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how much does an unopened box of zincs weight. brinks & nf string boxes

The coins are 13.8 lbs. Add in a bit for paper or plastic wrappers, and cardboard.

13.8 for the zincs huh? What about a box of all Cu? And while we're at it what about a "typical" mixed box?

Thanks,
HoldingAg

HoldingAg wrote:13.8 for the zincs huh? What about a box of all Cu? And while we're at it what about a "typical" mixed box?

Thanks,
HoldingAg

A shade over 17 pounds (not counting the paper). 3.11 g x 2500 / 456.3 g/lb (use same equation for zincs except they weigh 2.5 g rather than 3.11 g).

Mixed is anything in between, depending on percentage. Multiply whatever you think your copper yield is by the difference (17-13.8 = 3.2) and add it to 13.8.

25% yield would be .25*3.2 = .8 added to 13.8 = 14.6 lb
50% yield would be 1.6+13.8=15.4 lb
75% yield would be 2.4+13.8=16.2 lb

68Camaro wrote:

HoldingAg wrote:13.8 for the zincs huh? What about a box of all Cu? And while we're at it what about a "typical" mixed box?

Thanks,
HoldingAg

A shade over 17 pounds (not counting the paper). 3.11 g x 2500 / 456.3 g/lb (use same equation for zincs except they weigh 2.5 g rather than 3.11 g).

Mixed is anything in between, depending on percentage. Multiply whatever you think your copper yield is by the difference (17-13.8 = 3.2) and add it to 13.8.

25% yield would be .25*3.2 = .8 added to 13.8 = 14.6 lb
50% yield would be 1.6+13.8=15.4 lb
75% yield would be 2.4+13.8=16.2 lb

thanks for the info, that'll be handy with my new scale

Depending on how accurate you want to be, if you want more precision, weigh 50 wrappers and a box by themselves, next time you get to an empty set. Add that weight to the above.

If you're concerned about wasting your time unwrapping an all zinc box, you can get a good idea of whether this is worth your while by weighing the whole box before you start. Also gives a good estimate of what your yield will be, if there is copper there.

I weigh my boxes (String) before opening for sorting. Right now they're coming in within an ounce or two of 15Lbs. and netting around 28% Cu.

ed_vantage17 wrote:I weigh my boxes (String) before opening for sorting. Right now they're coming in within an ounce or two of 15Lbs. and netting around 28% Cu.

Matches. 28% is just under 14.7 lbs per the formula above. Add in two-tenths for paper and you'd be at 14.9 lbs.

Would you guys mind sharing the make and model of the scales you guys are using?

gilpo wrote:Would you guys mind sharing the make and model of the scales you guys are using?

I have a WeighMax Digital Postal Scale. Weighs in 2/10 oz increments with a max of 75 Lbs. Got it on eBay.

LINKY

I forget the brand scale I use.. but it is very high end and accurate to 2 hundredths of a pound. I have rolled both solid boxes of zinc and solid boxes of copper cents. With paper and standard box the zinc box weighs 14.1 pounds and the copper box weighs 17.3 pounds. I imagine the plastic in a brinks box would be close to the weight of the paper so would expect the weights to be pretty close.