Metalic Elements in oil

These are wear metals only except silicon.silicon is an abrasive and is coming from dirt and dust.All the other metals are a part of the engine metallurgy(metal alloy) and depends on the type of OEM,(CUMMINS,CAT,etc...).

Silicon can be from anti form agents also.Copper also can come from coolant ingress.

Judging from the question you don't know anything about internal combustion engines. I might suggest you do a little research on engines first so you can understand what the parts are in a engine, what they are made of and what their function is. After you have a basic understanding of the internals of a engine it might be easier to answer questions for you as to specifics of different wear metal combinations found in used oils analysis's.