Spinks 2001 Pattern Auction Donald Are Golder "Dollars"

In this article they say different proportions were tried at the US mint, including ones slightly outside the patented limits. I couldn't find any info on Canadian patterns.

The density of gold is 19.32 g/cc, silver 10.50 g/cc, and copper 8.93 g/cc.

In the proportions indicated above, the density of goloid is 10.507 g/cc. As can be seen, goloid is only slightly more than half the density of gold.

The alloy may look like gold when freshly struck into a coin, but would tarnish or patinate over time, due to the high silver content. I do not think the patination rate would be retarded due to the presence of copper. Most of us know what sterling silver looks like when it is old.

Normally the admixture of about 5% by weight of aluminium is used to retain the gold colour of a copper alloy.

Aluminium when exposed to air is highly reactive, but always retains the clean metallic apperarance we all know of. The reason for this is that aluminium almost instantly develops a highly protective but very thin oxide coating on it's surface. That is why from a point of view of chemically stability, it is successful in the applications for which it is used. That is also why gold coloured aluminium bronze coins are successful.

Without ever seeing an old goloid object, I suspect that goloid would retain it's gold colour, but would appear patinated anyway.