《天工开物·下篇·五金》
银矿铅的熔炼方法是：先从银铅矿中提取银，剩下的作为 炉底 ，再把 炉底 炼成铅。
凡银矿中铅，炼铅成底，炼底复成铅。
The method of smelting silver mine lead is: First extract silver from the lead ore, and the rest is used as the bottom of the furnace, and then the bottom of the furnace is smelted into lead.