https://www.fireengineering.com/articles/print/volume-131/issue-6/features/metal-fires-require-knowledge-of-proper-extinguishing-agents.html
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Group IIA metal fires are best extinguished with powdered talc or with dry powders specially designed for the involved metal. These powders should be shoveled onto the fire until the metal fuel is completely blanketed. If the metal is burning on a combustible floor, it is best to spread a layer of extinguishing powder on a clear area, shovel the burning metal onto the powder, and then complete extinguishment by shoveling more powder onto the fire.