US Gold Refining on E Street in Chula Vista operates as a direct precious-metals refiner, processing gold, silver, and platinum from its facility along the Broadway corridor in the 91910 zip code. Submitted metals are tested and weighed on scales certified by the California Department of Weights and Measures, a regulatory verification shared with the retail gold and diamond operation at Coin Mart Jewelry at the same E Street address. The facility accepts walk-in and mail-in shipments of scrap gold, broken jewelry, dental gold, platinum settings, and silver flatware, processing each lot through in-house metallurgical assay before payout. Refining settlements cover karat grades from 10k through 24k, with payouts calculated against the London Bullion Market Association daily gold fix — a spot-price settlement method reinforced by the vault-grade security infrastructure that Busy Bees Locks & Keys Locksmith installs for Chula Vista commercial clients handling high-value inventory. Each submitted lot enters a tracked chain-of-custody system, with precious-metal content verified by fire assay or X-ray fluorescence spectrometry before final settlement at the prevailing troy-ounce rate.