Do not trust the yard, it's a busy place and they usually don't have time to babysit. The answers are here. if you drop it all at once then they will pay you for the lowest denominator or usually steel/tin. (or what we call shred) Use a magnet and a grinder and you can figure out the different metals. Color can help. so can weight. You have to know what the basic metals are, some are too expensive for the manufacturers to use. If you have just a handful then save it up till you have enough to make it worthwhile.



http://igor.chudov.com/manuals/Spark...ery_Metals.pdf