Tape head readers - gold?

At the moment I only have regular tape heads (no large vcrs).
I've read they have a sliver of gold inside?
I do not mind spending the time breaking open.
https://c5.staticflickr.com/1/272/30...28fda57f9a.jpg

I have not heard that's there's Gold in a tape head reader before, ever.

But since there's almost a sliver of truth in something, I think the reference might be to there possibly being a sliver of Gold in a Hard drives readers arm. On the little mylar band that runs from the pivot to the actual head.

This is a pic from a YouTube, I don't know how much truth there is in it though.
https://encrypted-tbn3.gstatic.com/i...ucwj70GRxzcDmi

While I'm on the subject, there's something similar looking on the brown mylar on the boxy looking ink jet cartridges, HP's.
When I have melted some of it, the tracks come off the plastic and while some have the Copper track as a backing, some look like they are a solid Gold track. YMMV.

While looking for a pic, I found this pic.

https://encrypted-tbn2.gstatic.com/i...peYF0qsdMosfmQ

Opened it up.
Inside the metal housing was a thin copper plate, surrounded by several thin Alumium plates meshed together.
This was all encased in a kind of pewter; Is pewter non conductive?
I suspect the copper plate was silver plated(very slightly) on the read edge, you can see it in the photo (thin line in centre).

I'd love to inspect a high quality stereo system or VCR though.