(1) Yahweh was worshiped by the Edomites, and especially by the Kenites, a small tribe regarded as the Canaanite smelters;
(2) the Israelite cult of Yahweh was associated with copper and with a bronze serpent, a typical symbol of metallurgy
(3) the melting of copper is considered in Exodus 4 as the specific sign of Yahweh. See https://www.ancient.eu/Yahweh/:
Scholar Nissim Amzallag, of Ben-Gurion University, disagrees with the claim that Yahweh’s origins are obscure and argues that the deity was originally a god of the forge and patron of metallurgists during the Bronze Age (c. 3500-1200 BCE). Amzallag specifically cites the ancient copper mines of the Timna Valley (in southern Israel), biblical and extra-biblical passages, and similarities of Yahweh to gods of metallurgy in other cultures for support.
ALTHOUGH THE BIBLE PRESENTS YAHWEH AS THE GOD OF THE ISRAELITES, THERE ARE MANY PASSAGES WHICH MAKE CLEAR THAT THIS DEITY WAS ALSO WORSHIPPED BY OTHER PEOPLES IN CANAAN.
Although the Bible, and specifically the Book of Exodus, presents Yahweh as the god of the Israelites, there are many passages which make clear that this deity was also worshipped by other peoples in Canaan. Amzallag notes that the Edomites, Kenites, Moabites, and Midianites all worshipped Yahweh to one degree or another and that there is evidence the Edomites who operated the mines at Timnah converted an earlier Egyptian temple of Hathor to the worship of Yahweh.
Although the biblical narratives depict Yahweh as the sole creator god, lord of the universe, and god of the Israelites especially, initially he seems to have been Canaanite in origin and subordinate to the supreme god El. Canaanite inscriptions mention a lesser god Yahweh and even the biblical Book of Deuteronomy stipulates that “the Most High, El, gave to the nations their inheritance” and that “Yahweh’s portion is his people, Jacob and his allotted heritage” (32:8-9). A passage like this reflects the early beliefs of the Canaanites and Israelites in polytheism or, more accurately, henotheism (the belief in many gods with a focus on a single supreme deity). The claim that Israel always only acknowledged one god is a later belief cast back on the early days of Israel’s development in Canaan.