OtusLotus wrote:I don't think that any of us will ever see a complete depletion of the copper pennies.. rather, I think we will see a depletion or withdaw of THE penny first!
I agree. I've read that estimates of total pennies currently in circulation are 140-200 billion. If we figure a conservative estimate of 20% copper based on our results, then there are about 30-40 billion copper pennies left. For figuring out how fast they are being removed, I referrenced another thread here where it was quoted from an article that brinks is pulling 3,000,000 coppers per day. That impies that they are sorting through about 3 billion total pennies per year and pulling 600 mil (if we assume 20%).
So in estimating total pulled per year, let's be conservative and assume that brinks and 2 or 3 of it's competitors are all pulling copper as well as all us hand sorters, meaning that in total, 15bil cents per year are being sorted for the purpose of removing copper. I ran those numbers on a spreadsheet and here are the results:
Total current pennies 140,000 (in millions)
Current percentage 20%
Total copper pennies- 2012 28,000 (in millions)
Total # sorted per year 15,000 (in millions)
Copper pulled* ending %* Copper left in circ
Year 1 3,000 18.25% 25,000
Year 2 2,737 16.58% 22,263
Year 3 2,487 15.01% 19,776
Year 4 2,251 13.53% 17,525
Year 5 2,029 12.15% 15,495
Year 6 1,823 10.88% 13,672
Year 7 1,632 9.71% 12,040
Year 8 1,456 8.63% 10,584
Year 9 1,295 7.66% 9,289
Year 10 1,149 6.78% 8,140
Here's a less conservative estimate, this is the most optimistic scenario I can forsee:
Total current pennies 200,000 (in millions)
Current percentage 25%
Total copper pennies- 2012 50,000 (in millions)
Total # sorted per year 10,000 (in millions)
Copper pulled* ending %* Copper left in circ
Year 1 2,500 24.05% 47,500
Year 2 2,405 23.11% 45,095
Year 3 2,311 22.19% 42,784
Year 4 2,219 21.29% 40,564
Year 5 2,129 20.40% 38,436
Year 6 2,040 19.53% 36,396
Year 7 1,953 18.67% 34,443
Year 8 1,867 17.84% 32,576
Year 9 1,784 17.03% 30,792
Year 10 1,703 16.24% 29,088
So basically, my belief is that 10 years from right now, our yields will still be somewhere between 6% and 16%. That is assuming that the penny is still around and that no new players enter the game (like the US gov beginning an Alloy Recovery Program like in Canada)
Reference (see tractorman's long quoted post about 4/5 of the way down page 1)
viewtopic.php?f=7&t=9826