausheds,

Yep, you've caught me lurking away in the background again.

First point,
1. The alluvium grade is 0.028%, not 0.28%

This is the calculation to determine concentrate weight, assuming we start with 1000T input;

1000Tx0.028%(Grade)x76%(rec) = T out x 100/6.25(Con Grade)

So for 1000T in we get around 3.4T of con out, this is what then goes to electrostatic/magnetic sep. The next step for them is to determine what the recovery is like through the electro/mag circuit to get their upgrade to the stated 50% TREO.

Recovery is inversely proportional to concentrate grade in most cases but it is not always as clear cut in mineral sands processes such as proposed here. There are a lot of variables. To name just one there can be the presence of composite particles, for instance a grain of sand that is half xenotime/half worthless. This particle clearly will have an adverse effect on concentrate grade if it reports that way or an adverse effect on recovery if rejected.

It isn't just spirals Stoops. It needs to be slurried to the correct density to feed the spirals, there may be pebbles etc to be screened out to name just a couple of other plant requirements. There needs to be a good water supply and above all it needs to be mined/dredged at a rate capable of delivering a return.

I'm still following but I still need a lot more convincing about this one.