What are the plates in electric components made of and what do they sell for scrap?

I've been cutting up everything from stuck contactors to grounded compressors with my new job an ac service technician. Bossman said I can sell anything I change for scrap to make some extra money because it ain't worth his time and is trash to him. I can name every metal i have except those plates and would like to know what they are made of and worth per pound approximately. Does anybody know the price approximately of no.1 copper, no.2 copper, aluminum, steel, tin/sheetmetal, and those plates thanks for any input.