I came across some interesting gopher-based archives. The first is
the Debian gopher mailing list archive that spans from 2007-2017
[0]. The next is the 'Gopherspace Wayback Machine' [1], basically a
browseable snapshot of the gopherspace in 2007. You can also
download the latter yourself from archive.org [2].

[0]: gopher://telefisk.org/1/mailarchives/gopher/
[1]: gopher://mozz.us/1/wayback
[2]: https://archive.org/details/2007-gopher-mirror