Penultimate means second to last letter, not last letter. And Goldie wouldn't be right because it would be Golde.. The S group is a bit vague. But good grid, apart from the errors.

Just a bit Confused,but ok!

I enjoyed it. thanks.

As said by Mr Tips, that's not what penultimate means, you're better off saying that they have metals hidden at the start. Also would be nice if it accepted elements as well as metals, seeing as all of them are.

Good grid, would be nice if it accepted "quantities" "amounts" etc. for the "plenty" clue...on which point, Plenty means an abundance /more than enough/more than adequate etc. so not quite the same thing.
Enjoyable none the less :)

Tit is an interesting metal!

sorry I know I shouldn't be negative but errors like using the wrong word ie penultimate, and saying that the words in the plenty/adequate etc line all mean the same (they absolutely don't!!)......irritate me no end!! Please please check over. Make your grid great not half right!