Hi Nic,
I will try to post some photos (or scans) later, when I have some time. I estimate something between 3,000 and 4,000 coins. Average cost per coin is around 10¢, or so.
In similar size coins I have also found a Jamaica, 1966 5 shilling (Commonwealth Games) and eleven Eisenhower dollars.
Can I ask some silly questions re. the "Ikes"?

Is it normal for these to show a copper colour on the edge? I understand they are a copper core so, presumably, it will show at the edge.
Is there significance with different mintmarks? I have 1971 D mintmark, 1972 D, 1974 D, 1976 (Liberty Bell) with D and no mintmark (Philadelphia?) and 1978 D. Denver must be the common one. I intend to list the duplicates on eBay but don't want to inadvertently sell off a scarce one.
Also found, so far, several New Zealand, Fiji and New Guinea pre-decimals. Those I am interested in.
When I have finished sorting and identifying (and extracting what I am interested in) many will go on eBay in suitable sized lots for reasonable postage.
cheers
Jeff
"If you want to know what God thinks of money, look at the people He gives it to." Joe Moore