copper is kuraz

kuraz = copper (noun) (metal)
alternate spelling: kuhraz

Some things Google found for "kuraz":
Kuraz is a woreda (district) in the south of Ethiopia. Kuraz the Light Monarch is a Yu-Gi-Oh! card. Kuraz is an unusual last name.

Word derivation for "copper" :
Hungarian = réz
Finnish = kupari
Samgur = kuraz

silver is hespä

hespä = silver (noun) (metal)
alternate spelling: hespae

Some things Google found for "hespa":
Hespa is an unusual last name. Hespa is user names. In Icelandic hespa means skeins. In astronomy, similar Hesperus can refer to the planet Venus in its appearance as the evening star.

Word derivation for "silver" :
Hungarian = ezüst (which I transliterate to ezüsht)
Finnish = hopea
Samgur = hespä

I considered making this word hestä, but I decided to use the p from the Finnish word. To maintain vocal harmony, I changed the a to ä.

gold is aralt

aralt = gold (noun) (metal)

Some things Google found for "aralt":
Aralt is an uncommon masculine first name that can be Irish. Aralt is an unusual last name. Arult Inc. is a small business in Carnegie, PA.

Word derivation for "gold" :
Hungarian = arany
Finnish = kulta
Samgur = arult