RE:RE:RE:RE:RE:.27 GRAMS PER TON ?????SidelineSally wrote: ValuePro wrote:
Well, gosh, that's helpful, especially as I have not blocked you. Besides, and in so far as I know, I've only blocked out self-confessed milling contractor who changes his alias at least once per week. Can't say as I would trust a person who feels he has to behave that way but you are certainly welcome to feel otherwise.
Bonne chance,
Thats the guy, thats the guy. He needs to go on a chi break.
Here you go vp:
Densities of gravels vary widely generally ranging between about 1.4-2.1 tonnes per cubic metre. Sally
I use the following for Rock Density calculations:
https://geopixel.co.uk/lab3/Densities_of_Typical_Rock_Types_and_Minerals.pdf For Gravel ((which I apply to conglomerate in Novo's Purdy's Egina marine gravel case)
- range is 1.70 – 2.40 g/cubic cm (1.7 tonne - 2.4 tonne / cubic meter) ,
- average is 2.0 g/cubic cm (or 2 tonne / cubic meter)
For Sedimentary Rock (which I apply to conglomerate in Novo's Purdy's / Comet Well case)
- average is 2.5 g/cubic cm (or 2.5 tonne / cubic meter)
If you are mining ore by the cubic meter, you need to devide the volume of rock (and the gold extracted) by the density to arrive at the grade / tonne in grams (conventially used in the milling metrics).
Example for Gravel: a cubic meter of ore gravel mined would weigh 2 tonnes. If that cubic meter of ore contained 1 gram of gold, the actual grade per tonne would be 0.5 g/tonne or 0.016 oz/tonne
Notes:
- Novo will be mining hard rock conglomerate in Karratha. So in effect, the density of ore mined will be 2.5 tonnes / cubic meter. Subsequently, the oz/tonne grade figures also change as a result.
- Every additional process adds cost. Since the hard rock conglomerate at Karratha is not in a gravel form, a crushing operation must be applied prior to ore sorting if ore transporation costs to the Nullagine Mill are to be reduced.
- A troy ounce is the unit of measure used for weighing precious metals that dates back to the Middle Ages. Originally used in Troyes, France, one troy ounce is equal to 31.1034768 grams.
Or something like that ..... Lol
Tx