Are these all of them?

USA-Eagle
Canada-Maple Leaf
UK-Britania
Australia-Kookaburra
Mexico-Libertad
China-Panda

Australia also does Kangaroos, Koalas, Lunar ....I think that's all.

Add Austria. And curiously I have one from Mongolia also.

Forgot:

South Africa-Krugerand

Isle of Man - Angel

Over the years the Netherlands has issued gold ducats and (my favorite) double ducats at slightly above spot price.

Slightly being a relative term. The quality though is pretty amazing.

The nice thing about the Dutch ducats is you can likely collect them over a period of 400 years. Being .986 fine, they were one of the finest gold coins available for quite some time.

Austria
Krugerrand

I do not know what your definition of Bullion Coin is but Britannia and Wiener Philharmoniker are 8 - 12 % premium Bullion Coins in Europe
The new American Bufalo is 12 %
Mexico Libertad is not seen
Kurgerrand-Maple-Nugget-New Eagle are exactly at goldprice but so are 20 Francs from Belgium, France,Switzerland, 10 Fl holland and the sovereign
some so called investor coins go for melt or less ; many 100 canadian dollar commems do not get melt price and yet they are supposed to be not Bullion Coins but for me they are
4 Ducats from Austria restrike nearly allways goes below melt ( you know those big wafer thin coins)

I got this investor coin 14% below melt on ebay France

4 Ducats

To stay below 100 K I had to upload the reverse separately

I'm loving the ducats.

The ducats are too small to me and those 4 ducats are the only modern coins you can bent by hand
I love my double ducat proof restrike though