Valmiki Ramayana Bala Kanda Sarga 37 Shloka 18

अस्या: from this river Ganaga, तप्तजाम्बूनदप्रभम् resembling the lustre of the molten gold, यत् that embryo, निर्गतम् emerging out of her, धरणीम् earth, प्राप्तम् having reached, तस्मात् from it, शुभम् auspicious, काञ्चनम् bright, अमलम् pure, हिरण्यम् gold (was produced).

The embryo that emerged from Ganga reached the earth. It resembled the lustre of molten gold. It furned into gold auspicious, bright and pure.