Glen Cononish

It takes one tonne of rock to produce enough gold particles to fashion a wedding ring.

Blimey, that\’s a rich mine, no wonder they\’re so keen to get digging in a national park.

A more normal gold mine would be 1 gramme per tonne rock.

And unless you\’re at the very cheap end of the market a wedding ring is 5-10 grammes.

6 comments on “Glen Cononish

  1. There’s something seriously wrong with her figures anyway.
    Even at her ambitious yield 400,000 tons of spoil implies less than £140m. With your more realistic one £14m
    Sounds like someone’s dropped a zero somewhere but finding nothing of value in the Graun’s hardly a challenging task……

  2. A normal open cast gold mine would be 1-2 g/t perhaps, but a underground mine would have to be a lot nearer 10 g/t to be worth the effort and extra costs.

    On the value figures I think the clue is the precious metals part, I’d assume the miners will be going for more than just gold so those extra metals are probably what bumps the figure upto £170 million.

    Defending the Graun’s numbers, I never thought I’d be doing that!

  3. I just weighed my wedding ring. It is 4.36 grammes. My wife’s would be less yet. However it is 10K gold so there is only about 1.8 grammes of gold in it. So maybe a wedding ring per tonne is not far off. As I recall the set cost about $40 in 1972. And yes it was the cheap end of the market. That is is after all the largest end of most markets.

  4. 1-2 gramme/tonne is for oencast only.
    When I was young the cut-off point for extracting ore from South African mines was around 8 g/t (it varied from mine to mine,of course). I don’t have up-to-date figures but I expect that nowadays it is probably nearer 4 g/t.
    My wedding ring is about 8 gm (I don’t have jeweller’s scales) and 16 carat so just over 5 grams of gold – which means that 1 tonne per wedding ring sounds reasonable.

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