Presumably, "bronze" is only an approximate translation of {jey' Sorpuq}, and vice versa, as there are some forms of bronze which do not include tin (and, at least in theory, some copper-bronze alloys which are not bronzes).
A historically notable example is arsenical bronze. Arguably, translating "the Bronze Age" as {jey' Sorpuq bov} would be inaccurate, because it seems that arsenical bronze deserves nearly as much credit as tin bronze.

That being said, it could also be an example of a pars pro toto synecdoche, where something large (the set of all bronzes) is named for a particular example or subset (the set of tin bronzes).
https://en.wikipedia.org/wiki/Pars_pro_toto


________________________________________
From: tlhIngan-Hol <tlhingan-hol-bounces@lists.kli.org> on behalf of Steven Boozer <sboozer@uchicago.edu>
Sent: Tuesday, April 18, 2017 17:28
To: tlhingan-hol@kli.org
Subject: Re: [tlhIngan Hol] Klingon Word of the Day: jey' Sorpuq

> Klingon Word of the Day for Tuesday, April 18, 2017
>
> Klingon word: jey' Sorpuq
> Part of speech: noun
> Definition: bronze
> Source: qepHom 2016

jey'            tin (n)
Sorpuq                  copper (n)

COMPARE:
'uSqan                  iron (n)
  ghav 'uSqan    steel (n)
  velSo' 'uSqan  stainless steel (n)
ghav            carbon (n)
velSo'                  chromium (n)

SEE ALSO:
Qu                      cast (metal) (v)
QumeH ngaSwI'  mold (for casting) (n)
baS                    metal (n)


--
Voragh
tlhIngan ghantoH pIn'a'
Ca'Non Master of the Klingons


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