SECONDARY FOUNDRY OPERATIONS
Actual processing of raw ores and scrap metal for purification purposes is not common in San Diego County. Most "smelting" and "foundry" activities currently in San Diego County are actually melting and casting operations using relatively pure metal ingots. Local facilities employ relatively small crucible and pot furnaces to melt ingots prior to casting into dies and molds for small parts, tools, and plaques. Some particulates, alloy additives, flux, and trace metal contaminants from both the melting pot and the casting area are emitted into the air.