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50, 20 & 10c obviously have different metal composition compared to a Gold Soverign. Gold doesn't corrode, some with high content silver, 3p, 6p etc were 97% silver behave similarly, till I think about 1945 when they went to 50% silver, they dont survive so well in the ground after this time...

There listed as scarce or hard to find and worth more than most other Threepences from what Ive read. http://tdkapdc.com.au/australian-threepence2c-1912.html

The 1912 Threepence is rare from what I've read.